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| 1 | Mid-infrared chalcogenide microfiber knot resonators显示文摘A novel type of mid-IR microresonator,the chalcogenide glass(ChG)microfiber knot resonator(MKR),is demonstrated,showing easy fabrication,fiber-compatible features,resonance tunability,and high robustness.ChG micro fibers with typical diameters around 3μm are taper-drawn from As2S3 glass fibers and assembled into MKRs in liquid without surface damage.The measured Q factor of a typical 824μm diameter ChG MKR is about 2.84×104 at the wavelength of 4469.14 nm.The free spectral range(FSR)of the MKR can be tuned from2.0 nm(28.4 GHz)to 9.6 nm(135.9 GHz)by tightening the knot structure in liquid.Benefitting from the high thermal expansion coefficient of As2S3 glass,the MKR exhibits a thermal tuning rate of 110 pm·℃^-1 at the resonance peak.When embedded in polymethyl methacrylate(PMMA)film,a 551μm diameter MKR retains a Q factor of 1.1×10^4.The ChG MKRs demonstrated here are highly promising for resonator-based optical technologies and applications in the mid-IR spectral range. | YU XIE DAWEI CAI HAO WU JING PAN NING ZHOU CHENGUANG XIN SHAOLIANG YU PAN WANG XIAOSHUN JIANG JIANRONG QIU XIN GUO LIMIN TONG | 2020 | Photonics Research2020，8，4： | 3 |
| 2 | Active control of EIT-like response in a symmetry-broken metasurface with orthogonal electric dipolar resonators显示文摘The active control of electromagnetic response in metamaterial and mutual coupling between resonant building blocks is of fundamental importance in realizing high-quality metamaterials. In this work, we propose and experimentally demonstrate the tunabilities of symmetry-broken metasurfaces made of orthogonal electric dipolar resonators. The metasurface with vertical and horizontal wires is integrated with a PIN diode for active control.It is found that the electromagnetically induced transparency(EIT)-like spectrum appears due to the destructive or constructive interferences between the two electric dipolar modes when the structural symmetry broken is introduced to the metasurface. Different from previous works on the EIT-like effect, there is only electric dipole response in our metasuface. The microscopic response of the metasurface is numerically calculated to illustrate the mode coupling between the orthogonal electric dipolar resonators. By applying temporal coupled-mode theory,the interaction between the electromagnetic wave and the symmetry-broken metasurface is described, and the characteristic parameters of the resonator system, which determine the electromagnetic response of the metasurface, are acquired. | RUISHENG YANG QUANHONG FU YUANCHENG FAN WEIQI CAI KEPENG QIU WEIHONG ZHANG FULI ZHANG | 2019 | Photonics Research2019，7，9： | 3 |
| 3 | Analysis of mode characteristics for microcircular resonators confined by different metallic materials显示文摘Mode characteristics of metallically confined microcircular resonators are theoretically studied by solving eigenvalue equations for two-dimensional multilayer structures.The influences of conventional metals including Au,Ag,Cu,Al,and Ti,on the mode wavelengths and Q factors of whispering gallery modes(WGMs) are analyzed and compared.The results show silver has the best optical confinement among these metals,and aluminum presents similar behavior to Au.However,Ti,which is usually applied to enhance the adhesion of p-electrode to semiconductors,results in a great dissipation for confined modes.Furthermore,circular microlasers with Al as both p-electrode and optical confinement medium are fabricated,and continuous-wave operations are realized at room temperature for the microlasers with a radius of 15 μm. | 姚齐峰 黄永箴 杨跃德 肖金龙 | 2016 | Journal of Semiconductors2016，37，12： | 2 |
| 4 | Resonance Characteristics of Piezoelectric Resonator Based on Digital Driving Circuit of Field-Programmable Gate Array显示文摘Piezoelectric resonators are widely used in frequency reference devices, mass sensors, resonant sensors(such as gyros and accelerometers), etc. Piezoelectric resonators usually work in a special resonant mode. Obtaining working resonant mode with high quality is key to improve the performance of piezoelectric resonators. In this paper, the resonance characteristics of a rectangular lead zirconium titanate(PZT) piezoelectric resonator are studied. On the basis of the field-programmable gate array(FPGA) embedded system, direct digital synthesizer(DDS) and automatic gain controller(AGC) are used to generate the driving signals with precisely adjustable frequency and amplitude. The driving signals are used to excite the piezoelectric resonator to the working vibration mode. The influence of the connection of driving electrodes and voltage amplitude on the vibration of the resonator is studied. The quality factor and vibration linearity of the resonator are studied with various driving methods mentioned in this paper. The resonator reaches resonant mode at 330 kHz by different driving methods.The relationship between resonant amplitude and driving signal amplitude is linear. The quality factor reaches over 150 by different driving methods. The results provide a theoretical reference for the efficient excitation of the piezoelectric resonator. | 王振瑜 吴校生 叔晟竹 | 2019 | Journal of Shanghai Jiaotong university(Science)2019，24，1： | 2 |
