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| 1 | Bandpass transmission spectra of a whisperinggallery microcavity coupled to an ultrathin fiber显示文摘Tapered fibers with diameters ranging from 1 to 4 μm are widely used to excite the whispering-gallery(WG)modes of microcavities. Typically, the transmission spectrum of a WG cavity coupled to a waveguide around a resonance assumes a Lorentzian dip morphology due to resonant absorption of the light within the cavity. In this paper, we demonstrate that the transmission spectra of a WG cavity coupled with an ultrathin fiber(500–700 nm)may exhibit both Lorentzian dips and peaks, depending on the gap between the fiber and the microcavity. By considering the large scattering loss of off-resonant light from the fiber within the coupling region, this phenomenon can be attributed to partially resonant light bypassing the lossy scattering region via WG modes, allowing it to be coupled both to and from the cavity, then manifesting as Lorentzian peaks within the transmission spectra.This implies the system could be implemented within a bandpass filter framework. | FUCHUAN LEI RAFINO M.J.MURPHY JONATHAN M.WARD YONG YANG SíLE NIC CHORMAIC | 2017 | Photonics Research2017，5，4： | 1 |
| 2 | Dynamics and entanglement of a membrane-in-the-middle optomechanical system in the extremely-large-amplitude regime显示文摘The study of optomechanical systems has attracted much attention, most of which are concentrated in the physics in the smallamplitude regime. While in this article, we focus on optomechanics in the extremely-large-amplitude regime and consider both classical and quantum dynamics. Firstly, we study classical dynamics in a membrane-in-the-middle optomechanical system in which a partially reflecting and flexible membrane is suspended inside an optical cavity. We show that the membrane can present self-sustained oscillations with limit cycles in the shape of sawtooth-edged ellipses and exhibit dynamical multistability. Then, we study the dynamics of the quantum fluctuations around the classical orbits. By using the logarithmic negativity, we calculate the evolution of the quantum entanglement between the optical cavity mode and the membrane during the mechanical oscillation. We show that there is some synchronism between the classical dynamical process and the evolution of the quantum entanglement. | Ming Gao FuChuan Lei ChunGuang Du GuiLu Long | 2016 | Science China(Physics,Mechanics & Astronomy)2016，59，1： | 1 |
| 3 | Very large group delay in VHF band using coupled high temperature superconducting resonators显示文摘Storing a very high frequency(VHF)band(30–300 MHz)electromagnetic wave has many potential applications,such as phase modulation,buffering,and radio frequency memory.It can be effectively achieved by applying coupled resonator-based electromagnetically induced transparency(EIT)due to its slow light effect.However,the wavelength in the VHF band is too long to design resonators,and the group delay is limited by the high resistive loss of metal.The practical application of EIT in the VHF band is still a big challenge.In this work,we propose and experimentally demonstrate EIT response in a high-temperature superconducting(HTS)microwave circuit with coupled-resonator-induced transparency.The chip size of the HTS circuit is only 34 mm×20 mm with a very low transparency frequency of 198.55 MHz.In addition,we implement very large group delay higher than 12.3μs and 16.2μs with working temperatures of 65 K and 50 K separately,which is much longer than the previous reported works on slow wave.The fabricated circuit is planar with working temperature about 65 K,and thus can be easily integrated into other microwave devices under the cryogenic conditions provided by a commercial portable Stirling cryocooler.Our proposed method paves a way for studying EIT in the microwave region due to the high quality factor of the HTS resonator,which has great potential use for radio-frequency memory in the future. | TIANNING ZHENG BIN WEI FUCHUAN LEI BISONG CAO | 2021 | Photonics Research2021，9，10： | 0 |
| 4 | Blue band nonlinear optics and photodarkening in silica microdevices显示文摘There are extensive studies to date on optical nonlinearities in microcavities at the near and mid-IR wavelengths.Pushing this research into the visible region is equally valuable.Here,we demonstrate a directly pumped,blue band Kerr frequency comb and stimulated Raman scattering(SRS)at 462 nm in a silica nanofiber-coupled whispering gallery microcavity system.Notably,due to the high optical intensities achieved,photodarkening is unavoidable and can quickly degrade the optical quality of both the coupling optical nanofiber and the microcavity,even at very low pump powers.Nonetheless,stable hyperparametric oscillation and SRS are demonstrated in the presence of photodarkening by taking advantage of in-situ thermal bleaching.This work highlights the challenges of silica-based,short wavelength nonlinear optics in high-quality,small mode volume devices and gives an effective method to overcome this apparent limitation,thus providing a baseline for optics research in the blue region for any optical devices fabricated from silica. | KE TIAN JIBO YU FUCHUAN LEI JONATHAN WARD ANGZHEN LI PENGFEI WANG SÍLE NIC CHORMAIC | 2022 | Photonics Research2022，10，9： | 0 |
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