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- 摘要
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- 实验方案
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[IEEE 2019 International Topical Meeting on Microwave Photonics (MWP) - Ottawa, ON, Canada (2019.10.7-2019.10.10)] 2019 International Topical Meeting on Microwave Photonics (MWP) - Reconfigurable photonic RF filters based on integrated Kerr frequency comb sources
摘要： We demonstrate two categories of photonic radio frequency (RF) filters based on integrated optical micro-combs. The first one is based on the transversal filtering structure and the second one is based on the channelization technique. The large number of wavelengths brought about by the microcomb results in a significantly increased RF spectral resolution and a large instantaneous bandwidth for the RF filters. For the RF transversal filter, we demonstrated Q factor enhancement, improved out-of-band rejection, tunable centre frequency, and reconfigurable filtering shapes. While a high resolution of 117 MHz, a large RF instantaneous bandwidth of 4.64 GHz, and programmable RF transfer functions including binary-coded notch filters and RF equalizing filters with reconfigurable slopes are demonstrated for the RF channelized filter. The microcomb-based approaches feature a potentially much smaller cost and footprint, and is promising for integrated photonic RF filters.
关键词： Microwave photonics,micro-ring resonators
更新于2025-09-11 14:15:04
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[IEEE 2019 IEEE 2nd Ukraine Conference on Electrical and Computer Engineering (UKRCON) - Lviv, Ukraine (2019.7.2-2019.7.6)] 2019 IEEE 2nd Ukraine Conference on Electrical and Computer Engineering (UKRCON) - Study of Perspective of Gaseous Dielectric Parameters Monitoring with Use of Coupled Biconical Resonators
摘要： The advantages of using coupled biconical resonators for monitoring the parameters of gaseous dielectrics are considered in the paper. In this case, one of the resonators is the reference one. Application of coupled biconical resonators makes it possible to detect deviations of the dielectric constant and loss tangent of the test medium with values of the order of 10-4 and 10-5 correspondingly.
关键词： coupled resonators,Q-factor,biconical resonator,resonance frequency,the complex dielectric constant
更新于2025-09-11 14:15:04
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[IEEE 2018 Conference on Optoelectronic and Microelectronic Materials and Devices (COMMAD) - Perth, Australia (2018.12.9-2018.12.13)] 2018 Conference on Optoelectronic and Microelectronic Materials and Devices (COMMAD) - Isotopically Pure Silcon-28 Whispering Gallery Mode Resonators: A Host for Narrow Linewidth Spin Ensembles
摘要： Single crystal isotopically pure 28Si cylindrical Whispering Gallery (WG) mode resonators have been machined from a rod of isotopically pure crystal. Before machining, the rod was loaded into a cavity with the best Bragg confined modes exhibiting Q-factors above a million for frequencies between 10 and 15 GHz. Electron Spin Resonance spectroscopy revealed a very narrow linewidth spin transition, with g-factor of 1.995±0.008. Analysis determined an upper limit to the linewidth of 7 kHz and a concentration of less than 1011 spins/cm3 (10 parts per trillion). After machining into WG mode resonators, the measured frequencies of the fundamental mode families were used to determine the relative permittivity of the material near 4 K and 20 mK to be 11.488±0.024, with the precision limited only by the dimensional accuracy of the resonator. However, the Q-factors were degraded to below 40,000. Raman spectroscopy revealed strain induced broadening on the radial surface of the crystal as a result of the machining. After an acid clean and etch, followed by annealing, the surface damage was repaired. Subsequently, high Q-factors were also restored. The next step will be to purposefully implant ions to try and realise narrow linewidth spin ensembles with clock transitions, which will couple to high-Q WG modes inside the crystal.
