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Opto-thermally Excited Fabry-Perot Resonance Frequency Behaviors of Clamped Circular Graphene Membrane
摘要： An opto-thermally excited optical fiber Fabry-Perot (F-P) resonant probe with suspended clamped circular graphene diaphragm is presented in this paper. Then, the dependence of resonance frequency behaviors of graphene diaphragm upon opto-mechanical factors including membrane properties, laser excitation parameters and film boundary conditions are investigated via COMSOL Multiphysics simulation. The results show that the radius and thickness of membrane will linearly affect the optical fiber light-induced temperature distribution, thus resulting in rapidly decreasing resonance frequency changes with the radius-to-thickness ratio. Moreover, the prestress can be regulated in the range of 108 Pa to 109 Pa by altering the environmental temperature with a scale factor of 14.2 MPa/K. It is important to note that the availability of F-P resonant probe with a defective clamped circular graphene membrane can be improved notably by fabricating the defected circular membrane to a double-end clamped beam, which gives a broader perspective to characterize the resonance performance of opto-thermally excited F-P resonators.
关键词： opto-thermal actuation,graphene membrane,Fabry-Perot resonator,resonance frequency simulation
更新于2025-11-28 14:23:57
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[IEEE 2018 Second International Conference on Electronics, Communication and Aerospace Technology (ICECA) - Coimbatore (2018.3.29-2018.3.31)] 2018 Second International Conference on Electronics, Communication and Aerospace Technology (ICECA) - A High Gain Fabry Perot Resonator Antenna (FPRA)
摘要： A high gain Fabry Perot Resonator Antenna (FPRA) configuration with a E shaped patch radiator is presented. The E shaped patch radiator is etched on Perfect Dielectric Substrate (PDS) air with a Perfect Electrical Conductor (PEC) ground plane. The high gain is realized by employing a Partially Reflective Surface (PRS) structure to achieve an unchangeable reflection phase with a source antenna to excite the 5x3 array PRS square ring cells. The proposed Fabry Perot Resonator (FPR) antenna is designed to operate at 1.8GHz, simulated and results show that the antenna has -10dB impedance bandwidth of about 10% operating in the frequency range of 1.74GHz – 1.92GHz. The gain of the antenna has around 12.5dB over the band.
关键词： Patch radiator.,Fabry Perot Resonator (FPR),Partially Reflective Surface (PRS)
更新于2025-09-23 15:23:52
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[IEEE NAECON 2018 - IEEE National Aerospace and Electronics Conference - Dayton, OH, USA (2018.7.23-2018.7.26)] NAECON 2018 - IEEE National Aerospace and Electronics Conference - Electromagnetic Propagation across an Achiral/Chiral (Dispersive) Boundary Using Phasor Approach to Fresnel Coefficients
摘要： Electromagnetic propagation across an achiral/chiral interface has been studied to evaluate Fresnel coefficients and examine the propagation characteristics. Extending the problem to include dispersive chiral dielectrics and discrete components may lead to potential applications such as tunable superlenses (with imaging and vision implications) and also devices including chiral Fabry-Perot etalons.
关键词： Fresnel coefficients,chiral Fabry-Perot resonator,metamaterials,chiral media,internal reflection,anomalous Brewster phenomenon
更新于2025-09-23 15:22:29
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ELECTRODELESS MEASUREMENT TECHNIQUE OF COMPLEX DIELECTRIC PERMITTIVITY OF HIGH-K DIELECTRIC FILMS IN THE MILLIMETER WAVELENGTH RANGE
摘要： An electrodeless measurement technique of complex dielectric permittivity of high-K dielectric ?lms is described. The technique is based on a quasi-optic Fabry-Perot resonator and modi?ed for investigation of two-layer dielectric structures — substrate/K-?lm. This procedure is destined to be used for providing a simple intermediate control of parameters of high-K ?lms before the following technological process. Regimes of measurements providing the most sensitive conditions for de?nition of ?lm parameters are considered. The proposed method is tested on two-layer structures with well-known parameters and is used for characterization of ferroelectric (Ba,Sr)TiO3 ?lms in the millimeter wavelength range (～ 50 GHz).
关键词： Fabry-Perot resonator,complex dielectric permittivity,electrodeless measurement,millimeter wavelength range,high-K dielectric films
更新于2025-09-23 15:21:21
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[IEEE 2018 9th International Conference on Ultrawideband and Ultrashort Impulse Signals (UWBUSIS) - Odessa, Ukraine (2018.9.4-2018.9.7)] 2018 9th International Conference on Ultrawideband and Ultrashort Impulse Signals (UWBUSIS) - Polarization Properties of the Fabry-Perot Resonator with Coaxial-Sector Apertures in Mirrors
摘要： Numerical electrodynamic properties of the Fabry-Perot resonator with coaxial-sector apertures and waveguide loads have been performed. The possibility of obtaining the circular polarization of the electric field in the volume of the resonator is revealed. It is shown that the polarization of the electric field in the resonator volume can be controlled by changing the distance between the mirrors or the length of the shorted waveguides of one of the mirrors.
