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Synthesis and electro-optic properties of fluorine-containing polyimide 被引量:1
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作者 邱凤仙 周钰明 +2 位作者 杨艳芳 刘举正 曹庄琪 《Journal of Southeast University(English Edition)》 EI CAS 2007年第1期131-134,共4页
The fluorine-containing organic polymer was synthesized from 3, 3', 4, 4'-Bisphenyltetracarboxylic (BPDA), and 2,2-Bis (3-amino-4-hydroxyyphenyl) hexafluoropropane (6FHP). It is a first-step preparation of a p... The fluorine-containing organic polymer was synthesized from 3, 3', 4, 4'-Bisphenyltetracarboxylic (BPDA), and 2,2-Bis (3-amino-4-hydroxyyphenyl) hexafluoropropane (6FHP). It is a first-step preparation of a preimided hydroxy-containing polyimide, followed by the covalent bonding of an active chromophore, dispersed red 19 (DR19), onto the backbone of the polyimide via the Mitsunobu reaction. The nonlinear optical (NLO) containing polyimide was synthesized. The differential scanning calorimeter (DSC)and thermal gravimetric analysis (TGA) exhibited Tg and the temperature Tg at which 5 % mass losses occurring of polymer were 248 and 309 ℃, respectively. A reflective electro-optic (EO) modulator using this polymer was fabricated. The optical nonlinearities were determined to be d33 = 5. 209×10^-9 esu (poling voltage of 3.6 kV, 205 ℃) and d33 =7. 418×10^-9esu (poling voltage of 3. 8 kV, 210 ℃) by the second harmonic generation method in in-situ condition at a fundamental wavelength of 1 064 nm. The EO coefficients 733 of the polymer layer in the EO modulator were determined to be 2. 182 pm/V (poling voltage of 3.6 kV, 205 ℃) and 3. 107 pm/V (poling voltage of 3.8 kV, 210 ℃) at 1064 nm by an attenuated-total-reflection (ATR) method. 展开更多
关键词 nonlinear optical electro-optic property POLYIMIDE
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A High-Performance Silicon Electro-Optic Phase Modulator with a Triple MOS Capacitor 被引量:2
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作者 黄北举 陈弘达 +2 位作者 刘金彬 顾明 刘海军 《Journal of Semiconductors》 EI CAS CSCD 北大核心 2006年第12期2089-2093,共5页
We propose and analyze a novel Si-based electro-optic modulator with an improved metal-oxide-semiconductor (MOS) capacitor configuration integrated into silicon-on-insulator (SOl). Three gate-oxide layers embedded... We propose and analyze a novel Si-based electro-optic modulator with an improved metal-oxide-semiconductor (MOS) capacitor configuration integrated into silicon-on-insulator (SOl). Three gate-oxide layers embedded in the silicon waveguide constitute a triple MOS capacitor structure, which boosts the modulation efficiency compared with a single MOS capacitor. The simulation results demonstrate that the Vπ Lπ product is 2. 4V · cm. The rise time and fall time of the proposed device are calculated to be 80 and 40ps from the transient response curve, respectively,indicating a bandwidth of 8GHz. The phase shift efficiency and bandwidth can be enhanced by rib width scaling. 展开更多
关键词 carrier accumulation plasma dispersion effect electro-optic phase modulator METAL-OXIDE-SEMICONDUCTOR optoelectronic integrated circuit
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Mach-Zehnder Electro-Optic Polymer Modulator with C orona Poled Core Layer 被引量:3
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作者 杨晓红 杜云 +1 位作者 石志文 吴荣汉 《Journal of Semiconductors》 EI CAS CSCD 北大核心 2001年第8期971-974,共4页
A Mach-Zehnder(MZ) electro-optic(EO) modulator are real iz ed,with three optical layers as polymer materials.The functional layer is the co rona poled crosslinkable polyurethane.The ridge waveguide is fabricated by us... A Mach-Zehnder(MZ) electro-optic(EO) modulator are real iz ed,with three optical layers as polymer materials.The functional layer is the co rona poled crosslinkable polyurethane.The ridge waveguide is fabricated by using the spin-coating,poling,photolithography and oxygen reactive ion etching(RIE) techniques.The mode and the modulation properties of these devices are demonstra ted in a micron control system,while the light source works at the wavelength of 1 31 or 1 55 micron. 展开更多
关键词 poled polymer M Z waveguide electro-optic modulator
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Electro-Optical Effect Measurement of Thin-Film Material Using PM Fiber Mach-Zehnder Interferometer
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作者 屠晓光 赵雷 +4 位作者 陈平 陈少武 左玉华 余金中 王启明 《Journal of Semiconductors》 EI CAS CSCD 北大核心 2007年第7期1012-1016,共5页
