We show that the frequency spectrum of two-dimensional photonic crystals is strongly influenced by Fano resonances which can be excited already in the linear array of dielectric cylinders. To support this claim, we calculate the transmission of an electromagnetic wave through a linear array of diele…

[Phys. Rev. A 92, 043814] Published Mon Oct 12, 2015

The outstanding progress in nanostructure fabrication and cooling technologies allows what was unthinkable a few decades ago: bringing single-mode mechanical vibrations to the quantum regime. The coupling between photon and phonon excitations is a natural source of nonclassical states of light and m…

[Phys. Rev. A 92, 043812] Published Mon Oct 12, 2015

A giant field enhancement factor, defined as the ratio between the intensity of the resonant and the incident fields, is achievable in a photonic crystal (PhC) slab realized in a low contrast dielectric medium. The key point is the careful control of some parameters, first among all the slab thickne…

[Phys. Rev. B 92, 155117] Published Mon Oct 12, 2015

Entangled states of spin orientation and directional photons could be created by carefully placing of a quantum dot in a photonic crystal waveguide.

[Phys. Rev. Lett. 115, 153901] Published Tue Oct 06, 2015

An optical-fiber scheme generates a bright “twin beam”—a pair of quantum-correlated beams that could be used in high-precision metrology.

[Phys. Rev. Lett. 115, 143602] Published Wed Sep 30, 2015

We report on the generation of a three-octave-wide supercontinuum extending from the vacuum ultraviolet (VUV) to the near infrared, spanning at least 113–1000 nm (i.e., $11-1.2\mathrm{eV}$ ), in He-filled hollow-core kagome-style photonic crystal fiber. Numerical simulations confirm that the main mechanism is …

[Phys. Rev. A 92, 033821] Published Mon Sep 14, 2015

Quantum dots embedded in photonics nanostructures provide unprecedented control over the interaction between light and matter. This review gives an overview of the theoretical principles involved, as well as applications ranging from high-precision quantum electrodynamics experiments to quantum-information processing.

[Rev. Mod. Phys. 87, 347] Published Mon May 11, 2015

We introduce topological defects to a square lattice of elliptical cylinders. Despite the broken translational symmetry, the long-range positional order of the cylinders leads to a residual photonic band gap in the local density of optical states. However, the band-edge modes are strongly modified b…

[Phys. Rev. A 91, 023811] Published Fri Feb 06, 2015

Improving photoluminescence or nonlinear wavelength conversion is an important goal in engineering a wide variety of systems in optics, photonics, and nanoscience. To this end, it is challenging to design doubly resonant nanocavities that match a specific pair of wavelengths, as cavity modes are usually not independently tunable. The authors demonstrate flexible tuning of double resonances, and utilize guided-mode resonances localized at defects in photonic crystals to increase photoluminescence intensity by a factor of 2400.

[Phys. Rev. Applied 3, 014006] Published Wed Jan 21, 2015

We study a hybrid system consisting of a narrow-band atomic optical resonance and the long-range periodic order of an opaline photonic nanostructure. To this end, we have infiltrated atomic cesium vapor in a thin silica opal photonic crystal. With increasing temperature, the frequencies of the opal'…

[Phys. Rev. B 91, 045123] Published Tue Jan 20, 2015

We obtained a propagation equation for an optical pulse at an electromagnetically induced transparency window guided on a gas-filled hollow-core photonic crystal fiber. This equation admits dissipative solitons whose analytical expression was also obtained. Depending on the parameter region, they ma…

[Phys. Rev. A 91, 013828] Published Tue Jan 20, 2015

Hyperuniform disordered materials are a class of photonic solids with a constrained randomness that have short-range order and long-range statistical isotropy. In these materials, calculations suggest a new type of high-Q localization mechanism in optical cavities, that has no analogue in periodic or quasi-periodic photonic crystals.