关键词： Narrow linewidth spin ensembles,Isotopically pure silicon-28,Q-factors,Electron Spin Resonance spectroscopy,Whispering Gallery Mode Resonators
更新于2025-09-11 14:15:04
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[IEEE 2019 44th International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz) - Paris, France (2019.9.1-2019.9.6)] 2019 44th International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz) - Whispering-Gallery Resonators for Highly Integrated Plasmonic THz Circuits
摘要： Whispering-gallery resonators based on spoof plasmonic rings are presented. The resonators exhibit exceptionally high quality factors for THz metasurfaces (in excess of 240). As the resonator is coupled to two waveguides, it can serve as narrowband band-stop and band-pass filter in an integrated plasmonic circuit. The complicated mode structure shows frequency comb-like behaviour.
关键词： Whispering-gallery resonators,THz metasurfaces,integrated plasmonic circuit,high quality factors,spoof plasmonic rings
更新于2025-09-11 14:15:04
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Parity-Time-Anyonic Coupled Resonators System With Tunable Exceptional Points
摘要： The Hermiticity of physical observable is the fundamental axioms in quantum mechanics. However, it is found that several non-Hermitian Hamiltonian still have real eigenvalues, especially the parity-time symmetric system. The property of parity-time symmetry leads the system to various nontrivial physics with interesting counterintuitive features around the exceptional point. In this study, we investigate the dynamics of parity-time-anyonic Hamiltonian under the tunable exceptional points related to an arbitrary phase of the system. We show that the parity-time symmetry can be achieved in a quasi-parity-time-symmetric system. Also the phase dependence symmetry is discussed based on the simulated results.
关键词： tunable exceptional points,coupled resonators,Parity-time-anyonic
更新于2025-09-11 14:15:04
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Improving the performance of nanostructure multifunctional graphene plasmonic logic gates utilizing coupled-mode theory
摘要： Nanostructure ring resonators are suitable devices for photonic integrated circuits. A nano-scale multifunctional logic device based on plasmon-induced transparency (PIT) is presented here. This device consists of a pair of hexagonal ring resonators coupled with two parallel metal–insulator–metal (MIM) waveguides. According to the coupled-mode theory, the appropriate detuning between the resonances wavelengths of two resonators acts as the key factor to achieve the PIT phenomenon. For this purpose, the PIT phenomenon for several metals utilized in MIM waveguides is studied. Also, graphene has been employed as the replacement for the metal under the hexagonal ring resonator and its parallel waveguides. However, the interaction of light with graphene as a 2D material is weak, by varying the dimensions of waveguides, rings, and their distances, and also, incident light wavelength and graphene chemical potential, we have achieved the desired couplings in the structure. Finite-difference-time-domain (FDTD) simulations confirm that “1” and “0” logic states which represent the high and low levels of the optical power can be achieved at the through and drop ports by changing the refractive index. It has been demonstrated that the proposed structure implements the function of logical operations including XOR and XNOR, simultaneously.
关键词： Logical operations,Nanostructure ring resonators,Plasmon-induced transparency,Finite-difference-time-domain,Graphene,Metal–insulator–metal waveguides
更新于2025-09-11 14:15:04
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[IEEE 2019 IEEE 62nd International Midwest Symposium on Circuits and Systems (MWSCAS) - Dallas, TX, USA (2019.8.4-2019.8.7)] 2019 IEEE 62nd International Midwest Symposium on Circuits and Systems (MWSCAS) - Rapid Simulation of Photonic Integrated Circuits using Verilog-A Compact Models
摘要： With the advent of silicon-based integration of photonics, there is a growing interest in the electronic circuits community to develop hybrid electronic-photonic integrated systems. However, photonic integrated circuits (PICs) design tools have focused on the solutions of Maxwell’s equations using numerical methods. Recently developed PIC system-level design tools employ s-parameter modeling of optical components. in such platforms, accurate modeling of electronic However, driver and interface circuits is not supported. To allow electronic integrated circuit (IC)-centric design, there is a trend of compact modeling of photonic components using Verilog-A so that they can be co-simulated with CMOS electronics. In this work, we present our modeling approach and a novel method for rapid frequency-domain simulation of PICs.