A polarization-maintaining (PM) fiber Mach-Zehnder (MZ) interferometer has been established to measure the EO effect of very thin film materials with optical anisotropy. Unlike a common MZ interferometer, all the ... A polarization-maintaining (PM) fiber Mach-Zehnder (MZ) interferometer has been established to measure the EO effect of very thin film materials with optical anisotropy. Unlike a common MZ interferometer, all the components are connected via polarization-maintaining fibers. At the same time, a polarized DFB laser with a maximum power output of 10mW is adopted as the light source to induce a large extinction ratio. Here,we take it to determine the electro-optical coefficients of a very thin superlattice structure with GaAs, KTP, and GaN as comparative samples. The measured EO coefficients show good comparability with the others. 展开更多
关键词 electro-optic effect polarization-maintaining fiber Mach-Zehnder interferometer
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High-power electro-optic switch technology based on novel transparent ceramic 被引量:2
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作者 张学娇 叶青 +1 位作者 瞿荣辉 蔡海文 《Chinese Physics B》 SCIE EI CAS CSCD 2016年第3期185-193,共9页
A novel high-power polarization-independent electro-optic switch technology based on a reciprocal structtire Sagnac interferometer and a transparent quadratic electro-optic ceramic is proposed and analyzed theoretical... A novel high-power polarization-independent electro-optic switch technology based on a reciprocal structtire Sagnac interferometer and a transparent quadratic electro-optic ceramic is proposed and analyzed theoretically and experimentally. The electro-optic ceramic is used as a phase retarder for the clockwise and counter-clockwise polarized light, and their po- larization directions are adjusted to their orthogonal positions by using two half-wave plates. The output light then becomes polarization-independent with respect to the polarization direction of the input light. The switch characteristics, including splitter ratios and polarization states, are theoretically analyzed and simulated in detail by the matrix multiplication method. An experimental setup is built to verify the analysis and experimental results. A new component ceramic is used and a non- polarizing cube beam splitter (NPBS) replaces the beam splitter (BS) to lower the ON/OFF voltage to 305 V and improve the extinction ratio by 2 dB. Finally, the laser-induced damage threshold for the proposed switch is measured and discussed. It is believed that potential applications of this novel polarization-independent electro-optic switch technology will be wide, especially for ultrafast high-power laser systems. 展开更多
关键词 SWITCH electro-optic switch laser damage optoelectronic material
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Electro-optical properties cholesteric liquid of polymer stabilized crystal film* 被引量:2
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作者 Ma Ji Zheng Zhi-Gang +1 位作者 Liu Yong-Gang Xuan Li 《Chinese Physics B》 SCIE EI CAS CSCD 2011年第2期295-301,共7页
Liquid crystals (LCs) and polymers are extensively used in various electro-optical applications. In this paper, normal mode polymer stabilized cholesteric LC film is prepared and studied. The effects of chiral dopan... Liquid crystals (LCs) and polymers are extensively used in various electro-optical applications. In this paper, normal mode polymer stabilized cholesteric LC film is prepared and studied. The effects of chiral dopant and monomer concentrations on the electro-optical properties, such as contrast ratio, driving voltage, hysteresis width and response time, are investigated. The reasons of electro-optical properties influenced by the concentrations of the materials are discussed. Through the proper material recipe, the electro-optical properties of polymer stabilized cholesteric LC film can be optimized. 展开更多
关键词 liquid crystal POLYMER electro-optical property cholesteric liquid crystal
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Recent progress in integrated electro-optic frequency comb generation 被引量:2
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作者 Hao Sun Mostafa K.halil +1 位作者 Zifei Wang Lawrence R.Chen 《Journal of Semiconductors》 EI CAS CSCD 2021年第4期5-16,共12页