[Phys. Rev. B 91, 020201(R)] Published Tue Jan 20, 2015

We determined experimentally the eigenvalues of two rectangular quantum billiards that contain circular scatterers forming a triangular grid, so-called Dirac billiards. For this we performed measurements of unprecedented accuracy using superconducting macroscopic-size microwave billiards that enclos…

[Phys. Rev. B 91, 035411] Published Mon Jan 12, 2015

The interactions between plasmonic and photonic modes of a cavity-coupled plasmonic crystal are studied in diffraction and diffractionless regimes, which lead us to the understanding of coherent interactions between electron plasma, higher order cavity, and diffraction modes. The strong interaction …

[Phys. Rev. Lett. 113, 263902] Published Mon Dec 29, 2014

A design for a photonic crystal made with so-called hyperbolic metamaterials could provide unprecedented control of light waves confined to the surface.

[Phys. Rev. X 4, 041014] Published Mon Oct 27, 2014

We study the mutual interaction between two identical quantum dots coupled to the normal modes of two-site photonic crystal molecules in a planar waveguide geometry, i.e., photonic crystal dimers. We find that the radiative coupling between the two quantum emitters is maximized when they are in reso…

[Phys. Rev. B 90, 155436] Published Tue Oct 21, 2014

We suggest and analyze a laser with a mirror realized by Fano interference between a waveguide and a nanocavity. For small-amplitude modulation of the nanocavity resonance, the laser can be modulated at frequencies exceeding 1 THz, not being limited by carrier dynamics as for conventional lasers. Fo…

[Phys. Rev. Lett. 113, 163901] Published Wed Oct 15, 2014

We present a derivation that maps the original problem of a many-body open quantum system (OQS) coupled to a harmonic oscillator reservoir into that of a many-body OQS coupled to a lattice of harmonic oscillators. The present method is particularly suitable to analyze the dynamics of atoms arranged …

[Phys. Rev. A 90, 043806] Published Tue Oct 07, 2014

We demonstrate a single-photon collection efficiency of $(44.3\pm 2.1)\%$ from a quantum dot in a low-Q mode of a photonic-crystal cavity with a single-photon purity of $g^{\left(2\right)}\left(0\right)=(4\pm 5)\%$ recorded above the saturation power. The high efficiency is directly confirmed by detecting up to $962\pm 46$ kilocounts per se…

[Phys. Rev. B 90, 155303] Published Mon Oct 06, 2014

We propose a realistic protocol for the preparation and readout of mechanical Bell states in an optomechanical system. The proposal relies on parameters characterizing a photonic crystal cavity mode, coupled to two localized flexural modes of the structure, but equally applies to other optomechanica…

[Phys. Rev. Lett. 113, 143603] Published Tue Sep 30, 2014

Spontaneous emission from a cavity made of an optical nanofiber and a nanostructured grating is demonstrated, which would allow single quantum emitters to be easily integrated into an optical network.

[Phys. Rev. Lett. 113, 143601] Published Mon Sep 29, 2014

We explore the dynamics and directionality of spontaneous emission from self-assembled In(Ga)As quantum dots into transverse-electric–polarized guided modes in GaAs two-dimensional photonic-crystal waveguides. The local group velocity of the guided waveguide mode is probed, with values as low as $\sim \mathrm{1.\dots }$

[Phys. Rev. B 90, 115310] Published Wed Sep 24, 2014

We have studied spectral properties of a cholesteric liquid crystal with a combined defect consisting of a nanocomposite layer and a twist. The nanocomposite layer is made of metallic nanoballs dispersed in a transparent matrix and featuring effective resonant permittivity. A solution has been found…

[Phys. Rev. E 90, 032505] Published Wed Sep 24, 2014

We theoretically investigate the design of cavities in a three-dimensional (3D) inverse woodpile photonic crystal. This class of cubic diamondlike crystals has a very broad photonic band gap and consists of two perpendicular arrays of pores with a rectangular structure. The point defect that acts as…

[Phys. Rev. B 90, 115140] Published Tue Sep 23, 2014

The transition between the long-wavelength and the short-wavelength regimes of light propagation in two-dimensional graded photonic crystal is investigated using a hyperspectral near-field scanning microscope. The experiments show an invariant quantity of only 1.78 times the lattice period as the cr…

