OSA's Digital Library

Journal of the Optical Society of America B

Journal of the Optical Society of America B

| OPTICAL PHYSICS

  •  

Optics InfoBase > JOSA B > Early Posting

Early Posting

Accepted papers to appear in an upcoming issue

OSA now posts prepublication articles as soon as they are accepted and cleared for production. See the FAQ for additional information.

<< Previous Page Articles 21 to 35 of 35

July


SLAB PHOTONIC CRYSTALS WITH DIMER CYLINDER BASES

  • Erin Riley and Chekesha Liddell Watson
  • received 05/14/2014; accepted 07/13/2014; posted 07/14/2014; Doc. ID 211361
  • [full text: PDF (27831) KB)]
  • Abstract: The photonic band gap properties of centered rectangular dimer cylinder structures are reported. The theoretical model is inspired by a crystalline phase found for colloidal self-assembly of asymmetric dimers. The band structures as a function of degree of lobe fusion and degree of lobe symmetry are calculated in accordance with the tunable features resulting from seeded emulsion polymerization synthesis. The parameters are varied incrementally from single circular cross-section cylinders to lobe-tangent dimer cylinders. Odd, even and polarization independent gaps in the guided modes are found for direct and inverted slab structures. A wide range of shape parameter combinations in structures having low to moderate Brillouin zone distortion from hexagonal supported relative gap widths up to 19.1% (3-4 odd gap) and 14.6% (1-2 even gap) for direct structures. Slab thickness was tuned to overlap even and odd mode gap frequency ranges generating a 9.9% polarization independent gap. The results are compared with those from model centered rectangular slabs having dimer particle bases that limit the slab height. Inverted slab structures yielded a large maximum 40.4% 1-2 even mode gap and for up to 25% Brillouin zone distortion still supported significant gaps (> 32%).

Keywords (OCIS):

  • (160.4760) Materials : Optical properties
  • (160.5298) Materials : Photonic crystals

Efficient heralding of polarization-entangled photons from type-0 and type-II spontaneous parametric down-conversion in periodically poled KTiOPO₄

  • Fabian Steinlechner, Marta Gilaberte, Marc Jofre, Thomas Scheidl, Juan Torres, Valerio Pruneri, and Rupert Ursin
  • received 05/08/2014; accepted 07/11/2014; posted 07/11/2014; Doc. ID 209002
  • [full text: PDF (632) KB)]
  • Abstract: Ultra-bright sources of entangled photon pairs with high heralding efficiency are an important step in the pursuit of high bit-rate entanglement-base quantum key distribution, as well as an enabling tool for loss-sensitive quantum optics experiments. Here, we present a robust single-mode fiber coupled source of polarization-entangled photons around 810nm with both high brightness and heralding efficiency. Our approach is based on quasi-phase-matched spontaneous parametric down-conversion (SPDC) from periodically poled KTiOPO₄ in a Sagnac loop configuration. We demonstrate a high degree of two-photon polarization-entanglement for single-frequency-pumped type-0 and type-II SPDC, and conduct a conclusive comparison in terms of efficiency and spectral characteristics. In light of applications outside a laboratory environment, we evaluate the feasibility of pumping the nonlinear crystals with free-running laser diodes.

Keywords (OCIS):

  • (270.0270) Quantum optics : Quantum optics
  • (190.4975) Nonlinear optics : Parametric processes
  • (270.5565) Quantum optics : Quantum communications

Complete polarized-photons Bell states and Greenberger-Horne-Zeilinger states analysis assisted by atoms

  • Yan Xia, Yi-Hao Kang, and Pei-Min Lu
  • received 05/14/2014; accepted 07/11/2014; posted 07/11/2014; Doc. ID 212084
  • [full text: PDF (286) KB)]
  • Abstract: We propose an alternative protocol for complete polarized photons Bell states and Greenberger-Horne-Zeilinger states analysis assisted by atoms. In our protocol, the assistant atoms are trapped in cavities quantum electrodynamics (QED) which are feasible with current experimental technology. Comparing with previous protocols, we do not need cross-Kerr nonlinearity or hyperentanglement which is usually difficult to obtain. Moreover, the polarized photons entangled states will not be destroyed in our protocol. This might lead to a useful step toward the construction of more efficient quantum circuits and quantum algorithms.

