编辑:cgsoft 时间:2017年04月05日 访问次数:2295

Polymer single-nanowire optical sensors谷付星,张磊,殷学锋,童利民2008NANO LETTERS
Fast detection of humidity with a subwavelength-diameter fiber taper coated with gelatin film张磊,谷付星,楼静漪,殷学锋,童利民2008OPTICS EXPRESS
Supported microfiber loops for optical sensing郭欣,童利民2008OPTICS EXPRESS
Modeling endface output patterns of optical micro/nanofibers王姗姗,符建,Min Qiu,黄克己,马哲,童利民2008OPTICS EXPRESS
Wavelength switchable semiconductor laser using half-wave V-coupled cavities何建军,刘德坤2008OPTICS EXPRESS
Widely tunable reflection-type Fabry-Perot interferometer based on relaxor ferroelectric poly(vinylidenefluoride-chlorotrifluoroethylene-trifluoroethylene)甄红宇,叶辉,刘旭,朱德喜,李海峰2008OPTICS EXPRESS
Slow light in a dielectric waveguide with negative-refractive-index photonic crystal cladding何金龙,金毅,洪治,何赛灵2008OPTICS EXPRESS
Theoretical and experimental study of optothermal expansion and optothermal microactuator张冬仙,章海军,刘超,蒋建中2008OPTICS EXPRESS
Freeform LED lens for uniform illumination丁毅,刘旭,郑臻荣,顾培夫2008OPTICS EXPRESS
Band-rejection fiber filter and fiber sensor based on a Bragg fiber of transversal resonant structure陈达如,Yang Tzong-Jer,Jin-Jei Wu,沈林放,Kun-Lin Liao,何赛灵2008OPTICS EXPRESS
Cloaking an object on a dielectric half-space张朴,金毅,何赛灵2008OPTICS EXPRESS
Pulse-shape-free method for long-range three-dimensional active imaging with high linear accuracy张秀达,严惠民,姜艳冰2008OPTICS LETTERS
Mach-Zehnder interferometers assembled with optical microfibers or nanofibers李宇航,童利民2008OPTICS LETTERS
Observation of a nonlinear microfiber resonator范固廉,李宇航,童利民,Grelu P2008OPTICS LETTERS
Improved logarithmic phase mask to extend the depth of field of an incoherent imaging system赵惠,李奇,冯华君2008OPTICS LETTERS
Ultracompact directional couplers realized in InP by utilizing feature size dependent etching时尧成,何赛灵,S.Anand2008OPTICS LETTERS
Interrogation technique for a fiber Bragg grating sensing array based on a Sagnac interferometer and an acousto-optic modulator周斌,管祖光,阎春生,何赛灵2008OPTICS LETTERS
Compact optical short-pass filters based on microfibers陈园,马哲,杨青,童利民2008OPTICS LETTERS
Double-layer fabrication scheme for large-area polymeric photonic crystal membrane on silicon surface by multibeam interference lithography张阿平,Paras N. Prasad,何赛灵2008OPTICS LETTERS
Two-dimensional complete band gaps in one-dimensional metal-dielectric periodic structures张锦龙,姜海涛,Stefan Enoch,Gérard Tayeb,Boris Gralak,Michel Lequime2008APPLIED PHYSICS LETTERS
Highly polarized white-light emission from a single copolymer based on fluorene朱德喜,甄红宇,叶辉,刘旭2008APPLIED PHYSICS LETTERS
Compact 2x2 tapered multimode interference couplers based on SU-8 polymer rectangular waveguides杨柳,杨波,盛振,王剑威,戴道锌,何赛灵2008APPLIED PHYSICS LETTERS
A tunable all-fiber filter based on microfiber loop resonator吴宇,曾旭,侯昌伦,白剑,杨国光2008APPLIED PHYSICS LETTERS
Fabrication of submicron structures in nanoparticle/polymer composite by holographic lithography and reactive ion etching张阿平,何赛灵,Paras N. Prasad2008APPLIED PHYSICS LETTERS
Impact of the self-assembly of multilayer polyelectrolyte functionalized gold nanorods and its application to biosensing李心,钱骏,何赛灵2008NANOTECHNOLOGY