| 5 | Characterize and optimize the four-wave mixing in dual-interferometer coupled silicon microrings显示文摘By designing and fabricating a series of dual-interferometer coupled silicon microrings, the coupling condition of the pump, signal, and idler beams can be engineered independently and then we carried out both the continuous-wave and pulse pumped four-wave mixing experiments to verify the dependence of conversion efficiency on the coupling conditions of the four interacting beams, respectively. Under the continuous-wave pump, the four-wave mixing efficiency gets maximized when both the pump and signal/idler beams are closely operated at the critical coupling point, while for the pulse pump case, the efficiency can be enhanced greatly when the pump and converted idler beams are all overcoupled. These experiment results agree well with our theoretical calculations. Our design provides a platform for explicitly characterizing the four-wave mixing under different pumping conditions, and offers a method to optimize the four-wave mixing, which will facilitate the development of on-chip all-optical signal processing with a higher efficiency or reduced pump power. | 吴超 刘英文 顾晓文 薛诗川 郁鑫鑫 孔月婵 强晓刚 吴俊杰 朱志宏 徐平 | 2019 | Chinese Physics B2019，28，10： | 1 |
| 6 | A Review of the Building Blocks of Silicon Photonics:From Fabrication Perspective显示文摘Silicon photonics is a disruptive semiconductor technology that taps into the extraordinary properties of light while taking full advantage of the already matured CMOS processes developed in the semiconductor industry.However,just like electronic industry in the 1970s,currently,silicon photonics is in its infancy.The fundamental building blocks of silicon photonics such as waveguides,lasers,modulators,etc.are yet to be fully optimized for low-cost-mass-manufacturing.In this paper,the current state-of-the-art related to developing and optimizing these aforementioned key components will be presented.The challenges of process integration regarding Silicon photonics will also be discussed. | Md Jubayer Shawon Feng Li | 2019 | Semiconductor Science and Information Devices2019，1，1： | 0 |
| 7 | Graphene foam resonators:Fabrication and characterization显示文摘Three-dimensional graphene foams(GFs)benefit from a large surface area and unique physical properties.We present here the first-ever miniaturized GF-based resonators.We developed a simple yet reliable fabrication process,in which GFs are synthesized and assembled on a cavity to form suspended GF devices.We electrostatically excited these devices and analyzed their resonance and ring-down responses.We observed significant energy dissipation,as the quality factor of the devices was in the order of several tens.Additionally,we investigated the influence of temperature on the operation of the devices and found that high temperatures mechanically soften the resonators but also considerably enhance energy dissipation.Finally,our devices demonstrated a mode-coupling of a resonance mode and a mode having twice its frequency.Thus,this work paves the way toward the development of novel GF resonators that could be integrated into future devices,such as GF-based nano-electromechanical sensors,electrical circuits,and oscillators. | Yahav Ben-Shimon Siva KReddy Assaf Ya'akobovitz | 2022 | Nano Research2022，15，1： | 0 |
| 8 | Analyzing electrostatic modulation of signal transduction efficiency in MoS_(2) nanoelectromechanical resonators with interferometric readout显示文摘Optical interferometry is a highly sensitive method for detecting the miniscule resonant motion in two-dimensional(2D)nanoelectromechanical systems(NEMS).However,the technique to control the interferometry signal strength has not been fully understood.In this work,we present analytical modeling of an effective method for tuning motion-to-signal responsivity in interferometric detection of 2D molybdenum disulfide(MoS_(2))NEMS resonators.We show that the responsivity can be tuned very efficiently,all the way from maximum to 0,by varying the vacuum gap underneath the 2D membrane electrostatically.We further show that the gate voltage corresponding to 0 responsivity,which means no motion signal can be detected,varies with the MoS_(2)thickness,diameter,pre-strain,and initial vacuum gap.Our findings provide an important guideline for optimizing measurement conditions when detecting motion in 2D NEMS structures using laser interferometry. | Jiankai ZHU Pengcheng ZHANG Rui YANG Zenghui WANG | 2022 | Science China(Information Sciences)2022，65，2： | 0 |