[Phys. Rev. B 88, 125138] Published Fri Sep 27, 2013

We study the effects of finite size and of vacancies on the photonic band gap recently predicted for an atomic diamond lattice. Close to a $J_g=0\to J_e=1$ atomic transition, and for atomic lattices containing up to $N\approx 3\times {10}^4$ atoms, we show how the density of states can be affected by both the shape of the s…

[Phys. Rev. A 88, 033844] Published Wed Sep 25, 2013

We report on the occurrence and properties of photonic surface states in periodic structures of magnetized plasma nanospheres by means of rigorous calculations using the full-electrodynamic layer-multiple-scattering method, properly extended to treat gyrotropic spheres with arbitrarily oriented gyra…

[Phys. Rev. B 88, 125133] Published Mon Sep 23, 2013

The efficient manipulation with optical spectra of colloidal photonic crystals was achieved using the metal mirror positioned either immediately or at a distance from the crystal surface. If the mirror is close to the surface, the changes are mostly quantitative and relate to the improved light conf…

[Phys. Rev. B 88, 125418] Published Fri Sep 13, 2013

Ground-plane cloaks, which transform a curved mirror into a flat one, and recently reported at wavelengths ranging from the optical to the visible spectrum, bring the realm of optical illusion a step closer to reality. However, all carpet-cloaking experiments have thus far been carried out in the fa…

[Phys. Rev. B 88, 115110] Published Fri Sep 06, 2013

We show both analytically and numerically that there is an infinite number of flat bands with different Chern numbers in a two-dimensional magnetic photonic crystal at nearly the same frequency determined by the condition that the effective magnetic permeability ${\mu }_{\text{eff}}\approx -1$. This opens the door to explo…

[Phys. Rev. E 88, 031201(R)] Published Thu Sep 05, 2013

We consider a photonic crystal fiber resonator pumped by a coherent injected beam. We show that temporal cavity solitons exhibit a motion with a constant velocity. This regular drift is induced by a broken reflection symmetry mediated by a third-order dispersion. We focus the analysis on dark tempor…

[Phys. Rev. A 88, 035802] Published Wed Sep 04, 2013

Modulational instability (MI) of 500 fs, $5\mu \mathrm{J}$ pulses, propagating in gas-filled hollow-core kagome photonic crystal fiber, is studied numerically and experimentally. By tuning the pressure and launched energy, we control the duration of the pulses emerging as a consequence of MI and hence are able …

[Phys. Rev. Lett. 111, 033902] Published Fri Jul 19, 2013

Strong cross-Kerr nonlinearities have been long sought after for quantum information applications. Recent work has shown that they are intrinsically unreliable in traveling-wave configurations: cavity configurations avoid this, but require knowledge of both the nonlinearity and the loss. Here we pre…

[Phys. Rev. A 88, 013819] Published Mon Jul 15, 2013

An integrated realization of photonic entangled states becomes an inevitable tendency toward integrated quantum optics. Here we report the compact engineering of steerable photonic path-entangled states from a monolithic quadratic nonlinear photonic crystal. The crystal acts as a coherent beam split…

[Phys. Rev. Lett. 111, 023603] Published Fri Jul 12, 2013

We report a study of single quantum dots inside photonic crystal cavities with a low-temperature scanning near-field optical microscope. The spatial maps of single excitonic lines from the quantum dot show the clear signature of coupling to the cavity modes for small detunings. We also show that the…

[Phys. Rev. B 88, 035416] Published Wed Jul 10, 2013

We explore the optical properties of periodic layered media containing left-handed metamaterials. This study is based on several analogies between the propagation of light in metamaterials and charge transport in graphene. We derive the conditions when these two problems become equivalent, i.e., the…

[Phys. Rev. B 87, 245134] Published Fri Jun 28, 2013

In light of the interest in the transport of single photons in arrays of waveguides, fiber couplers, photonic crystals, etc., we consider the quantum mechanical process of the tunneling of photons through evanescently or otherwise coupled structures. We specifically examine the issue of tunneling be…

[Phys. Rev. A 87, 063841] Published Mon Jun 24, 2013

The dynamical theory of x-ray diffraction and the coupled-wave theory for modeling diffraction of light from periodic structures are two equivalent theories but with incompatibilities, as they were developed independently along two parallel directions in history. Here we reformulate the two theories…

