Article
Optics
Yi Liu, Linyi Wang, Xin Xu, Kai Jiang, Yajun You, Wenjun He, Xuefeng Han, Jiaxin Hou, Xiujian Chou
Summary: A narrow linewidth parity-time (PT) symmetric Brillouin fiber laser based on dual-polarization cavity with single micro-ring resonator is proposed and experimentally investigated. Compared with existing studies, this design achieves PT symmetry without complex cavity structures or ultra-narrow bandpass filters, and demonstrates narrow linewidth and high mode suppression ratio, as well as tunability within a specific wavelength range. This design is of great importance for high coherent communication systems.
Article
Acoustics
Martin Chan, Christian Baker, Daniel Simmons, Mike Goldsmith
Summary: The demand for precision grade MEMSM microphones is rapidly increasing, requiring a reliable and cost-efficient bulk calibration method. This paper presents a pilot version of such a method carried out at the National Physical Laboratory in the UK. The method shows promise as a basis for bulk calibration of precision MEMSMs.
JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA
(2021)
Review
Engineering, Electrical & Electronic
Thomas Szkopek, Eli Martel
Summary: Enhancing energy efficiency of electronics is a significant challenge in semiconductor device physics, especially with the increasing global energy consumption by electronics and growing reliance on information technology. Monolayer graphene, with its low elastic modulus and adhesion energy, is an ideal material for developing electromechanical switches with low-voltage operation. Progress in the development of low-voltage graphene electromechanical switches is reviewed in this article, covering motivation, thermodynamic limits, and the scaling of on/off current ratio with voltage, as well as theoretical models and experimental work towards realizing suspended graphene switches.
PROGRESS IN QUANTUM ELECTRONICS
(2021)
Article
Optics
Wei Cheng, Dongdong Lin, Pengfei Wang, Shangqing Shi, Mengjia Lu, Jin Wang, Chen Guo, Yifei Chen, Zhao Cang, Zhuang Tian, Zien Liang, Guohua Hu, Binfeng Yun
Summary: Bandpass microwave photonic filter can be achieved by using phase modulation and a single micro-ring resonator notch filter. By introducing another micro-ring resonator to handle the other optical sideband, the residual phase can be greatly suppressed, leading to improved performance of the filter. The proposed bandpass microwave photonic filter has been theoretically and experimentally verified, showing improved out-of-band rejection and shape factor compared to a single micro-ring resonator. The bandwidth and center frequency of the filter can be reconfigured and tuned by adjusting the optical carrier's frequency, the amplitude coupling coefficients of the micro-ring resonators, and the resonant wavelengths.
Article
Physics, Fluids & Plasmas
Sang-Bum Jeon, Ji-Hwan Park, Chin-Wook Chung
Summary: Measurement of electron energy distribution function (EEDF) in low-density RF plasmas is improved by development of a new external filter, reducing RF distortion and observing electron heating mode transition.
PLASMA SOURCES SCIENCE & TECHNOLOGY
(2022)
Article
Engineering, Electrical & Electronic
Dimitra Psychogiou, Kunchen Zhao, Roberto Gomez-Garcia
Summary: This letter discusses the RF design and practical realization of dual-bandstop filters with compact size and two independently controlled rejection bands. The filters are based on miniaturized substrate-integrated-coaxial resonant stages and achieve further miniaturization by tuning the center frequency of the bands. Three prototypes were designed, manufactured, and measured to validate the concept.
IEEE MICROWAVE AND WIRELESS COMPONENTS LETTERS
(2021)
Article
Engineering, Electrical & Electronic
Naci Pekcokguler, Dominique Morche, Andreas Burg, Catherine Dehollain
Summary: A low power receiver architecture is proposed to monitor the 2.4 GHz ISM band for communication standards such as WLAN, ZigBee, and BLE. The architecture includes a widely tunable Gm-C CBPF, achieving a frequency shift of +/- 60MHz and a bandwidth range of 5-40MHz. The power consumption ranges from 6.7 mu W to 99.2 mu W.
IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS I-REGULAR PAPERS
(2023)
Article
Engineering, Electrical & Electronic
Jiwei Li, Yue Hu, Xufan Gan, Feng Gao, Wending Zhang, Ligang Huang, Fang Bo, Guoquan Zhang, Jingjun Xu
Summary: The study presented a tunable bandwidth add-drop filter in the ideal quasicritical coupling state, demonstrating stable efficiency, narrow bandwidth, and a wide tuning range in the experiment. The filter has potential applications in microwave photonics, narrow linewidth lasers, and nonlinear optics.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2021)
Article
Chemistry, Analytical
Zhoujing Ye, Ya Wei, Biyu Yang, Linbing Wang
Summary: This paper develops a printed circuit board with three MEMS accelerometer chips for pavement vibration monitoring. The sensing performance of the three MEMS accelerometer chips, including sensitivity, linearity, noise, resolution, frequency response, and temperature drift, was experimentally tested and compared. The results show that the VS1002 has the highest sensitivity and resolution with the best overall performance. This research is important for the development of high-precision and long-life acceleration sensors for pavement vibration monitoring.
Proceedings Paper
Engineering, Electrical & Electronic
Renjun Kuang, Hanyu Xie, Jianzhong Chen, Bian Wu
Summary: This paper presents a design of a tunable suspended substrate stripline bandpass filter with constant absolute bandwidth. The method utilizes hybrid electromagnetic coupling to achieve constant bandwidth as the frequency varies. A tunable filter is designed to validate the method, which has a tunable center frequency and absolute bandwidth over the entire tuning range.
2022 INTERNATIONAL CONFERENCE ON MICROWAVE AND MILLIMETER WAVE TECHNOLOGY (ICMMT)
(2022)
Article
Chemistry, Analytical
Joon Hyong Cho, David Cayll, Dipankar Behera, Michael Cullinan
Summary: The demand for graphene-based devices is rapidly growing, but there are significant challenges in the manufacturing process. Despite recent breakthroughs in basic research, integrating graphene with Micro-Nano Electromechanical Systems remains challenging. Therefore, achieving large-scale, repeatable production is still a major barrier to the commercialization of graphene.
Article
Instruments & Instrumentation
Sushruta Surappa, Tuna Erdogan, F. Levent Degertekin
Summary: In this study, a parametrically driven capacitive electromechanical resonator with multiple electrical degrees of freedom is simulated and experimentally demonstrated. By tuning the electrical circuit parameters, multiple frequency bands of operation are achieved, including nondegenerate parametric resonance. The method allows for operation over a broader range of frequencies compared to purely mechanical approaches and can achieve parametric resonance in the presence of high mechanical damping.
SMART MATERIALS AND STRUCTURES
(2021)
Article
Engineering, Electrical & Electronic
Qianyin Xiang, Hongchun Sun, Mingye Fu, Qiuyan Jin, Quanyuan Feng
Summary: This paper proposes a novel 5th-order cross-coupled tunable bandpass filter based on full-wavelength tunable resonator with four independent coupling regions. The slop of the coupling coefficients versus the resonant frequency is pre-defined to achieve constant bandwidth for the tunable bandpass filter. The filter consists of two cascaded trisection structures with a common resonator to reduce size and generate transmission zeros.
IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS II-EXPRESS BRIEFS
(2023)
Article
Materials Science, Multidisciplinary
Mahmoud A. Farghaly, Vladimir Kartashov, Muhammad Nadeem Akram, Einar Halvorsen
Summary: This article introduces a variational model for the geometrically nonlinear behavior of piezoelectrically actuated MEMS tunable lenses, addressing softening and hardening effects exhibited by the lens during operation. By solving a cubic nonlinear system of equations, the model accurately predicts lens displacement, showing good agreement with FEM simulations and experimental measurements.
JOURNAL OF INTELLIGENT MATERIAL SYSTEMS AND STRUCTURES
(2022)
Article
Engineering, Mechanical
Yumin Zhang, Di Mo, Xue Han, Jiawen Xu, Chunqi Wang, Lixi Huang, Keming Wu
Summary: A sharp and ultra-narrow asymmetrical spectral profile called Fano resonance is formed by interfering a background mode with a local mode, which has widespread applications in various physical areas. However, achieving Fano resonance at a desired frequency requires precise geometries and mechanical properties, posing challenges for its applications. In this study, an electromechanical Fano resonance is achieved by an electromechanical diaphragm shunted by a multiple-branch resonant circuit (SEMD). The local resonance of SEMD is induced by the electrical circuit, allowing digital programming of the Fano resonance through MOSFET switches.
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
(2023)
