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Toward implantable devices for angle-sensitive,lens-less,multifluorescent,single-photon lifetime imaging in the brain using Fabry-Perot and absorptive color filters

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Light(Science & Applications) 2022年第2期11卷 197-211页

作者： Adriaan J.Taal Changhyuk Lee Jaebin Choi Björn Hellenkamp Kenneth L.Shepard Columbia University-Department of Electrical Engineering 500W.120th St.Mudd 1310New York 10027 NYUSA Korea Institute of Science and Technology-Brain Science Institute 5 Hwarang-ro 14-gilSeongbuk-guSeoul 02792Republic of Korea

Implantable image sensors have the potential to revolutionize *** to their small form factor requirements;however,conventional filters and optics cannot be *** limitations obstruct highresolution imaging of large neural *** advances in angle-sensitive image sensors and single-photon avalanche diodes have provided a path toward ultrathin lens-less fluorescence imaging,enabling plenoptic sensing by extending sensing capabilities to include photon arrival time and incident angle,thereby providing the opportunity for separability of fluorescence point sources within the context of light-field microscopy(LFM).However,the addition of spectral sensitivity to angle-sensitive LFM reduces imager resolution because each wavelength requires a separate pixel ***,we present a 1024-pixel,50μm thick implantable shank-based neural imager with color-filtergrating-based angle-sensitive *** angular-spectral sensitive front end combines a metal–insulator–metal(MIM)Fabry–Perot color filter and diffractive optics to produce the measurement of orthogonal light-field information from two distinct colors within a single *** result is the ability to add independent color sensing to LFM while doubling the effective pixel *** implantable imager combines angular-spectral and temporal information to demix and localize multispectral fluorescent *** this initial prototype,this is demonstrated with 45μm diameter fluorescently labeled beads in scattering *** lifetime imaging is exploited to further aid source separation,in addition to detecting pH through lifetime changes in fluorescent *** these initial fluorescent targets are considerably brighter than fluorescently labeled neurons,further improvements will allow the application of these techniques to in-vivo multifluorescent structural and functional neural imaging.

关键词： filters lifetime angle

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Surface acoustic wave photonic filters with a single narrow radio-frequency passband in standard silicon on insulator

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Photonics Research 2022年第7期10卷 1723-1730页

作者： MOSHE KATZMAN MAAYAN PRIEL INBAR SHAFIR SAAWAN KUMAR BAG DVIR MUNK NAOR INBAR MOSHE FELDBERG TALI SHARABANI LEROY DOKHANIAN MATAN SLOOK AVI ZADOK Faculty of Engineering Bar-Ilan UniversityRamat-Gan 5290002Israel Institute for Nano-Technology and Advanced Materials Bar-Ilan UniversityRamat-Gan 5290002Israel Soreq NRC Yavne 81800Israel Tower Semiconductors Migal Ha’Emek 2310502Israel

Integrated microwave photonic filters are becoming increasingly important for signal processing within advanced wireless and cellular *** with narrow transmission passbands mandate long time delays,which are difficult to accommodate within photonic *** delays may be obtained through slow moving acoustic waves *** radio-frequency information can be converted from one optical carrier to another via surface acoustic waves and filtered in the ***,the transfer functions of previously reported devices consisted of multiple periodic passbands,and the selection of a single transmission band was not *** this work,we demonstrate surface acoustic wave,silicon-photonic filters of microwave frequency with a single transmission *** filter response consists of up to 32 tap coefficients,and the transmission bandwidth is only7 *** results extend the capabilities of integrated microwave photonics in the standard silicon-on-insulator platform.

关键词： filters pass microwave

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Design and development of a lightweight cryogenic system for high temperature superconducting(HTS)filters subsystem

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Science China(Technological Sciences) 2022年第3期65卷 735-739页

作者： DUAN YanBo WANG Jue WANG Wei WU ShanShan QI HaoYing WANG ZeKun FANG ChuShu HUANG RongJin LI LaiFeng ZHOU Yuan CAS Key Laboratory of Cryogenics Technical Institute of Physics and ChemistryChinese Academy of SciencesBeijing 100190China University of Chinese Academy of Sciences Beijing 100049China Songshan Lake Materials Laboratory Dongguan 523808China CASIC Space Engineering Development Co.Ltd. Beijing 100854China

Since the discovery of high temperature superconducting(HTS)materials in the 1980 s,HTS filters and motors have developed rapidly[1,2].The extremely low insertion loss and frequency selectivity of the HTS filter make it possible to greatly improve the signal receiving sensitivity and suppress interference ***,it has great potential in aerospace application,satellite communications,mobile base stations,deep space exploration,radar,and other fields[3,4].