[Phys. Rev. A 87, 063828] Published Tue Jun 18, 2013

In this article, we investigate the spontaneous emission properties of radiating molecules embedded in a chiral nematic liquid crystal, under the assumption that the electronic transition frequency is close to the photonic edge mode of the structure, i.e., at resonance. We take into account the tran…

[Phys. Rev. E 87, 062504] Published Mon Jun 17, 2013

We found the self-similar solitary solutions of a recently proposed model for the propagation of pulses in gas-filled hollow-core photonic crystal fibers that includes a plasma induced nonlinearity. As anticipated for a simpler model and using a perturbation analysis, there are indeed stationary sol…

[Phys. Rev. A 87, 063803] Published Mon Jun 03, 2013

We develop a local coupling theory to simultaneously treat the weak and strong interaction between a quantum emitter and photons in arbitrary nanostructures. The local coupling strength proportional to the projected local density of states (PLDOS) for photons is determined by a flexible and efficien…

[Phys. Rev. B 87, 195138] Published Tue May 28, 2013

We theoretically investigate the propagation of a paraxial beam in two-dimensional media with spatial dispersion. Based on the spatial dispersion theory and the ($1+1$)-dimensional paraxial wave equation, we get an expression which determines the diffraction of the beam. By fitting the dispersion surf…

[Phys. Rev. A 87, 053827] Published Wed May 22, 2013

We predict the existence of a new class of self-accelerating, exponentially localized pulses consisting of two interacting frequency components propagating at opposite group velocity dispersion. Compared to previous approaches no external force is required and accelerations of both signs can be real…

[Phys. Rev. Lett. 110, 193901] Published Wed May 08, 2013

In photonic crystal (PC) gratings whose structural symmetry is broken owing to one-side corrugations, the Rayleigh-Wood anomalies can appear in a one-way manner. In the combination with the vanishing coupling to the lowest Floquet-Bloch mode at the upper band edge, these anomalies lead to the appear…

[Phys. Rev. A 87, 053804] Published Fri May 03, 2013

We propose a scheme to achieve controllable self-pulsing operation in a semiconductor photonic-crystal nanolaser. The scheme is based on coupling two asymmetric nanocavities and pumping only one of them. As a result, either periodic or chaotic subnanosecond $Q$-switched pulses can emerge. A coupled-mo…

[Phys. Rev. A 87, 041804(R)] Published Tue Apr 30, 2013

We show a technique that images the intensity distribution and local state of polarization of the optical field of high-quality factor optical modes confined in dielectric planar photonic crystal nanocavities. Based on energy-loss spectroscopy of swift electrons, the technique gives a spatial resolu…

[Phys. Rev. B 87, 155314] Published Mon Apr 29, 2013

Back focal plane imaging microscopy of the autofluorescence of a colloidal photonic crystal at fixed wavelength is used to visualize photonic stop bands. Emission angles of up to ${74}^{\circ }$ against the crystals surface normal are detected. Structure and orientation of the crystal lattice, quality of the or…

[Phys. Rev. B 87, 165438] Published Mon Apr 29, 2013

Ultra-high-quality factor photonic crystal nanocavities are attracting much attention because they can confine light into an ultra-small region and enable strong interaction between light and matter. One important step toward the realization of quantum information processing with cavity quantum elec…

[Phys. Rev. B 87, 165138] Published Mon Apr 29, 2013

A method is suggested for the fabrication of three-dimensional photonic crystals operating in the visible by rolling patterned prestressed membranes. A variety of architectures accessible using this fabrication scheme, including $\langle 111\rangle$ and $\langle 100\rangle$ diamond structures, were theoretically examined and opt…

[Phys. Rev. A 87, 041803(R)] Published Thu Apr 18, 2013

Through periodic index modulation, we create two different types of photonic structures in a heated rubidium vapor for controlled reflection, transmission, and diffraction of light. The modulation is achieved through the use of the ac Stark effect resulting from a standing-wave control field. The pe…

