Cavity Modes (cavity + mode)

Distribution by Scientific Domains
Physics and Astronomy71%

Selected Abstracts

The effects of degeneracy of atomic levels on single-photon emission via Raman scattering

LASER PHYSICS LETTERS, Issue 8 2008
V.A. Reshetov
Abstract The three-level , -type atom with degenerate atomic levels is considered, one of its transitions being driven by the coherent field, the other being coupled to the single-mode quantized field of the high-Q cavity. The probability of emission of a single photon in the cavity via Raman scattering versus the mutual orientation of polarization vectors of the cavity mode and of the driving coherent pulse is studied. The efficiency of the retrieval of a single-photon excitation, stored in the atomic ground state (as suggested, e.g., in paper [1]), versus the mutual orientation of polarizations of cavity modes and of the coherent "write" and "read" pulses is also investigated. The numerical calculations are carried out for the transitions between hyperfine components of the ground 6S1/2 and excited 6P3/2 states of Cesium atoms, which were exploited in the experiments [1]. The optimal polarizations providing the maximum probability of photon emission and maximum retrieval efficiency are determined. (© 2008 by Astro Ltd., Published exclusively by WILEY-VCH Verlag GmbH & Co. KGaA) [source]

Microcavity modified spontaneous emission of single quantum dots

PHYSICA STATUS SOLIDI (B) BASIC SOLID STATE PHYSICS, Issue 8 2007
G. S. Solomon
Abstract We summarize our earlier research showing how the radiative properties of an individual InAs quantum dot exciton state can be altered by their spatial and spectral position with respect to a discrete semiconductor microcavity mode. The InAs quantum dot is formed epitaxially in GaAs, and the microcavity is processed from a one-wavelength distributed Bragg reflector planar microcavity of GaAs and AlAs to form a sub-micrometer diameter pillar. Two states are tuned through a discrete cavity mode through sample temperature changes and show a spontaneous emission enhancement of 4. (© 2007 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim) [source]

Strong exciton-light coupling in photonic crystal nanocavities

PHYSICA STATUS SOLIDI (C) - CURRENT TOPICS IN SOLID STATE PHYSICS, Issue 2 2005
Dario Gerace
Abstract The strong coupling regime between excitons in a single self-assembled InAs quantum dot and the cavity mode in a photonic-crystal structure embedded in GaAs planar waveguides is theoretically investigated. It is concluded that zero-dimensional mixed states should form when the quality factor of the cavity mode is higher than Q , 2000. The corresponding vacuum-field Rabi splitting is close to its limiting value already for Q , 10000. Results are shown for a model GaAs-based photonic crystal nanocavity, in which single quantum dot excitons are predicted to be always in the strong coupling regime if the quantum dot is placed close to the antinode position of the electric field. (© 2005 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim) [source]

Self-Assembled Silica Photonic Crystal as a Liquid-Crystal Alignment Layer and its Electro-optic Applications in Fabry,Perot Cavity Structures,

ADVANCED MATERIALS, Issue 19 2004
Y. Ha
Microgrooves on self-assembled photonic-crystal (PC) films align liquid crystals (LCs) without any additional rubbing or surface treatment. Nematic (see Figure and inside cover) or twisted-nematic LCs can be formed, depending on the relative orientation of the microgrooved films. A LC Fabry,Perot (FP) cavity was fabricated using these PC films, and electro-optic tuning of FP cavity modes is demonstrated. [source]

The effects of degeneracy of atomic levels on single-photon emission via Raman scattering

LASER PHYSICS LETTERS, Issue 8 2008
V.A. Reshetov
Abstract The three-level , -type atom with degenerate atomic levels is considered, one of its transitions being driven by the coherent field, the other being coupled to the single-mode quantized field of the high-Q cavity. The probability of emission of a single photon in the cavity via Raman scattering versus the mutual orientation of polarization vectors of the cavity mode and of the driving coherent pulse is studied. The efficiency of the retrieval of a single-photon excitation, stored in the atomic ground state (as suggested, e.g., in paper [1]), versus the mutual orientation of polarizations of cavity modes and of the coherent "write" and "read" pulses is also investigated. The numerical calculations are carried out for the transitions between hyperfine components of the ground 6S1/2 and excited 6P3/2 states of Cesium atoms, which were exploited in the experiments [1]. The optimal polarizations providing the maximum probability of photon emission and maximum retrieval efficiency are determined. (© 2008 by Astro Ltd., Published exclusively by WILEY-VCH Verlag GmbH & Co. KGaA) [source]

Transmission through and wave guidance on metal plates perforated by periodic arrays of through-holes of subwavelength coaxial cross-section

MICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 7 2007
Vitaliy Lomakin
Abstract Perfect electrically conducting (PEC) plates perforated by doubly periodic arrays of through-holes of subwavelength coaxial cross-section permit enhanced transmission of plane waves and support surface wave guidance. The transmission enhancement is attributed to coupling of free-space fields to TEM and TE11 modal fields in holes and occurs via two distinct mechanisms. The first couples incident fields to local resonances (cavity modes) supported by individual holes. The second couples scattered fields (diffraction modes) to global resonances (surface waves). The surface waves arise due to strong interactions between the holes and can have a large propagation wavenumber. The presented PEC model is adequate in the microwave and terahertz regimes and insights into related wave phenomena at optical frequencies.© 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 1554,1558, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22484 [source]

Reflectance and photoluminescence studies of InGaN/GaN multiple-quantum-well structures embedded in an asymmetric microcavity

PHYSICA STATUS SOLIDI (B) BASIC SOLID STATE PHYSICS, Issue 7 2006
D. Y. Lin
Abstract Using reflectance (R) and photoluminescence (PL) measurements InGaN/GaN multiple-quantum-well (MQW) structures embedded in an asymmetric microcavity with different thickness of stacking pairs have been studied. The asymmetric microcavity structures are composed of a cavity sandwitched between the air/semiconductor interface and a mirror using distributed Bragg reflector (DBR). For the DBR with thinner AlN layers the high-reflectivity stop band locates at higher photon energy. The luminescence efficiency and the spectrum of InGaN/GaN multiple-quantum-well structures will be modified by the microcavity. A comparison of PL with R spectra shows that the emission efficiency can be enhanced by matching up the luminescence spectrum coming from the MQW and the high-reflectivity stop band. From the blue shift of the cavity modes as a function of incident angles the refractive index and cavity length can be determined. By measuring the PL spectra as a function of emission angle, it is found that the PL spectra were predominatly determined by microcavity resonances. (© 2006 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim) [source]