关键词： filters high insertion

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Mn-Ce-Nb-O_x/P84 catalytic filters prepared by a novel method for simultaneous removal of particulates and NO

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Journal of Rare Earths 2019年第3期37卷 273-281页

作者： Bo Yang Qiong Huang Mindong Chen Yuesong Shen Shemin Zhu Jiangsu Collaborative Innovation Center of Atmospheric Environment and Equipment Technology (CICAEET) Jiangsu Key Laboratory of Atmospheric Environment Monitoring and Pollution Control School of Environmental Science and Engineering Nanjing University of Information Science & Technology Jiangsu National Synergetic Innovation Center for Advanced Materials (SICAM) College of Materials Science and Engineering Nanjing Tech University

The Mn-Ce-Nb-O_x/P84 catalytic filter for removal of particulates and NO simultaneous was prepared by a novel method(foam coating method). The process parameters including the concentrations of PTFE emulsion, particle size of catalyst and calcination temperature for preparation of catalytic filters were analyzed. In addition, the physical properties and performance for removal of NO(NH_3-SCR) and particulates of Mn-Ce-Nb-O_x/P84 catalytic filter prepared under the optimized parameters, were also systematic studied. Results show that the process parameters had significant influences on stability and performance of catalytic filter, The Mn-Ce-Nb-O_x/P84 catalytic filter prepared by foam coating method under the optimized parameters, has satisfactory physical properties and catalytic performance for removal of NO and particulates at 140-220 ℃. The NO removal efficiency of catalytic filter can reach95.3% at 200 ℃ as the catalyst loading amount is 450 g/m^2, Moreover,the dust removal efficiency of MnGe-Nb-O_x/P84 catalytic filter reaches as high as 99.98%, and the PM2.5 removal efficiency also reaches99.98%. The anti-sulfur performance of Mn-Ce-Nb-O_x catalytic filter is also attractive, after injecting150 ppm SO_2, the NO removal efficiency still retains up to 85%. It is indicated that the foam coating method can not only make a bond of high strength between catalyst and filter, but also make the catalytic filter possessing an excellent and stable performance for removal of NO and particulates.

关键词： Foam coating method Simultaneous removal Mn-Ce-Nb-O_x/P84 catalytic filters NO Particulates Preparation method

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Decorative near-infrared transmission filters featuring high-efficiency and angular-insensitivity employing ID photonic crystals

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Nano Research 2019年第3期12卷 543-548页

作者： Chengang Ji Chenying Yang Weidong Shen Kyu-Tae Lee Yueguang Zhang Xu Liu L.Jay Guo Department of Electrical Engineering and Computer Science The University of Michigan Ann Arbor Michigan 48109 USA State Key Laboratory of Modern Optical Instrumentation Department of Optical Engineering Zhejiang University Hangzhou 310027 China Department of Physics Inha University Incheon 22212 Republic of Korea

We present a new scheme for visibly-opaque but near-infrared-transmitting filters involving 7 layers based on one-dimensional ternary photonic crystals, with capabilities in reaching nearly 100% transmission efficiency in the near-infrared region. Different decorative reflection colors can be created by adding additional three layers while maintaining the near-infrared transmission performance. In addition, our proposed structural colors show great angular insensitivity up to ±60° for both transverse electric and transverse magnetic polarizations, which are highly desired in various fields. The facile strategy described here involves a simple deposit!on method for the fabrication, thereby having great potential in diverse applications such as image sensors, anti-counterfeit tag, and optical measurement systems.

关键词： near-infrared (NIR)-transmitting filters colored decorations photonic crystals multilayer structures

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Integrated flat-top reflection filters operating near bound states in the continuum

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Photonics Research 2019年第11期7卷 1314-1322页

作者： Leonid L.Doskolovich Evgeni A.Bezus Dmitry A.Bykov Image Processing Systems Institute-Branch of the Federal Scientific Research Centre"Crystallography and Photonics"of Russian Academy of Sciences Samara 443001Russia Samara National Research University Samara 443086Russia

We propose and theoretically and numerically investigate narrowband integrated filters consisting of identical resonant dielectric ridges on the surface of a single-mode dielectric slab waveguide. The proposed composite structures operate near a bound state in the continuum(BIC) and enable spectral filtering of transverseelectric-polarized guided modes propagating in the waveguide. We demonstrate that by proper choice of the distances between the ridges, flat-top reflectance profiles with steep slopes and virtually no sidelobes can be obtained using just a few ridges. In particular, the structure consisting of two ridges can optically implement the second-order Butterworth filter, whereas at a larger number of ridges, excellent approximations to higher-order Butterworth filters can be achieved. Owing to the BIC supported by the ridges constituting the composite structure, the flat-top reflection band can be made arbitrarily narrow without increasing structure size. In addition to the filtering properties, the investigated structures support another type of BIC-the Fabry–Perot BIC-arising when the distances between adjacent ridges meet the Fabry–Perot resonance condition. In the vicinity of the Fabry–Perot BIC, an effect similar to electromagnetically induced transparency is observed, namely, sharp transmittance peaks against the background of a wide transmittance dip.