[Phys. Rev. A 87, 043815] Published Mon Apr 15, 2013

We perform an experimental time-domain mapping of nonlinear pulse propagation through a two-dimensional photonic-crystal waveguide. Our optical gating method allows for the complete reconstruction of the peculiar propagation behavior in this highly dispersive structure. Temporal soliton formation is…

[Phys. Rev. A 87, 041802(R)] Published Fri Apr 12, 2013

We propose an optical trapping technique in which a fundamental soliton traps an ultrashort small amplitude radiation in a symmetric hollow-core photonic crystal fiber filled with a noble gas, preventing its dispersion. The system is Raman- and plasma-free. Trapping is due to the cross phase modulat…

[Phys. Rev. A 87, 043807] Published Mon Apr 08, 2013

In this Letter we show that, in spectral regions where there are no orbital cladding resonances to cause transmission loss, the core mode of a continuously twisted photonic crystal fiber (PCF) exhibits optical activity, and that the magnitude of the associated circular birefringence increases linear…

[Phys. Rev. Lett. 110, 143903] Published Thu Apr 04, 2013

We demonstrate the existence of the spectral phase shift a pulse experiences when it is subjected to spectral focusing. This $\frac{\pi }{2}$ phase shift is the spectral analog of the Gouy phase shift a 2D beam experiences when it crosses its focal plane. This spectral Gouy phase shift is measured using spectral …

[Phys. Rev. Lett. 110, 143902] Published Wed Apr 03, 2013

Transmission spectra and rotation of the plane of polarization of light were measured on perfect samples of cholesteric liquid crystal. We found peculiarities of the spectral dependence of rotation of the plane of polarization related to Pendellösung oscillations that were predicted theoretically bu…

[Phys. Rev. E 87, 032506] Published Fri Mar 29, 2013

The optomechanical coupling between a resonant optical field and a nanoparticle through trapping forces is demonstrated. Resonant optical trapping, when achieved in a hollow photonic crystal cavity is accompanied by cavity backaction effects that result from two mechanisms. First, the effect of the …

[Phys. Rev. Lett. 110, 123601] Published Wed Mar 20, 2013

A detailed and rigorous theoretical investigation of the optical properties of a generic three-dimensional chiral structure of plasma spheres, without and under the action of an external static uniform magnetic field, is presented. Corresponding photonic band diagrams in conjunction with relevant tr…

[Phys. Rev. B 87, 115125] Published Wed Mar 20, 2013

We present a comprehensive experimental and theoretical study of visible light diffraction from opal-based photonic structures of different dimensions. We also developed new methodological approaches to collection, processing, and interpretation of experimental diffraction data. The key idea is to a…

[Phys. Rev. B 87, 125131] Published Tue Mar 19, 2013

The spontaneous emission of a two-level atom in a anisotropic photonic crystal is investigated without making use of the rotating wave approximation (RWA). Similar to the RWA case, there exist two characteristic atomic transition frequencies which separate the radiation field from the localized and …

[Phys. Rev. A 87, 033818] Published Fri Mar 15, 2013

We show that a generalized asymmetric resonant line shape derived elsewhere from rigorous electromagnetic calculations [Gallinet and Martin, Phys. Rev. B 83, 235427 (2011)] and from the two-oscillators model [Joe et al., Phys. Scr. 74, 259 (2006)] can also be obtained using a very general assumptio…

[Phys. Rev. B 87, 125118] Published Wed Mar 13, 2013

We show, theoretically and experimentally, that chirped photonic crystals (where the longitudinal modulation period varies along the propagation direction) can provide a substantial spatial (angular) filtering of light beams. The chirped photonic crystals, in gapless configuration, were recorded in …

[Phys. Rev. A 87, 033805] Published Mon Mar 11, 2013

We revisit the process of optical wave thermalization through supercontinuum generation in photonic crystal fibers. We report theoretically and numerically a phenomenon of `truncated thermalization': The incoherent optical wave exhibits an irreversible evolution toward a Rayleigh-Jeans thermodynamic…