Keywords (OCIS):

  • (270.0270) Quantum optics : Quantum optics
  • (270.5570) Quantum optics : Quantum detectors
  • (270.5565) Quantum optics : Quantum communications
  • (270.5585) Quantum optics : Quantum information and processing

Phase knob for switching steady-state behaviors from bistability to multi-stability via spontaneously generated coherence

  • Zhonghu Zhu, Ai-Xi Chen, Wen-Xing Yang, and Ray-Kuang Lee
  • received 05/14/2014; accepted 07/08/2014; posted 07/09/2014; Doc. ID 212078
  • [full text: PDF (497) KB)]
  • Abstract: We investigate theoretically the optical steady-state behavior in $N$ four-level Y-type atoms driven coherently by a probe laser and a single elliptically polarized field (EPF) by means of a unidirectional ring cavity. It is found that the optical bistability can be observed for a wide regime of frequency detuning of the probe field, intensity of the EPF and the atomic cooperation parameter. Interestingly enough, in principle the optical steady-state behavior can be switched from optical bistability to multistability or vice versa by adjusting the phase difference between two components of polarized electric field of the EPF if the perfect spontaneously generated coherence of atoms is included. Our results illustrate the potential to utilize EPF for all-optical switching in atomic system through the phase control, as well as a guidance in the design for possible experimental implementations.

Keywords (OCIS):

  • (190.0190) Nonlinear optics : Nonlinear optics
  • (190.1450) Nonlinear optics : Bistability
  • (270.0270) Quantum optics : Quantum optics
  • (270.1670) Quantum optics : Coherent optical effects

Light-trapping in guided modes of thin-film-silicon-on-silver waveguides by scattering from a nanostrip

  • Thomas Sondergaard, Yao-Chung Tsao, Peter Kristensen, Thomas Pedersen, and Kjeld Pedersen
  • received 05/22/2014; accepted 07/08/2014; posted 07/09/2014; Doc. ID 212606
  • [full text: PDF (848) KB)]
  • Abstract: Light-trapping in a waveguide configuration consisting of a thin planar film of hydrogenated amorphous silicon (aSi:H) on a planar silver back-reflector is studied theoretically and experimentally. Light-trapping is achieved by scattering of light from a silver or silicon nanostrip placed directly on the silicon-film surface. For thin films it is appropriate to think of light-trapping in terms of coupling into the guided modes of the air-aSi:H-silver waveguide configuration, which is the focus of this paper. Using the Green’s function surface integral equation method we calculate cross sections governing extinction, out-of-plane scattering, and scattering into guided modes. It is found for geometries with aSi:H-film thicknesses in the range of 50-500 nm that distinct peaks in extinction and scattering cross section spectra are located at wavelengths determined by the cut-off wavelengths of guided modes, and the wavelengths of those peaks are insensitive to the precise geometry of the scatterer. Measurements of extinction and scattering from an array of silver strips spaced by a large distance of 10 μm on the surface of a geometry with a 290 nm aSi:H-film are found to be in good agreement with theoretical predictions.

Keywords (OCIS):

  • (130.2790) Integrated optics : Guided waves
  • (240.6680) Optics at surfaces : Surface plasmons
  • (290.5820) Scattering : Scattering measurements
  • (050.1755) Diffraction and gratings : Computational electromagnetic methods
  • (290.5825) Scattering : Scattering theory
  • (050.6624) Diffraction and gratings : Subwavelength structures

Stochastic noise amplification in noninstantaneous Kerr media

  • G. da Silva, T. Lobo, and A. Canabarro
  • received 04/04/2014; accepted 07/03/2014; posted 07/07/2014; Doc. ID 209622
  • [full text: PDF (1314) KB)]
  • Abstract: Considering noninstantaneous Kerr nonlinearity, the propagation of a partially coherent optical beam are theoretically investigated by using extensions of the nonlinear Schr\"odinger equation (NLSE). In order to account for the partial coherence of the beam, a phase-diffusion model is used for the laser beam. To introduce the finite response time of the medium, a time dependent nonlinear response is incorporated in the system of NLSE using the Debye relaxation model. We analytically deduce the dispersion relation and numerically compute the gain spectra along with relevant second-order statistical quantities. A detailed study of how these statistical properties are influenced by the GVD regime as well as by the delayed nonlinear response of the material is presented. The distinct features for slow and fast delayed nonlinear response are also emphasized.

