- 标题
- 摘要
- 关键词
- 实验方案
- 产品
-
Spin-wave excitation and critical angles in a hybrid photon-magnon-coupled system
摘要： We studied “strongly enhanced” excitations of magnetostatic spin-waves in a hybrid magnon-photon-coupled system consisting of an inverted split-ring resonator and an yttrium iron garnet film. The backward-volume magnetostatic wave, magnetostatic surface wave, forward-volume magnetostatic wave modes, as well as multiple mixed modes were observed according to the direction of externally applied magnetic fields with respect to the spin-wave propagation direction. From experimental measurements, we found that there exist certain characteristic angles, which is to say, critical angles (θc), whereby the group velocity of the excited spin-wave modes reaches zero, along with a single ferromagnetic resonance peak. Furthermore, we analytically derived the critical angles as sin θc = (Heff /H){2 ? (1 + μ0Ms/Heff )sin2 fc}1/2, where Heff is the effective magnetic-field strength, H the externally applied field strength, and μ0Ms is the saturation magnetization. This analytical form is in quantitative agreement with estimations from experimentally observed spin-wave modes. This work not only provides a better understanding of multiple-mode spin-wave excitations in given field directions with the help of photon-magnon coupling, but also offers better coupling controllability based on the change of the external magnetic field direction.
关键词： inverted split-ring resonator,critical angles,photon-magnon coupling,spin-wave,yttrium iron garnet
更新于2025-09-23 15:19:57
-
Superconducting Filter Based on Split Ring Resonator Structures
摘要： A design of high-temperature superconducting (HTS) bandpass filter (BPF) based on split ring resonator (SRR) structures is presented in this paper. The SRR has been considered as a classical element for metamaterials and exhibits characteristics of subwavelength resonator, hence can aid in the compact design of filters. Filter has been simulated and optimized using Sonnet software. The measured results of the filter have good consistency with the simulated results and show good band pass characteristics. The center frequency of the filter measured at 70K was 2.515GHz, the rectangle coefficient was 1.22, and the insertion loss was 0.1dB at the center frequency.
关键词： high-temperature superconducting,bandpass filter,split ring resonator,metamaterial
更新于2025-09-19 17:15:36
-
[IEEE 2018 18th Mediterranean Microwave Symposium (MMS) - Istanbul, Turkey (2018.10.31-2018.11.2)] 2018 18th Mediterranean Microwave Symposium (MMS) - Wideband Quarter Wave Transformer Based on Defected Ground and Split Ring Resonator Structures
摘要： This article examines a wideband impedance transformer based on a split ring resonator and defected ground structures. The transformer was designed as a 4-section binomial one and it provides a transformation from 50 Ω to 100 Ω. Reversed “Z” shaped defects are formed on the ground plane of the design in order to increase the bandwidth. The design has been simulated using a 3D electromagnetic simulator which utilizes finite integration technique. Three distinct resonances are exhibited at specific frequency spots as proofs of the concept of impedance matching. Theoretical and simulated results are in a good agreement with each other and the proposed design might be tailored in many microwave circuits and antenna applications.
关键词： broadband,quarter wave transformer,defected ground,split ring resonator
更新于2025-09-19 17:15:36
-
Split-ring resonator-based compact microstrip antenna
摘要： Compact microstrip antennas based on split-ring resonator (SRR) structure are proposed and fabricated in this paper. The resonant frequency of the antennas is discussed upon different geometric structures. The influencing mechanism of the antenna parameters on resonant frequency is analyzed. The analytical and experimental analyses are carried out and proved that the resonant frequency can be controlled from 13.5 GHz to 17.2 GHz by tuning some of the crucial parameters. A good agreement between the simulations and the measurement results suggests that the proposed antenna can be designed at different resonant frequencies while maintaining a small-size, low-profile structure and good performance.
关键词： Microstrip antenna,split-ring resonator,resonant frequency tunable.
更新于2025-09-19 17:15:36
-
Compact eight-channel wavelength demultiplexer using modified photonic crystal ring resonators for CWDM applications
摘要： An eight-channel wavelength demultiplexer by cascading of ring resonators (RRs) in photonic crystal (PhC) structure is proposed in this paper. In designing of this demultiplexer, we used eight square-shaped PhC RRs with different refractive index (RI) of defect rods to generate a distinctive resonance wavelength. Each PhC RR has a specific resonance wavelength with tuning a variety of design parameters such as RI of a whole, defect and inner rods and radius of defect rods. In operating wavelength of λ0 = 1497 nm, the transmission power and quality factor (Q) of single RR are discovered as 96% and 1000, respectively. The average power transmission, channel spacing, crosstalk and full width at half maximum are found by finite difference time domain method to be about 96 ± 1%, 2.25 nm, ? 35 dB and 1.5 nm, respectively. Simulation outcomes demonstrate that the designed demultiplexer has a proper operation. The footprint of the designed device is about ~ 115 μm2, which makes this device a promising for future photonic integrated circuits.