[Phys. Rev. A 87, 035803] Published Mon Mar 11, 2013

We derive a general formalism to model the polariton states resulting from the radiation-matter interaction between an arbitrary number of excitonic transitions in semiconductor quantum dots and photon modes in a photonic crystal structure in which the quantum dots are embedded. The Maxwell equation…

[Phys. Rev. B 87, 125306] Published Mon Mar 11, 2013

A new mechanism for the generation of efficient zero phase delay of electromagnetic wave propagation based on wavefront modulation is investigated in this paper. Both numerical simulations and experiments have demonstrated the zero phase delay behaviors of wave propagation in a two-dimensional trian…

[Phys. Rev. B 87, 125107] Published Wed Mar 06, 2013

We report on the dual nature (capacitive and inductive) of the surface impedance of periodic graphene patches at low-terahertz frequencies. The transmission spectra of a graphene-dielectric stack shows that patterned graphene exhibits both the low-frequency (capacitive) passband of metal patch array…

[Phys. Rev. B 87, 115401] Published Mon Mar 04, 2013

We use a rigorous electromagnetic approach to show the existence of strongly localized modes in the stop band of a linear, two-dimensional, finite photonic crystal near its Dirac point. At normal incidence, the crystal exhibits a Dirac point with 100$\%$ transmission. At angles slightly off the normal,…

[Phys. Rev. B 87, 085135] Published Tue Feb 26, 2013

Optical diodes controlling the flow of light are of principal significance for optical information processing. They transmit light from an input to an output, but not in the reverse direction. This breaking of time reversal symmetry is conventionally achieved via Faraday or nonlinear effects. For ap…

[Phys. Rev. Lett. 110, 093901] Published Mon Feb 25, 2013

This article reviews recent theoretical and experimental advances in the fundamental understanding and active control of quantum fluids of light in nonlinear optical systems. In the presence of effective photon-photon interactions induced by the optical nonlinearity of the medium, a many-photon syst…

[Rev. Mod. Phys. 85, 299] Published Thu Feb 21, 2013

With the aim of furthering the explanation of iridescence in Morpho butterflies, we developed an optical model based on the finite-element (FE) method, taking more accurately into account the exact morphology of the wing, origin of iridescence. We modeled the photonic structure of a basal scale of t…

[Phys. Rev. E 87, 022705] Published Wed Feb 13, 2013

We investigate the non-Markovian dynamics of quantum correlation between two initially entangled nitrogen-vacancy centers (NVCs) embedded in photonic-crystal cavities (PCCs). We find that a finite quantum correlation is preserved even asymptotically when the transition frequency of the NVC is within…

[Phys. Rev. A 87, 022312] Published Wed Feb 13, 2013

We present the theoretical analysis and computer simulation of the wakefields in a 17 GHz photonic band-gap (PBG) structure for accelerator applications. Using the commercial code CST Particle Studio, the fundamental accelerating mode and dipole modes are excited by passing an 18 MeV electron beam t…

[Phys. Rev. ST Accel. Beams 16, 022002] Published Mon Feb 11, 2013

[Phys. Rev. B 87, 079903] Published Mon Feb 04, 2013

We demonstrate ultrafast delay tuning of a slow-light pulse with a response time $<10\mathrm{ps}$. This is achieved using two types of slow light: dispersion-compensated slow light for the signal pulse, and low-dispersion slow light to enhance nonlinear effects of the control pulse. These two types of slo…

[Phys. Rev. Lett. 110, 053902] Published Wed Jan 30, 2013

An improved single-cell photonic band-gap (PBG) structure with an inner row of elliptical rods (PBG-E) was tested with high power at a 60 Hz repetition rate at X-band (11.424 GHz), achieving a gradient of $128\mathrm{MV}/\mathrm{m}$ at a breakdown probability of $3.6\times {10}^{-3}$ per pulse per meter at a pulse length of 150 n…

[Phys. Rev. ST Accel. Beams 16, 012005] Published Tue Jan 29, 2013

Employing a recently developed method that is numerically accurate within a model space simulating the real-time dynamics of few-body systems interacting with macroscopic environmental quantum fields, we analyze the full dynamics of an atomic system coupled to a continuum light field with a gapped s…