| 9 | Analysis of CV mode selected resonator based on vectorial eigenvector method显示文摘The vectorial eigenvector method was applied to compute the cylindrical vector(CV) modes of polarization-dependent resonators and multiple modes in the CV mode selected resonator were tracked. Then, the mode characteristics of CV mode selected resonator depending on the Fresnel number, geometry parameters, and polarization parameters were simulated.When the difference in reflection coefficient between radial and azimuthal polarization is greater than 0.021 for spherical semi-confocal cavity, the radially polarized TM01*mode most probably appears in the resonator due to its lowest loss,which is consistent with an azimuthal polarization-selective resonant cavity. Moreover, the appropriate phase shift factor contributes to suppress non-rotationally symmetrical modes, which promotes the selection of CV modes. The Fresnel number between 2 and 2.5 are the appropriate range of values when the value of geometry parameters g2 is 0.5, both of which decide the effective Fresnel number. | 胡友友 窦健泰 罗博伟 贺昌玉 | 2019 | Chinese Physics B2019，28，2： | 0 |
| 10 | Hexagonal boron nitride nanomechanical resonators with spatially visualized motion显示文摘Atomic layers of hexagonal boron nitride(h-BN)crystal are excellent candidates for structural materials as enabling ultrathin,two-dimensional(2D)nanoelectromechanical systems(NEMS)due to the outstanding mechanical properties and very wide bandgap(5.9 eV)of h-BN.In this work,we report the experimental demonstration of h-BN 2D nanomechanical resonators vibrating at high and very high frequencies(from~5 to~70 MHz),and investigations of the elastic properties of h-BN by measuring the multimode resonant behavior of these devices.First,we demonstrate a dry-transferred doubly clamped h-BN membrane with~6.7 nm thickness,the thinnest h-BN resonator known to date.In addition,we fabricate circular drumhead h-BN resonators with thicknesses ranging from~9 to 292 nm,from which we measure up to eight resonance modes in the range of~18 to 35 MHz.Combining measurements and modeling of the rich multimode resonances,we resolve h-BN’s elastic behavior,including the transition from membrane to disk regime,with built-in tension ranging from 0.02 to 2 N m−1.The Young’s modulus of h-BN is determined to be EY≈392 GPa from the measured resonances.The ultrasensitive measurements further reveal subtle structural characteristics and mechanical properties of the suspended h-BN diaphragms,including anisotropic built-in tension and bulging,thus suggesting guidelines on how these effects can be exploited for engineering multimode resonant functions in 2D NEMS transducers. | Xu-Qian Zheng Jaesung Lee Philip X.-L.Feng | 2017 | Microsystems & Nanoengineering2017，3，1： | 0 |
| 11 | Integrated 60-GHz miniaturized wideband metasurface antenna in a GIPD process显示文摘We propose a miniaturized wideband metasurface antenna for 60-GHz antenna-in-package applications.With the glass integrated passive device manufacturing technology,we introduce a coplanar-waveguide-fed(CPW-fed)ring resonator to characterize the material properties of the glass substrate.The proposed antenna is designed on a high dielectric constant glass substrate to achieve antenna miniaturization.Because of the existence of gaps between patch units compared with the conventional rectangular patch in the TM10 mode,the radiation aperture of this proposed antenna is reduced.Located right above the center feeding CPW-fed bow-tie slot,the metasurface patch is realized,supporting the TM10 mode and antiphase TM20 mode simultaneously to improve the bandwidth performance.Using a probe-based antenna measurement setup,the antenna prototype is measured,demonstrating a 10-dB impedance bandwidth from 53.3 to 67 GHz.At 60 GHz,the antenna gain measured is about 5 dBi in the boresight direction with a compact radiation aperture of 0.31λ0×0.31λ0 and a thickness of 0.06λ0. | Hai-yang XIA Jin-can HU Tao ZHANG Lian-ming LI Fu-chun ZHENG | 2020 | Frontiers of Information Technology & Electronic Engineering2020，21，1： | 0 |
| 12 | Optimal Design for Wireless Power Transfer System with Relay Resonators显示文摘The optimization method by adjusting load and distances between two adjacent coils( or resonators) is presented on basis of wireless power transfer( WPT) system with relay resonators. 2-port network and impedance matching theory are applied to analyzing power flow of incidence and reflection in WPT system,then setting up power flow model. The maximum power transmission efficiency can be obtained when the load and distance between secondary resonator and output coil meets impedance matching at 2-port network's output port. The simulation and experimental results shown the impedance matching method can effectively improve and maintain transmission efficiency by adjusting load and distances between coils or relay resonators. | 陈新 黄守道 | 2018 | Journal of Donghua University(English Edition)2018，35，4： | 0 |
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