关键词： Ring resonators,Verilog-A,Silicon Photonics (SiP),CMOS photonics,Photonic integrated circuits (PICs)
更新于2025-09-11 14:15:04
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Ultra-Compact Tunable Filtering Rat-Race Coupler Based on Half-Mode SIW Evanescent-Mode Cavity Resonators
摘要： In this paper, for the first time, an ultra-compact frequency-tunable filtering rat-race coupler based on half-mode evanescent-mode (EVA) cavity resonators is presented. Employing EVA cavity resonators in the coupler design yields attractive characteristics, such as a wide tuning range and a wide spurious-free range, while also adding filtering functionality to the device. The presented coupler is synthesized as a two pole bandpass filter using the coupling matrix method. Then, the coupling coefficients are mapped to a coupler topology. Design, simulations, and experimental validation are presented. The implemented rat-race coupler has a very compact size [0.14λg × 0.14λg (λg at 885 MHz)] achieving a 92% miniaturization in the structure footprint compared to the conventional planar one. The coupler has an 86% tuning range ranging between 0.885–1.65 GHz. Throughout the tuning range, the coupler shows an equal power splitting ratio and filtering profile with a measured insertion loss and 3-dB fractional bandwidth between 5 and 4.2 dB and 6.8% and 8%, respectively. The measured isolation is better than 30 dB. In addition, the coupler has a measured spurious-free range of 10.2 fo (at the lowest frequency) to 5.45 fo (at the highest frequency).
关键词： rat-race coupler,tunable resonators,Evanescent-mode (EVA) cavity,tunable coupler,half-mode
更新于2025-09-11 14:15:04
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Nonlinear vibrations of circular single-layer black phosphorus resonators
摘要： A strong nonlinear relationship between the displacement and the load in single-layer black phosphorus sheets (SLBPs) was observed under the large deflection by nanoindentation experiments. However, is rarely considered in the Nano-Electro-Mechanical-System (NEMS) resonators based on the SLBPs. In this letter, nonlinear static and dynamics behaviors of circular SLBPs (CSLBPs) are investigated using molecular dynamics (MD) simulations and a nonlinear orthotropic plate model (NOPM), respectively, where the geometrical nonlinearity is systematically considered in the NOPM. Our results show that the response-frequency curves of forced vibrations in CSLBPs meet clear hardening-type nonlinearity. The damping ratios of CSLBPs are proportional to the square of the vibration amplitude. In particular, the NOPM together with the law of energy equipartition is further utilized to study the nonlinear thermal vibrations of the CSLBPs. Checking against present MD calculations shows that the solution of the present NOPM has high accuracy. The present study should be of great help for designing NEMS resonators based on two-dimensional (2D) orthotropic materials.
关键词： nonlinear orthotropic plate model,black phosphorus,nonlinear vibrations,molecular dynamics,resonators
更新于2025-09-11 14:15:04
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Design of a Modified Single-negative metamaterial structure for sensing application
摘要： A new topology of modified negative effective permeability material (NEPM) are studied by adding a small similar form with different angles to the basic single split-ring resonators. we report our work conducted on the design, simulation and micro-fabrication of sensing system based on a modified split-ring resonator (MSRR) structure around 140 GHz operation frequency. Once the NEPM cells are excited, the reflection and transmission coefficients from the excitation mechanism can be measured by using quasi-optical technique with normal incidence. It has been shown that our proposal NEPM exhibits a high resonant frequency which is extraordinarily sensitive to the changes of the geometries and the properties of metal shape. By applying the new design of square Plus symbol (+) curve to the SRRs, more condensed size and higher sensitivity can be attained compared to conventional SRRs. Furthermore, the enhancement of sensitivity of the new design is also exposed. The considered sample double defect corner square modified form (DCD2) is fabricated in our lab using a conventional printed circuit board process with 2μm aluminum and validated by comparing simulated profiles with measurements.
关键词： sensors,Resonators,Metamaterial,Modified split ring resonators
更新于2025-09-10 09:29:36