Generation and detection of photonic qutrit states by linear optics陈云天,Bjork G2008QUANTUM INFORMATION & COMPUTATION
A modified coplanar monopole antenna of circular disk with an ultra wide bandwidth from 2.28 similar to 38.2 GHz萨尔曼,熊江,胡骏,何赛灵2008JOURNAL OF ELECTROMAGNETIC WAVES AND APPLICATIONS
Ultrasmall thermally tunable microring resonator with a submicrometer heater on Si nanowires戴道锌,杨柳,何赛灵2008JOURNAL OF LIGHTWAVE TECHNOLOGY
A Small Polymeric Ridge Waveguide With a High Index Contrast胡睿,戴道锌,何赛灵2008JOURNAL OF LIGHTWAVE TECHNOLOGY
Asymmetric TEM00-Mode Cavity for Birefringence-Compensated Two-Rod Solid-State Lasers刘崇,Riesbeck T,Wang X,项震,陈军,Eichler HJ2008IEEE JOURNAL OF QUANTUM ELECTRONICS
Highly efficient and tunable fluorescence of a nanofluorophore in silica/metal dual shells with plasmonic resonance陈学文,何赛灵,Choy WCH2008JOURNAL OF APPLIED PHYSICS
Numerical analysis of silicon-on-insulator ridge nanowires by using a full-vectorial finite difference method mode solver戴道锌,盛振2008JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS
Compensating power depletion due to stimulated Raman scattering in high-power delivery fiber via spectral inversion董鹏,肖晓晟,田雨,高士明,杨昌喜2008JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS
Superlens formed by a one-dimensional dielectric photonic crystal王博文,沈林放,何赛灵2008JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS
Two channels of entangled twin photons generated by quasi-phase-matched spontaneous parametric down-conversion in periodically poled lithium niobate crystals高士明,杨昌喜2008JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS
Ultrasmall Si-nanowire-based polarization rotator王喆超,戴道锌2008JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS
Omnidirectional transmission bands of one-dimensional metal-dielectric periodic structures张锦龙,江海涛,沈伟东,刘旭,厉以宇,顾培夫2008JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS
Field quantization and vacuum effects in a chiral medium沈建其2008JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS
Coherence multiplexing system based on asymmetric mach-zehnder interferometers for Faraday sensors管祖光,何赛灵2008IEEE PHOTONICS TECHNOLOGY LETTERS
A polarization-insensitive 1310/1550-nm demultiplexer based on sandwiched multimode interference waveguides时尧成,Arland S,何赛灵2008IEEE PHOTONICS TECHNOLOGY LETTERS
Proposal for diminishment of the polarization-dependency in a Si-nanowire multimode interference (MMI) coupler by tapering the MMI section戴道锌,何赛灵2008IEEE PHOTONICS TECHNOLOGY LETTERS
High utilization of wavelengths and simple interconnection between users in a protection scheme for passive optical networks陈佳佳,Wosinska L,何赛灵2008IEEE PHOTONICS TECHNOLOGY LETTERS
High-frequency ultrasonic hydrophone based on a cladding-etched DBR fiber laser邵理阳,Lau ST,Dong XY,张阿平,Tam HY,Chan HLW,何赛灵2008IEEE PHOTONICS TECHNOLOGY LETTERS
Design of a polarization-insensitive echelle grating demultiplexer based on silicon nanophotonic wires朱凝,宋军,Wosinski L,何赛灵2008IEEE PHOTONICS TECHNOLOGY LETTERS
Microchanneled Chirped Fiber Bragg Grating Formed by Femtosecond Laser-Aided Chemical Etching for Refractive Index and Temperature Measurements付宏燕,Zhou Kaiming,Saffari Pouneh,Mou Chengbo,Zhang Lin,何赛灵,Ian Bennion2008IEEE PHOTONICS TECHNOLOGY LETTERS