Keywords (OCIS):

  • (030.1640) Coherence and statistical optics : Coherence
  • (030.6600) Coherence and statistical optics : Statistical optics
  • (190.3100) Nonlinear optics : Instabilities and chaos
  • (190.5530) Nonlinear optics : Pulse propagation and temporal solitons
  • (190.5650) Nonlinear optics : Raman effect

Doppler broadened NICE-OHMS – Optimum modulation and demodulation conditions, cavity length, and modulation order

  • Isak Silander, Ove Axner, and Patrick Ehlers
  • received 05/01/2014; accepted 07/03/2014; posted 07/07/2014; Doc. ID 211230
  • [full text: PDF (637) KB)]
  • Abstract: Doppler broadened noise-immune cavity-enhanced optical heterodyne molecular spectrometry (Db-NICE-OHMS) has been scrutinized with respect to modulation and demodulation conditions (encompassing the modulation frequency, νm, the modulation index, β, and the detection phase, θ), the cavity length, L, and the modulation order, k, (defined as νm / νFSR where νFSR is the free-spectral range of the cavity) primarily in the Doppler limit but also for a specific situation in the Voigt regime (for equal Doppler and homogeneous width), both in the absence and presence of optical saturation. It is found that, for a system with a given cavity length, the optimum conditions (i.e. those that produce the largest NICE-OHMS signal) for an unsaturated transition in the Doppler limit comprise νm/ΓD = 1.6 (where ΓD is the HWHM of the Doppler width of the transition), β = 1.3, and θ = 0.78π. It is also found that the maximum is rather broad, the signal takes 95% of its maximum value for modulation frequencies in the entire 0.4 ≤ νm / ΓD ≤ 2.4 range. When optical saturation sets in, θ shifts towards the dispersion phase. The optimum conditions encompass k>1 whenever L > 0.35 LD and 2.6 LD for the dispersion and absorption modes of detection, respectively [where LD is a characteristic length given by c/(2 ΓD)]. Similar conditions are found for the case with a Voigt profile.

Keywords (OCIS):

  • (120.6200) Instrumentation, measurement, and metrology : Spectrometers and spectroscopic instrumentation
  • (140.4780) Lasers and laser optics : Optical resonators
  • (300.6310) Spectroscopy : Spectroscopy, heterodyne
  • (300.6380) Spectroscopy : Spectroscopy, modulation
  • (300.6390) Spectroscopy : Spectroscopy, molecular
  • (140.3518) Lasers and laser optics : Lasers, frequency modulated

(PNR2014) Absolute spectral calibration of an intensified CCD camera using twin beams

  • Ondrej Haderka, Jan Perina, Vaclav Michalek, and Martin Hamar
  • received 04/23/2014; accepted 07/01/2014; posted 07/03/2014; Doc. ID 210718
  • [full text: PDF (568) KB)]
  • Abstract: Twin beams composed of photon pairs are used for absolute determination of quantum detection efficiency of an intensified CCD camera. A method of fitting the experimental photocount statistics with the paired superposition of signal and noise combined with additional determination of losses in the beams before the detector is used to reveal the detection efficiencies. The experiment has been performed in several spectral regions defined by the used interference filters. Also, the used twin beams have been reconstructed.

Keywords (OCIS):

  • (230.5160) Optical devices : Photodetectors
  • (270.0270) Quantum optics : Quantum optics
  • (270.5290) Quantum optics : Photon statistics
  • (190.4975) Nonlinear optics : Parametric processes

June


Local Field Effects for Spherical Quantum Dot Emitters in the Proximity to a Planar Dielectric Interface

  • J. Gordon and Yu. Gartstein
  • received 04/11/2014; accepted 06/27/2014; posted 06/30/2014; Doc. ID 209990
  • [full text: PDF (521) KB)]
  • Abstract: We use numerical solutions of macroscopic Maxwell's equations to study spontaneous emission rates of model spherical quantum dot (QD) emitters in the vicinity of a highly polarizable dielectric substrate. It is demonstrated that extra polarization of the QD body taking place in the interfacial region may lead to appreciable deviations from the rates that would be expected under the assumption of a fixed magnitude of the effective QD transition dipole moment. Illustrations are given for both radiative and non-radiative decay processes and potential experimental implications are discussed.