Optical frequency combs have emerged as an important tool enabling diverse applications from test-and-measurement,including spectroscopy,metrology,precision distance measurement,sensing,as well as optical and microwav... Optical frequency combs have emerged as an important tool enabling diverse applications from test-and-measurement,including spectroscopy,metrology,precision distance measurement,sensing,as well as optical and microwave waveform synthesis,signal processing,and communications.Several techniques exist to generate optical frequency combs,such as mode-locked lasers,Kerr micro-resonators,and electro-optic modulation.Important characteristics of optical frequency combs include the number of comb lines,their spacing,spectral shape and/or flatness,and intensity noise.While mode-locked lasers and Kerr micro-resonators can be used to obtain a large number of comb lines compared to electro-optic modulation,the latter provides increased flexibility in tuning the comb spacing.For some applications in optical communications and microwave photonics,a high degree of integration may be more desirable over a very large number of comb lines.In this paper,we review recent progress on integrated electro-optic frequency comb generators,including those based on indium phosphide,lithium niobate,and silicon photonics. 展开更多
关键词 electro-optic frequency comb generation integrated photonics silicon photonics integrated lithium niobate indium phosphide
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Organic electro-optic polymer materials and organic-based hybrid electro-optic modulators 被引量:1
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作者 Yan Wang Tongtong Liu +3 位作者 Jiangyi Liu Chuanbo Li Zhuo Chen Shuhui Bo 《Journal of Semiconductors》 EI CAS CSCD 2022年第10期28-38,共11页
High performance electro-optic modulator,as the key device of integrated ultra-wideband optical systems,have be-come the focus of research.Meanwhile,the organic-based hybrid electro-optic modulators,which make full us... High performance electro-optic modulator,as the key device of integrated ultra-wideband optical systems,have be-come the focus of research.Meanwhile,the organic-based hybrid electro-optic modulators,which make full use of the advant-ages of organic electro-optic(OEO)materials(e.g.high electro-optic coefficient,fast response speed,high bandwidth,easy pro-cessing/integration and low cost)have attracted considerable attention.In this paper,we introduce a series of high-perform-ance OEO materials that exhibit good properties in electro-optic activity and thermal stability.In addition,the recent progress of organic-based hybrid electro-optic devices is reviewed,including photonic crystal-organic hybrid(PCOH),silicon-organic hy-brid(SOH)and plasmonic-organic hybrid(POH)modulators.A high-performance integrated optical platform based on OEO ma-terials is a promising solution for growing high speeds and low power consumption in compact sizes. 展开更多
关键词 organic electro-optic materials MODULATOR organic-based hybrid modulator heterogeneous integration
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Investigation of the mode splitting induced by electro-optic birefringence in a vertical-cavity surface-emitting laser by polarized electroluminescence 被引量:1
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作者 章杰 俞金玲 +2 位作者 程树英 赖云锋 陈涌海 《Chinese Physics B》 SCIE EI CAS CSCD 2014年第2期457-460,共4页
The mode splitting induced by electro-optic birefringence in a P-I-N InGaAs/GaAs/A1GaAs vertical-cavity surface- emitting laser (VCSEL) has been studied by polarized electroluminescence (EL) at room temperature. T... The mode splitting induced by electro-optic birefringence in a P-I-N InGaAs/GaAs/A1GaAs vertical-cavity surface- emitting laser (VCSEL) has been studied by polarized electroluminescence (EL) at room temperature. The polarized EL spectra with E||[110] and E || [150] directions, are extracted for different injected currents. The mode splitting of the two orthogonal polarized modes for a VCSEL device is determined, and its value increases linearly with the increasing injected current due to electro-optic birefringence; This article demonstrates that the polarized EL is a powerful tool to study the mode splitting and polarization anisotropy of a VCSEL device. 展开更多
关键词 mode splitting electro-optic birefringence vertical-cavity surface-emitting laser polarized elec- troluminescence
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Electro-optical dual modulation on resistive switching behavior in BaTiO3/BiFeO3/TiO2 heterojunction 被引量:1
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作者 Jia-Jia Zhao Jin-Shuai Zhang +4 位作者 Feng Zhang Wei Wang Hai-Rong He Wang-Yang Cai Jin Wang 《Chinese Physics B》 SCIE EI CAS CSCD 2019年第12期292-297,共6页