Room-temperature cw and pulsed operation of a diode-end-pumped Tm : YAP laser蔡双双,孔剑,吴波,沈永行2008APPLIED PHYSICS B-LASERS AND OPTICS
Model of pulsed Nd : GSAG laser at 942 nm considering rate equations with cavity structure汪莎,Wang Xin,Kallmeyer Frank,陈军,Hans Eichler2008APPLIED PHYSICS B-LASERS AND OPTICS
Determination of the optical constants of polymer light-emitting diode films from single reflection measurements朱德喜,沈伟东,叶辉,刘旭,甄红宇2008JOURNAL OF PHYSICS D-APPLIED PHYSICS
Manipulating light flow with one-dimensional photonic crystals of an electromagnetically induced transparency medium叶余千,沈建其,金毅2008APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
Microscopic observation and laser-controlled microoptothermal drive mechanism张冬仙,章海军,刘超,蒋建中2008MICROSCOPY RESEARCH AND TECHNIQUE
Reconstructing spectral reflectance by dividing spectral space and extending the principal components in principal component analysis张显斗,徐海松2008JOURNAL OF THE OPTICAL SOCIETY OF AMERICA A-OPTICS IMAGE SCIENCE AND VISION
Appropriate interface termination to improve imaging resolution of multilayered structures in the infrared and optical canalization regime李璇,金毅2008JOURNAL OF THE OPTICAL SOCIETY OF AMERICA A-OPTICS IMAGE SCIENCE AND VISION
Design of reflective projection lens with Zernike polynomials surfaces郑臻荣,孙旭涛,刘旭,顾培夫2008DISPLAYS
Design of an ultrashort Si-nanowaveguide-based multimode interference coupler of arbitrary shape戴道锌,何赛灵2008APPLIED OPTICS
Design of a panoramic annular lens with a long focal length牛 爽,白剑,侯西云,杨国光2008APPLIED OPTICS
Real time diagnosis of transient pulse laser with high repetition by radial shearing interferometer刘东,杨甬英,王琳,卓永模2008APPLIED OPTICS
Optical properties and residual stress of YbF3 thin films deposited at different temperatures王颖,章岳光,陈为兰,沈伟东,刘旭,顾培夫2008APPLIED OPTICS
Optical thin-film reflection filters based on the theory of photonic crystals孙雪铮,沈伟东,盖鑫,顾培夫,刘旭,章岳光2008APPLIED OPTICS
Graded wavelike two-dimensional photonic crystal made of thin films厉以宇,李明宇,顾培夫,郑臻荣,刘旭2008APPLIED OPTICS
Long-period grating fabricated by periodically tapering standard single-mode fiber邵理阳,Zhao J,Dong XY,Lu C,何赛灵2008APPLIED OPTICS
Design of subwavelength corrugated metal waveguides for slow waves at terahertz frequencies王博文,金毅,何赛灵2008APPLIED OPTICS
Superprism effect with a large spatial dispersion and high efficiency in a reflection filter孙雪铮,顾培夫,倪肖勇,李明宇,刘旭,沈伟东,章岳光2008JOURNAL OF OPTICS A-PURE AND APPLIED OPTICS
Theoretical study of microfiber resonator devices exploiting a phase shift范固廉,Philippe Grelu,潘云欣,李宇航,童利民2008JOURNAL OF OPTICS A-PURE AND APPLIED OPTICS
Freeform surface lens design for uniform illumination郝翔,郑臻荣,刘旭,顾培夫2008JOURNAL OF OPTICS A-PURE AND APPLIED OPTICS
Large positive and negative lateral beam displacement in a guided-mode resonant filter罗震岳,刘旭,沈伟东,薛晖,顾培夫2008JOURNAL OF OPTICS A-PURE AND APPLIED OPTICS
Optical low-coherence reflectometry for a distributed sensor array of fiber Bragg gratings刘伟升,管祖光,刘国荣,阎春生,何赛灵2008SENSORS AND ACTUATORS A-PHYSICAL
Investigation on the structural and spectral characteristics of deposited FBG stacks at elevated temperature沈永行2008SENSORS AND ACTUATORS A-PHYSICAL