Keywords (OCIS):

  • (160.6000) Materials : Semiconductor materials
  • (260.2160) Physical optics : Energy transfer
  • (300.2140) Spectroscopy : Emission
  • (250.5590) Optoelectronics : Quantum-well, -wire and -dot devices

Quantifying the source of enhancement in experimental continuous variable quantum illumination

  • Sammy Ragy, Ivano Ruo Berchera, Ivo Degiovanni, Stefano Olivares, Matteo Paris, Gerardo Adesso, and Marco Genovese
  • received 04/04/2014; accepted 06/23/2014; posted 07/09/2014; Doc. ID 209289
  • [full text: PDF (730) KB)]
  • Abstract: A quantum illumination protocol exploits correlated light beams to enhance the probability of detection of a partially reflecting object lying in a very noisy background. Recently a simple photon-number-detection based implementation of a quantum illumination-like scheme has been provided in [Lopaeva {\it et al,}, Phys. Rev. Lett. {\bf 101}, 153603 (2013)] where the enhancement is preserved despite the loss of non-classicality. In the present paper we investigate the source for quantum advantage in that realization, by analysing the mutual information in an effective two-mode description of the light sources. We find that the improvement in the signal-to-noise ratio achieved by the entangled sources over the unentangled thermal ones is closely related to the respective ratio of mutual informations, with both quantities being specified by the squared ratio of the corresponding cross-correlations in the relevant regime of a highly thermalized background. An analysis of the experimental data confirms this theoretical result.

Keywords (OCIS):

  • (270.5570) Quantum optics : Quantum detectors
  • (270.6570) Quantum optics : Squeezed states
  • (270.5585) Quantum optics : Quantum information and processing

Influence of nonlinear effects on the three-photon excitation of L-Tryptophan in water using phase-shaped pulses

  • Alexander Patas, Georg Achazi, Christopher Winta, and Albrecht Lindinger
  • received 04/01/2014; accepted 06/22/2014; posted 06/24/2014; Doc. ID 209137
  • [full text: PDF (571) KB)]
  • Abstract: We demonstrate the control of the three-photon excitation of L-Tryptophan in water using a pulse shaping setup. This can lead to selective excitation of amino acids by a near infrared femtosecond laser source. Furthermore we show that additional nonlinear effects like self-phase modulation in the sample have to be considered when using this approach. Simulations of the propagation of the laser pulses in the cuvette exhibit a good agreement to the experimental fluorescence scans at different laser intensities and show large discrepancies when neglecting nonlinear effects prior to the three-photon process.

Keywords (OCIS):

  • (190.7110) Nonlinear optics : Ultrafast nonlinear optics
  • (300.2530) Spectroscopy : Fluorescence, laser-induced
  • (300.6410) Spectroscopy : Spectroscopy, multiphoton
  • (320.5540) Ultrafast optics : Pulse shaping

Analysis of One-Third Harmonic Generation in Waveguides

  • Yunxu Sun, Xuguang Shao, Tianye Huang, Zhifang Wu, Timothy Lee, Shum Perry, and Gilberto Brambilla
  • received 05/07/2014; accepted 06/22/2014; posted 07/14/2014; Doc. ID 211426
  • [full text: PDF (678) KB)]
  • Abstract: This paper investigates the one-third harmonic generation (OTHG) by analytical methods with a nondepletion approximation and with an exact solution in continuous wave conditions. Nondepletion method shows that the OTHG with a small initial power is confined in a very small range except that the overlapping integrals of the pump and signal follow certain relation. The efficiency depends only on the initial conditions. Increasing pump power only shortens the interaction length to reach the maximum conversion. Furthermore, we exactly explore the OTHG by the elliptic functions whose expressions depend on the types of the roots derived from the integral and the initial power. We find that the output power level is limited by the initial conditions and the structure of waveguides while the pump power only determines the period. There is a constant value Γ that is determined by U₀, θ₀, and the overlap integrals, where U₀ and θ₀ are the initial power of signal and the initial phase difference between pump and signal, separately. We found that a high efficient conversion only occurs when Γ is larger than a specific value Γc, called as critical value. A Γc provides a relation between U₀ and θ₀. So a set of critical conditions of U₀ and θ₀ is obtained. A high efficient conversion may be supported if U₀ is larger than the power in this set. We investigated some typical structure parameters and find the minimum initial power supporting high conversion efficiency. In OTHG, the variation curve has a sharp peak pattern, which means that a variation of the initial phase difference leads to a great change of the conversion. We established a way to get the smallest initial power with a large phase tolerance. Finally, we find a relation among the overlapping integrals and phase mismatching that can support a high conversion efficiency with a small initial power. This study gives valuable suggestion on the experimental design.