关键词： the Stokes parameters,Fabry-Perot resonator,coaxial-sector waveguide
更新于2025-09-23 15:21:21
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[IEEE 2018 11th UK-Europe-China Workshop on Millimeter Waves and Terahertz Technologies (UCMMT) - HangZhou, China (2018.9.5-2018.9.7)] 2018 11th UK-Europe-China Workshop on Millimeter Waves and Terahertz Technologies (UCMMT) - A Fabry-Perot Resonator Antenna based on Graphene Patch Array
摘要： In order to achieve a high directivity antenna for terahertz, an improved Fabry-Perot resonator antenna based on graphene is proposed. The antenna consists of a graphene patch array on a grounded dielectric and a rectangle waveguide. According to the theory of Fabry-Perot resonant cavity, the directivity of antenna will increase obviously by choosing proper chemical potential of graphene and appropriate distance of resonant cavity. The radiation pattern of antenna also changes with the chemical potential.
关键词： Terahertz,Antenna,Graphene,tunability,Fabry-Perot resonator
更新于2025-09-23 15:21:01
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A metasurfacea??enabled wideband higha??gain duala??circularlya??polarized Fabrya??Perot resonator antenna
摘要： This paper presents a wideband high-gain dual-circularly-polarized (CP) antenna with a simple configuration. Instead of improving the gain using the dual-CP element array, the Fabry-Perot resonator antenna concept is applied in this work. By designing a dual-linearly-polarized Fabry-Perot resonator antenna and a linear-to-circular polarization (LP-CP) metasurface polarizer separately and combining them, a wideband high-gain dual-CP antenna can be achieved. Structural simplicity and less design difficulty are advantages of the antenna design. Experimental results validate the design concept. It exhibits 3-dB axial-ratio bandwidths of over 12% for both LHCP and RHCP performance, a high polarization isolation of over 25 dB, and peak gains of 12.78 dBi and 12.89 dBi for LHCP and RHCP radiations respectively.
关键词： wideband,metasurface,dual-circularly-polarized,high-gain,Fabry-Perot resonator antennas
更新于2025-09-23 15:21:01
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Slow and fast single photons from a quantum dot interacting with the excited state hyperfine structure of the Cesium D1-line
摘要： Hybrid interfaces between distinct quantum systems play a major role in the implementation of quantum networks. Quantum states have to be stored in memories to synchronize the photon arrival times for entanglement swapping by projective measurements in quantum repeaters or for entanglement purification. Here, we analyze the distortion of a single-photon wave packet propagating through a dispersive and absorptive medium with high spectral resolution. Single photons are generated from a single in(Ga)As quantum dot with its excitonic transition precisely set relative to the cesium D1 transition. the delay of spectral components of the single-photon wave packet with almost Fourier-limited width is investigated in detail with a 200 MHz narrow-band monolithic Fabry-Pérot resonator. Reflecting the excited state hyperfine structure of Cesium, “slow light” and “fast light” behavior is observed. As a step towards room-temperature alkali vapor memories, quantum dot photons are delayed for 5 ns by strong dispersion between the two 1.17 GHz hyperfine-split excited state transitions. Based on optical pumping on the hyperfine-split ground states, we propose a simple, all-optically controllable delay for synchronization of heralded narrow-band photons in a quantum network.
关键词： slow light,optical pumping,single-photon wave packet,quantum networks,quantum dot,cesium D1 transition,fast light,Fabry-Pérot resonator
更新于2025-09-16 10:30:52
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[IEEE 2019 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC) - Munich, Germany (2019.6.23-2019.6.27)] 2019 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC) - Phase Noise Robustness of a Coherent Spatially Parallel Optical Reservoir
摘要： Reservoir computing is a machine learning technique that is particularly adapted to process time dependent information. It is also very well suitable to experimental implementations, and in particular photonic implementations. In the present work we propose strategies to improve the phase noise robustness of a spatially parallel reservoir computer based on a coherent photonic cavity without active stabilization. The system, described in [4], is currently under development in our laboratory. It is based on a linear Fabry-Pérot resonator, with neurons encoded as a grid of 9 by 9 focused spots on the input mirror plane, and a nonlinear readout operating at 0.5GHz. The coupling between neurons is realized by a Spatial Light Modulator (SLM) placed at the back plane of the cavity and is optimized for each task. We present numerical results obtained for the 4-level channel equalization task, and we find similar results for the NARMA10 task.
关键词： Fabry-Pérot resonator,Spatial Light Modulator,phase noise robustness,Reservoir computing,photonic implementations
更新于2025-09-11 14:15:04
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[IEEE 2019 Wave Electronics and its Application in Information and Telecommunication Systems (WECONF) - Saint-Petersburg, Russia (2019.6.3-2019.6.7)] 2019 Wave Electronics and its Application in Information and Telecommunication Systems (WECONF) - Electronic Retuning of Acousto-Optic Laser Mode Locker. Experimental study
摘要： The effect of electronic retuning of acoustic resonances in an acousto-optic laser mode locker is investigated theoretically and experimentally. In the approximation of plane acoustic waves, the problem of excitation of the Fabry–Perot acoustic resonator by a plate piezoelectric transducer is solved with taking into account real parameters of a RF generator and matching elements. The resonances were retuned by changing reactive matching elements (inductance coil and capacitor) connected between the generator and the transducer. In the experiment, an acousto-optic cell made of crystalline quartz with a two-sectional lithium niobate transducer was used.
关键词： acoustic Fabry–Perot resonator,piezoelectric transducer,acousto-optic modulator,acousto-optic interaction,laser mode locking
更新于2025-09-11 14:15:04