Momentum transfer between quantum vacuum and anisotropic medium沈建其2008PROGRESS OF THEORETICAL PHYSICS
Multiplexing scheme for self-interfering long-period fiber gratings using a low-coherence reflectometry姜萌,管祖光,何赛灵2008IEEE SENSORS JOURNAL
Investigation of multichannel spatial demultiplexer based on thickness-tapered thin film stacks孙雪铮,刘旭,顾培夫2008OPTICS COMMUNICATIONS
Abrupt change of reflectivity from the strongly anisotropic metamaterial郑国安,刘玉玲2008OPTICS COMMUNICATIONS
Photosensitive post tuning of chalcogenide Te20As30Se50 narrow bandpass filters沈伟东,Cathelinaud.M,Lequime.M,Nazabal.V,刘旭2008OPTICS COMMUNICATIONS
Novel ultrasmall Si-nanowire-based arrayed-waveguide grating interleaver with spirals戴道锌,何赛灵2008OPTICS COMMUNICATIONS
Thermal analysis for a photonic Si ridge wire with a submicron metal heater杨柳,戴道锌,何赛灵2008OPTICS COMMUNICATIONS
A hybrid modeling for the theoretical analysis of reflections in a multimode-interference coupler based on silicon-on-insulator nanowires朱凝,戴道锌,何赛灵2008OPTICS COMMUNICATIONS
Design and optimization of an arbitrarily segmented traveling wave electrode for an ultrahigh speed electroabsorption modulator唐涌波,于弋川,叶余千,Urban Westergren,何赛灵2008OPTICS COMMUNICATIONS
A tunable and reconfigurable microwave photonic filter based on two cascaded modulators and a dispersive medium付宏燕,欧海燕,朱坤,Remb E,何赛灵2008OPTICS COMMUNICATIONS
Influence of spherical aberrations on the performance of dynamically stable resonators刘崇,Riesbeck T,Wang X,葛剑虹,项震,陈军,Eichler HJ2008OPTICS COMMUNICATIONS
The analysis of ray aberration of arbitrary phase mask in the wavefront coding system黄薇薇,叶子,张文字,赵廷玉,余飞鸿2008OPTICS COMMUNICATIONS
Multi-focus color image fusion in the HSI space using the sum-modified-laplacian and a coarse edge map赵惠,李奇,冯华君2008IMAGE AND VISION COMPUTING
Glass nanofibers for micro- and nano-scale photonic devices童利民,Mazur E2008JOURNAL OF NON-CRYSTALLINE SOLIDS
Comment on "Light propagation in the Fresnel region - New numerical approach"张文字,黄薇薇,叶子,赵廷玉,余飞鸿2008OPTICS COMMUNICATIONS
The freeform reflector for uniform rectangular illumination丁益,顾培夫,郑臻荣2008JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS BRIEF COMMUNICATIONS & REVIEW PAPERS
Polymer micro or nanofibers for optical device applications杨青,姜校顺,谷付星,马哲,张江扬,童利民2008JOURNAL OF APPLIED POLYMER SCIENCE
RF magnetron sputtering deposition growth of highly orientated strontium barium niobate thin films李跃甫,叶辉,傅兴海2008ACTA PHYSICA SINICA
The extension effect of point spread function in wavefront coding system due to off-axis illumination赵廷玉,叶子,张文字,余飞鸿2008ACTA PHYSICA SINICA
Optoelectronic properties of the red light-emission chelating electrophosphorescent polymers甄红宇,罗孱,朱德喜,叶辉,王军培2008ACTA PHYSICA SINICA
Influence of spherical aberration of the thermal lens on the mode profile of a large-volume TEM00-mode resonator刘崇,葛剑虹,项震,陈军2008ACTA PHYSICA SINICA
Experimental and theoretical investigation of fused silica rod-fiber phase conjugator汪莎,陈军,童立新,高清松,刘崇,唐淳2008ACTA PHYSICA SINICA
Autofluorescence lifetime imaging of lipofuscin and oxidized melanin in retinal pigment epithelium cells孙怡雯,屈军乐,赵羚伶,许改霞,丁志华,牛憨笨2008ACTA PHYSICA SINICA