Keywords (OCIS):

  • (190.0190) Nonlinear optics : Nonlinear optics
  • (190.2620) Nonlinear optics : Harmonic generation and mixing

Potentials for large optical gain improvement of Erbiumdoped slot waveguide amplifiers in silicon photonics

  • Samuel Serna, Weiwei Zhang, Xavier Leroux, Dingshan GAO, Daming ZHANG, Laurent Vivien, and Eric Cassan
  • received 04/24/2014; accepted 06/21/2014; posted 06/30/2014; Doc. ID 210518
  • [full text: PDF (3182) KB)]
  • Abstract: The potentials for on-chip optical amplification at  􀯦 =1530 nm in silicon photonics using Erbium-doped rich polymers integrated in silicon slot waveguides are investigated by using a four level spectroscopic model and a pumping wavelength of 1.48μm. It is shown that the key parameter driving the whole amplification efficiency is the slot waveguide linear loss level, while optimization of the hollow core waveguide cross-section leads to a slot width around 130nm. Our investigations show that an on-chip optical gain of about 10dB can be obtained with 7dB/cm loss slot waveguides. Such a propagation loss is directly sustained by experimental results obtained for photonic structures fabricated using silicon technology. Due to the likelihood of improved technological processes in a near future, the slot waveguide loss level was swept in the 3dB/cm-10dB/cm range, showing that on-chip optical gain up to 30dB can be seriously envisaged for slot waveguides with optimized optical losses around 3dB/cm.

Keywords (OCIS):

  • (130.1750) Integrated optics : Components
  • (130.3120) Integrated optics : Integrated optics devices
  • (230.4480) Optical devices : Optical amplifiers

Nonlinear interaction of two trapped-mode resonances in a bilayer fish-scale metamaterial

  • Vladimir Tuz, Denis Novitsky, Pavel Mladyonov, Sergey Prosvirnin, and Andrey Novitsky
  • received 03/03/2014; accepted 06/06/2014; posted 07/21/2014; Doc. ID 207512
  • [full text: PDF (850) KB)]
  • Abstract: We report on a bistable light transmission through a bilayer "fish-scale" (meander-line) metamaterial. It is demonstrated that an all-optical switching may be achieved nearly the frequency of the high-quality-factor Fano-shaped trapped-mode resonance excitation. The nonlinear interaction of two closely spaced trapped-mode resonances in the bilayer structure composed with a Kerr-type nonlinear dielectric slab is analyzed in both frequency and time domains. It is demonstrated that these two resonances react differently on the applied intense light which leads to destination of a multistable transmission.

Keywords (OCIS):

  • (190.1450) Nonlinear optics : Bistability
  • (230.1150) Optical devices : All-optical devices
  • (230.4320) Optical devices : Nonlinear optical devices
  • (160.3918) Materials : Metamaterials

Light scattering from coupled plasmonic nanospheres on a substrate: Erratum

  • Yia-Chung Chang and Hyai-Yi Xie
  • received 07/18/2014; accepted ; posted 07/18/2014; Doc. ID 216961
  • [full text: PDF (245) KB)]
  • Abstract: Below Eq. (1) in Ref [1], the statement “ is the incident electric field (a three dimensional vector).” should be replaced.

Keywords (OCIS):

  • (120.2130) Instrumentation, measurement, and metrology : Ellipsometry and polarimetry
  • (290.5825) Scattering : Scattering theory

<< Previous Page Articles 21 to 35 of 35





Browse Journals / Lookup Meetings

Browse by Journal and Year


   


Lookup Conference Papers

Close Browse Journals / Lookup Meetings