关键词： filters Butterworth filtering

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Photonic microwave filters with ultra-high noise rejection [Invited]

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Chinese Optics Letters 2019年第3期17卷 12-17页

作者： Xihua Zou Peixuan Li Wei Pan Lianshan Yan School of Information Science and Technology Southwest Jiaotong University

As a key figure-of-merit for high-performance microwave filters, the out-of-band noise rejection is of critical importance in a wide range of applications. This paper overviews the significant advances in photonic microwave filters(PMFs) having ultra-high rejection ratios for out-of-band noise suppression over the last ten ***, two types of PMFs, the bandpass and bandstop ones, are introduced with fundamental principles,detailed approaches, and then cutting-edge results for noise rejection. Ultra-high noise rejection ratios of ～80 d B and >60 dB have been demonstrated for single-passband and single-stopband PMFs, respectively, which are comparable with the state-of-the-art electronic filters operating in stringent conditions. These PMFs are also characterized by wide frequency coverage, low frequency-dependent loss, and strong immunity to electromagnetic interference due to the intrinsic features from the advanced photonics technology.

关键词： Photonic microwave filters with ultra-high noise rejection [Invited]

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Guided Mode Resonance Transmission filters Working at the Intersection Region of the First and Second Leaky Modes

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Chinese Physics Letters 2012年第2期29卷 214-216页

作者： MA Jian-Yong FAN Yong-Tao Shanghai Institute of Fine Mechanics and Optics Chinese Academy of SciencesShanghai 201800

Based on the guided mode resonance effect,single-layer transmission filters are *** is found that there is an intersection region in which the strong modulation waveguide modes TE_(0) and TE_(2) can be simultaneously excited by the second and first diffraction orders,respectively.A very high transmission peak emerges when the leaky modes interact with each *** on the normalized eigen-function of a single-layer waveguide grating,the high resonance transmission filters can be designed at any central *** order to demonstrate this concept,we design narrow line-shaped band pass filters with a central wavelength at 0.8,1.06 and 10.6μm.

关键词： waveguide filters narrow

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Tunable filters based on an SOI nano-wire waveguide micro ring resonator

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Journal of Semiconductors 2011年第8期32卷 65-69页

作者：李帅吴远大尹小杰安俊明李建光王红杰胡雄伟 Optoelectronics Research and Development Center Institute of SemiconductorsChinese Academy of Sciences

Micro ring resonator（MRR） filters based on a silicon on insulator（SOI） nanowire waveguide are fabricated by electron beam photolithography（EBL） and inductive coupled plasma（ICP） etching *** cross-section size of the strip waveguides is 450×220 nm2,and the bending radius of the micro ring is around 5μ*** test results from the tunable filter based on a single ring show that the free spectral range（FSR） is 16.8 nm and the extinction ratio（ER） around the wavelength 1550 nm is 18.1 *** thermal tuning,the filter＇s tuning bandwidth reaches 4.8 nm with a tuning efficiency of 0.12 nm/℃Meanwhile,we fabricated and studied multi-channel filters based on a single ring and a double *** measurement,we drew the following conclusions： during the signal transmission of multi-channel filters,crosstalk exists mainly among different transmission channels and are fairly distinct when there are signals input to add ports.

关键词： SOI micro ring resonator thermo-optic effect filters crosstalk

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Angular Tolerance Enhancement in Guided-Mode Resonance filters with a Photonic Crystal Slab

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Chinese Physics Letters 2012年第3期29卷 91-93页

作者： LI Cheng-Guo GAO Yong-Hao XU Xing-Sheng State Key Laboratory of Optoelectronics Institute of SemiconductorsChinese Academy of SciencesBeijing 100083

Two different triple-layer guided-mode resonance(GMR)filters with photonic crystal(PC)slab structures are designed,and their main optical properties are *** is shown that under normal incidence,the PC slab GMR filters exhibit narrower bandwidth,a more symmetric line shape,and larger angular tolerance,compared with the planar grating GMR *** rod-slab type GMR filter works better than the hole-slab *** resonance wavelength location and the angular tolerance can be tuned by varying the *** angular tolerance with narrow bandwidth can be improved by increasing the ratio of the periods in the two crossed directions.

关键词： filters Crystal narrow

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