The effect of infrared laser-induced micro/nano photothermal expansion and the novel method of photothermal actuation张冬仙,刘超,章海军2008ACTA PHYSICA SINICA
Analysis of the thermal stress in infrared films陈为兰,顾培夫,王颖,章岳光,刘旭2008ACTA PHYSICA SINICA
Study on the property of subwavelength imaging in a metal thin-film structure李明宇,顾培夫,张锦龙,郑臻荣,刘旭2008ACTA PHYSICA SINICA
Investigation on a TEM00-mode dynamic stable resonator with two Nd : YAG rods刘崇,葛剑虹,项震,陈军2008ACTA PHYSICA SINICA
Study of modular transfer function-based optieal low-pass filter evaluation model and experiment戚巽骏,林斌,曹向群,陈钰清2008ACTA PHYSICA SINICA
Microwave-photonic frequency doubling utilising phase modulator and fibre Bragg grating欧海燕,陈彪,付宏燕,朱坤,何赛灵2008ELECTRONICS LETTERS
Fibre-optic load sensor based on polarimetric DBR fibre laser邵理阳,Dong XY,Tam HY,何赛灵2008ELECTRONICS LETTERS
Design and fabrication of compact etched diffraction grating demultiplexers based on alpha-Si nanowire technology宋军,朱凝2008ELECTRONICS LETTERS
Ultra-long-distance FBG sensor system based on spectrum-limited Fourier domain modelocking fibre laser with Raman pumps傅姣姣,刘伟升,陈达如,何赛灵2008ELECTRONICS LETTERS
Dual-wavelength single-longitudinal-mode erbium-doped fibre laser based on fibre Bragg grating pair and its application in microwave signal generation陈达如,付宏燕,刘伟升,魏一振,何赛灵2008ELECTRONICS LETTERS
Low-index-material-based nano-slot waveguide with quasi-Bragg-reflector buffer戴道锌,何赛灵2008ELECTRONICS LETTERS
Study on cerebral microcirculation by Optical Doppler Tomography孟婕,丁志华,杨勇,郭周义2008SCIENCE IN CHINA SERIES G-PHYSICS MECHANICS & ASTRONOMY
Simulating the vector potential of gravitomagnetic monopole using spiral motions of confined spinning particles沈建其2008PHYSICA SCRIPTA
Study of in-situ measurement system for porous alumina film based on AFM and reflectometric interference spectroscopy刘超,张冬仙,章海军2008SPECTROSCOPY AND SPECTRAL ANALYSIS
A novel analyzing method for the signal denoising of DNA Sequencing郑华,王立强,石岩,汪洁,陆祖康2008SPECTROSCOPY AND SPECTRAL ANALYSIS
Comparison of Two Methods to Solve AR Model Parameters of Line Shape Optimized Maximum Entropy Spectral Estimation高晓峰,徐之海2008SPECTROSCOPY AND SPECTRAL ANALYSIS
Microwave photonic filter''s application on the microwave signal generation based on an active mode-locked fiber laser陈达如,傅姣姣2008LASER PHYSICS
Diode End-Pumped Passively Q-Switched Nd:YAG Ceramic Laser with Cr4+:YAG Saturable Absorber孔剑,沈永行2008LASER PHYSICS
Fluorescence emission centres and the corresponding infrared fluorescence saturation in a bismuth-doped silica fibre裘燕青,沈永行2008CHINESE PHYSICS LETTERS
Subwavelength imaging in a one-dimensional metal-dielectric structure李明宇,顾培夫,张锦龙,厉以宇,刘旭2008CHINESE PHYSICS LETTERS
Low profile and small size frequency notched planar monopole antenna from 3.5 to 23.64 ghz萨尔曼,熊江,何赛灵2008MICROWAVE AND OPTICAL TECHNOLOGY LETTERS
A compact ultra-wideband slot antenna with multiple frequency bands (vol 49, pg 3056, 2007)丁婕琛,林志立,应志农,何赛灵2008MICROWAVE AND OPTICAL TECHNOLOGY LETTERS
Multiplexing of fiber Bragg grating pairs for sensing based on optical low coherence technology刘伟升,管祖光2008MICROWAVE AND OPTICAL TECHNOLOGY LETTERS
Circular fractal monopole antenna based on descartes circle theorem for uwb applicationKhan SN,胡骏,熊江,何赛灵2008MICROWAVE AND OPTICAL TECHNOLOGY LETTERS