关键词： Photonic crystal,Square shape ring resonator,Wavelength demultiplexer
更新于2025-09-19 17:13:59
-
[IEEE 2019 IEEE 16th International Conference on Group IV Photonics (GFP) - Singapore, Singapore (2019.8.28-2019.8.30)] 2019 IEEE 16th International Conference on Group IV Photonics (GFP) - High Resolution Silicon Nitride Spectrometer by Integrating Micro-Rings and Arrayed Waveguide Gratings in Tandem
摘要： We demonstrate a high-resolution spectrometer on silicon nitride by integrating micro-ring resonators and arrayed waveguide gratings (AWG) in tandem. The integrated spectrometer has an overall size of 1.4*1.1 mm2 and spectral resolution of 0.75nm within the 75nm free spectral range of the secondary AWG.
关键词： Very near infrared,Micro-ring resonator,High-resolution,Arrayed waveguide grating
更新于2025-09-16 10:30:52
-
[IEEE 2019 IEEE 16th International Conference on Group IV Photonics (GFP) - Singapore, Singapore (2019.8.28-2019.8.30)] 2019 IEEE 16th International Conference on Group IV Photonics (GFP) - Towards Transparent on-Waveguide Electrical Circuits in SiN-Photonic Platform
摘要： We demonstrate transparent electrical conductors over SiN waveguides using metallic carbon nanotubes (CNTs). For an optimal coverage of 2 % over a SiN micro-ring resonator (MRR), negligible change in transmission is observed till a current density of 35 μA/μm.
关键词： SiN waveguides,micro-ring resonator,current density,metallic carbon nanotubes,transparent electrical conductors
更新于2025-09-16 10:30:52
-
[IEEE 2019 18th International Conference on Optical Communications and Networks (ICOCN) - Huangshan, China (2019.8.5-2019.8.8)] 2019 18th International Conference on Optical Communications and Networks (ICOCN) - Time Delay Signature Suppression of Chaos in a Semiconductor Laser Subject to Feedback from Parallel-Coupled Triple Ring Resonator
摘要： We numerically demonstrated a time delay signature suppressed chaos generation scheme by using external-cavity semiconductor laser subject to feedback from parallel-coupled triple ring resonator. Simultaneously, the effective bandwidth of chaos can be also extended obviously.
关键词： Time delay signature,Triple ring resonator,Chaos
更新于2025-09-16 10:30:52
-
[IEEE 2018 Asia Communications and Photonics Conference (ACP) - Hangzhou (2018.10.26-2018.10.29)] 2018 Asia Communications and Photonics Conference (ACP) - Nondestructive Measurement of Polarization Characteristics of Fiber-Pigtailed Waveguide-type Ring Resonators
摘要： The polarization analysis model of the waveguide-type ring resonator (WRR) is built and four misaligned angles can be obtained without destruction. The polarization extinction ratio improvement of the lightwave out from the WRR is analyzed.
关键词： polarization extinction ratio,waveguide-type ring resonator,resonant micro-optic gyro
更新于2025-09-16 10:30:52
-
[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) - Multi-core Fiber Technology supporting MIMO and Photonic Beamforming in 5G Multi-Antenna Systems : (Invited paper)
摘要： This paper describes and experimentally validates different multi-antenna system applications supported by a multi- core fiber (MCF) optical fronthaul. The MCF fronthaul enables the simultaneous transmission of different optical data streams at the same wavelength by the spatial multiplexing of multiple-input multiple-output (MIMO) signals. In addition, the MCF enables simultaneous radio beamforming by transmitting the same optical data signal with different phase or time delays to each antenna element. Both MIMO and beamforming capabilities are required for 5G multi-antenna systems. Experimental demonstrations of 4×4 MIMO transmission and multi-beam 4×1 beamforming using a commercially available 4-core fiber are reported in this work. Optical beam-steering in 5G is achieved using a Si3N4 photonic chip based on optical ring resonators (ORRs) that enables the continuous and centralized tuning of the time delay applied to each antenna element.
关键词： integrated photonics,beamforming,MIMO,Multi-core fiber,multi-antenna systems,radio beam-steering,optical ring resonator (ORR)
更新于2025-09-16 10:30:52