[Phys. Rev. A 87, 013428] Published Thu Jan 24, 2013

We investigate the light wave states in the octagonal and decagonal quasiperiodic metallic structures by considering their respective approximants at different orders. The mechanisms underlying the light wave behaviors are studied in relation to various structure parameters and configurations. We sh…

[Phys. Rev. B 86, 235110] Published Mon Dec 10, 2012

We investigate light transport near the band edge of slow-light photonic-crystal waveguides using phase-sensitive near-field microscopy. We obtain and interpret high-resolution band structures, allowing the retrieval of the optical density of states for a one-dimensional periodic system with weak in…

[Phys. Rev. B 86, 155154] Published Fri Oct 26, 2012

We measure the time-energy correlation of broadband, spontaneously seeded four-wave mixing (FWM), and demonstrate time-frequency coupling effects; specifically, we observe a power-dependent splitting of the correlation in both energy and time. By pumping a photonic crystal fiber with narrowband pico…

[Phys. Rev. A 86, 043837] Published Fri Oct 26, 2012

We measure the spatial extent of individual photonic states that are localized by residual disorder in a slow-light photonic crystal waveguide. The size of the states is measured by locally perturbing them individually through an electromagnetic interaction with a near-field probe. We identify local…

[Phys. Rev. B 86, 155153] Published Fri Oct 26, 2012

Self-assembled artificial opals (in particular silica opals) constitute a model system to study the optical properties of three-dimensional photonic crystals. The silica optical index is a key parameter to correctly describe an opal but is difficult to measure at the submicrometer scale and usually …

[Phys. Rev. B 86, 165432] Published Fri Oct 19, 2012

We show that a model based on anticrossing between highly group velocity-mismatched gap-guided and index-guided modes describes gap soliton propagation in photonic crystal waveguides. Such nonlinear solutions can be exploited for exploring new regimes such as all-optical control of group velocity (d…

[Phys. Rev. Lett. 109, 163902] Published Thu Oct 18, 2012

We report the results of the recent high power testing of superconducting radio frequency photonic band gap (PBG) accelerator cells. Tests of the two single-cell 2.1 GHz cavities were performed at both 4 and 2 K. An accelerating gradient of $15\mathrm{MV}/\mathrm{m}$ and an unloaded quality factor $Q_0$ of $4\times {10}^9$ were ac…

[Phys. Rev. Lett. 109, 164801] Published Wed Oct 17, 2012

The electronic ground state of a periodic system is usually described in terms of extended Bloch orbitals, but an alternative representation in terms of localized “Wannier functions” was introduced by Gregory Wannier in 1937. The connection between the Bloch and Wannier representations is realized b…

[Rev. Mod. Phys. 84, 1419] Published Wed Oct 10, 2012

We study theoretically the dipole-dipole interaction and energy transfer in a hybrid system consisting of a quantum dot and graphene nanodisk embedded in a nonlinear photonic crystal. In our model, a probe laser field is applied to measure the energy transfer between the quantum dot and graphene nan…

[Phys. Rev. B 86, 125452] Published Fri Sep 28, 2012

We demonstrate an all-organic, one-dimensional photonic crystal tuned to the regime of strong exciton-photon coupling. The structure consists of a high index of refraction light-absorbing active layer periodically distributed in a low index of refraction nonabsorbing background medium. The strongly …

[Phys. Rev. Lett. 109, 096401] Published Mon Aug 27, 2012

Fano resonance spectroscopy (FRS) is used to investigate the photonic resonance properties of the defect states in two-dimensional finite-sized photonic crystals (PCs). This study examines the scattering cross-section spectra by changing the direction of the incident light continuously. The present …

[Phys. Rev. A 85, 063818] Published Mon Jun 18, 2012

Optical solitons or solitonlike states shed light to blueshifted frequencies through a resonant emission process. We predict a mechanism by which a second propagating mode is generated. This mode, called negative resonant radiation, originates from the coupling of the soliton mode to the negative-fr…

[Phys. Rev. Lett. 108, 253901] Published Mon Jun 18, 2012

We find that electromagnetic waves can be guided at the edge of a three-dimensional photonic crystal in air. When the waveguide is defined by the intersection of two surface planes, the edge modes are associated with the corresponding surface bands. A simple cell counting approach is presented to de…