Numerical simulation of Bell inequality''s violation using optical transverse modes in multimode waveguides符建,高素娟2008CHINESE PHYSICS LETTERS
Novel diplexer using composite right/left-handed transmission lines胡鑫,何赛灵2008MICROWAVE AND OPTICAL TECHNOLOGY LETTERS
Stability research of one kind of high dynamic range imaging system徐进,陈浙泊,倪旭翔,陆祖康2008OPTICAL ENGINEERING
Synthesis and performances of chelating electrophosphorescent polymers based on different ancillary ligands甄红宇,罗孱,朱德喜,叶辉,王军培2008ACTA CHIMICA SINICA
Generalized Edwards transformation and principle of permutation invariance沈建其2008INTERNATIONAL JOURNAL OF THEORETICAL PHYSICS
Four-wave mixing in left-handed materials高士明,何赛灵2008JOURNAL OF NONLINEAR OPTICAL PHYSICS & MATERIALS
Analysis of the mobility properties of capillary electrophoresis with linear polyacrylamide汪洁,王立强,石岩,郑华,陆祖康2008CHINESE JOURNAL OF ANALYTICAL CHEMISTRY
Heat-induced changes of secondary structures of BSA in D2O studied by infrared spectroscopy and window factor analysis袁波2008CHEMICAL JOURNAL OF CHINESE UNIVERSITIES-CHINESE
Synthesis of CdSe quantum dots via paraffin liquid and oleic acid廖宇峰,李文江2008JOURNAL OF ZHEJIANG UNIVERSITY-SCIENCE A
Science Letters: Lattice type transmission line of negative refractive index胡鑫,何赛灵2008JOURNAL OF ZHEJIANG UNIVERSITY-SCIENCE A
Illumination system with compound parabolic retro-reflector for single LCOS panel projection display甑艳坤,叶子,张文字,赵廷玉,余飞鸿2008JOURNAL OF ZHEJIANG UNIVERSITY-SCIENCE A
Studies of surface plasmon resonance sensor using bi-beam differential measurement approach曾翰蓉,王晓萍,张雪姣2008JOURNAL OF ZHEJIANG UNIVERSITY-SCIENCE A
Isotropic negatively-refracting atomic-vapor medium沈建其2008MODERN PHYSICS LETTERS B
Linewidth control by overexposure in laser lithography梁宜勇,杨国光2008OPTICA APPLICATA
Fabrication of gold/silica composite artificial opal by a multiple-step electroplating process李文江,谢菲,孙碳,廖宇峰2008ASIA-PACIFIC JOURNAL OF CHEMICAL ENGINEERING
Incoherent broadband optical pulse generation using an optical gate陈彪,江琼2008CHINESE OPTICS LETTERS
Tissue scattering parameter estimation through scattering phase function measurements by goniometer朱瑛,丁志华,Martial Geiser2008CHINESE OPTICS LETTERS
Focal depth extending using rotational symmetric pupil masks赵廷玉,陈燕平,张文字,叶子,余飞鸿2008CHINESE OPTICS LETTERS
Aberration-free two-thin-lens systems based on negative-index materials林志立,丁婕琛,张朴,何赛灵2008CHINESE PHYSICS B
Injection-switchable erbium-doped fiber laser with two output ports陈达如,秦山,何赛灵2008CHINESE OPTICS LETTERS
A new subdivision technique for grating based on CMOS microscopic imaging袁波,严惠民,曹向群,林斌2008CHINESE OPTICS LETTERS
Stable multi-wavelength erbium-doped fiber laser based on dispersion-shifted fiber and Sagnac loop filter高莹,陈达如,高士明2008CHINESE OPTICS LETTERS
Adaptive optics optical coherence tomography for retina imaging史国华,戴云,王玲,丁志华,绕学军,张雨东2008CHINESE OPTICS LETTERS
A novel methodology for photometric compensation of projection display on patterned screen邹文海,徐海松,Bin Han,Dusik Park2008CHINESE OPTICS LETTERS
Efficient and rigorous modeling of light emission in planar multilayer organic light-emitting diodes陈学文,Choy WCH,何赛灵2008JOURNAL OF DISPLAY TECHNOLOGY