[Phys. Rev. Lett. 108, 243901] Published Tue Jun 12, 2012

We report the observation of nonlinear interactions in quadratic nonlinear crystals having a geometrically twisted susceptibility pattern. The quasi-angular-momentum of these crystals is imprinted on the interacting photons during the nonlinear process so that the total angular momentum is conserved…

[Phys. Rev. Lett. 108, 233902] Published Fri Jun 08, 2012

Here, we report on the transmissivity of electromagnetic waves through a stack of monolayer graphene sheets separated by dielectric slabs at low-terahertz frequencies. It is observed that the multilayer structure possesses band-gap properties and supports a series of bandpass and band-stop regions, …

[Phys. Rev. B 85, 245407] Published Tue Jun 05, 2012

We develop an efficient method to derive a class of surface states in photonic superlattices. In a kind of infinite bichromatic superlattice satisfying some specific conditions, we obtain a finite portion of their in-gap states, which are superpositions of finite numbers of their unstable Bloch wave…

[Phys. Rev. A 85, 063802] Published Mon Jun 04, 2012

We demonstrate fast nonlinear optical switching between two laser pulses with as few as 140 photons of pulse energy by utilizing strong coupling between a single quantum dot (QD) and a photonic crystal cavity. The cavity-QD coupling is modified by a detuned pump pulse, resulting in a modulation of t…

[Phys. Rev. Lett. 108, 227402] Published Wed May 30, 2012

We theoretically show that six-partite continuous-variable entanglement can be generated by nonlinear optical processes conducted in a designed photonic crystal-like periodically poled lithium niobat (PPLN). The processes consist of a nonlinear parametric down-conversion and four sum-frequency proce…

[Phys. Rev. A 85, 052328] Published Tue May 29, 2012

Photonic crystals are periodic systems that consist of dielectrics with different refractive indices. They are designed to act on photons in contrast to semiconductor crystals whose periodicity affects the motion of electrons. Here we consider the interaction of an atomic electron with its own radia…

[Phys. Rev. A 85, 053836] Published Tue May 29, 2012

We put forward a general classical approach to obtain the quantum dipole-dipole interaction (DDI) between two two-level “atoms” in arbitrary nanostructures, in which the transfer rate of the DDI is analytically expressed as the difference between the two classical dipoles’ total radiation power and …

[Phys. Rev. A 85, 053827] Published Tue May 22, 2012

We introduce the concept of an indirect photonic transition and demonstrate its use in a dynamic delay line to alter the group velocity of an optical pulse. Operating on an ultrafast time scale, we show continuously tunable delays of up to 20 ps, using a slow light photonic crystal waveguide only $\mathrm{30\dots }$

[Phys. Rev. Lett. 108, 213901] Published Mon May 21, 2012

We report results of systematic numerical studies of two-dimensional matter-wave soliton families supported by an external potential, in a vicinity of the junction between stable and unstable branches of the families, where the norm of the solution attains a minimum, facilitating the creation of the…

[Phys. Rev. E 85, 057601] Published Fri May 18, 2012

Responses from one-dimensional magnetophotonic crystals terminated by gold layers have been studied experimentally. Such a plasmonic magnetophotonic crystal slab supported an optical resonance (optical Tamm state) originating from the periodicity of the magnetophotonic crystal and a surface plasmon …

[Phys. Rev. B 85, 205130] Published Fri May 18, 2012

We study two-component solitons and their symmetry-breaking bifurcations (SBBs) in linearly coupled photonic systems with a spatially inhomogeneous strength of the coupling. One system models an inverted virtual photonic crystal, built by periodically doping the host medium with atoms implementing t…

[Phys. Rev. A 85, 053821] Published Fri May 18, 2012

Special localized wave modes show up in several physical scenarios including BEC in optical lattices, nonlinear photonic crystals, and systems with strong electron-phonon interaction. These result from an underlying nonlinear contribution to the wave equation that is usually assumed to be instantane…

[Phys. Rev. E 85, 057201] Published Mon May 14, 2012