The novel BaTiO3/BiFeO3/TiO2 multilayer heterojunction is prepared on a fluorine-doped tinoxide(FTO) substrate by the sol–gel method. The results indicate that the Pt/Ba TiO3/BiFeO3/TiO2/FTO heterojunction exhibits s... The novel BaTiO3/BiFeO3/TiO2 multilayer heterojunction is prepared on a fluorine-doped tinoxide(FTO) substrate by the sol–gel method. The results indicate that the Pt/Ba TiO3/BiFeO3/TiO2/FTO heterojunction exhibits stable bipolar resistive switching characteristic, good retention performance, and reversal characteristic. Under different pulse voltages and light fields, four stable resistance states can also be realized. The analysis shows that the main conduction mechanism of the resistive switching characteristic of the heterojunction is space charge limited current(SCLC) effect. After the comprehensive analysis of the band diagram and the P–E ferroelectric property of the multilayer heterojunction, we can deduce that the SCLC is formed by the effect of the oxygen vacancy which is controlled by ferroelectric polarizationmodulated change of interfacial barrier. And the effective photo-generated carrier also plays a regulatory role in resistance state(RS), which is formed by the double ferroelectric layer Ba TiO3/BiFeO3 under different light fields. This research is of potential application values for developing the multi-state non-volatile resistance random access memory(RRAM) devices based on ferroelectric materials. 展开更多
关键词 ferroelectric multilayer heterojunction resistive switching characteristic electro-optical dual modulation multi-state resistance
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Experimental study of electro-optical-switched pulsed Nd:YAG laser 被引量:1
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作者 A Maleki M Kavosh Tehrani +1 位作者 H Saghafifar M H Moghtader Dindarlu 《Chinese Physics B》 SCIE EI CAS CSCD 2016年第3期210-214,共5页
We report the specification of a compact and stable side diode-pumped Q-switched pulsed Nd:YAG laser. We ex- perimentally study and compare the performance of the pulsed Nd:YAG laser in the free-running and Q-switch... We report the specification of a compact and stable side diode-pumped Q-switched pulsed Nd:YAG laser. We ex- perimentally study and compare the performance of the pulsed Nd:YAG laser in the free-running and Q-switched modes at different pulse repetition rates from 1 Hz to 100 Hz. The laser output energy is stabilized by using a special configu- ration of the optical resonator. In this laser, an unsymmetrical concave-concave resonator is used and this structure helps the mode volume to be nearly fixed when the pulse repetition rate is increased. According to the experimental results in the Q-switched operation, the laser output energy is nearly constant around 70 mJ with an FWHM pulse width of 7 ns at 100 Hz. The optical-to-optical conversion efficiency in the Q-switched regime is 17.5%. 展开更多
关键词 side diode-pumped Nd:YAG laser concave-concave resonator electro-optical Q-switched laser
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Electro-Optical Properties of Carbon Nanotubes Obtained by High Density Plasma Chemical Vapor Deposition 被引量:1
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作者 Ronaldo D. Mansano Ana Paula Mousinho 《Materials Sciences and Applications》 2011年第5期381-389,共9页
In this work, we studied the electro-optical properties of high-aligned carbon nanotubes deposited at room temperature. For this, we used the High Density Plasma Chemical Vapor Deposition system. This system uses a ne... In this work, we studied the electro-optical properties of high-aligned carbon nanotubes deposited at room temperature. For this, we used the High Density Plasma Chemical Vapor Deposition system. This system uses a new concept of plasma generation: a planar coil is coupled to an RF system for plasma generation. This was used together with an electrostatic shield, for plasma densification, thereby obtaining high-density plasmas. The carbon nanotubes were deposited using pure methane plasmas. Three methods were used for the surface modification of the sample: reference substrate (silicon wafer only submitted to a chemical cleaning), silicon wafer with surface roughness generated by plasma etching, silicon wafer with a thin iron film and silicon wafer with diamond nano powder used as precursor materials. For each kind of silicon wafer surface, the carbon nanotubes were deposited with two different deposition times (two and three hours). The carbon nanotubes structural characteristics were analyzed by Atomic Force Microscope and Scanning Electronic Microscope. The carbon nanotubes electrical characteristics were observed by Raman Spectroscopy and the carbon nanotubes electro-optical properties were analyzed by current vs voltage electrical measurements and photo-luminescence spectroscopy measurements. The photoelectric effect in the carbon nanotubes were determined by photo-induced current measurements. In this work, we obtained carbon nanotubes with semiconductor properties and carbon nanotubes with metallic properties. The electro-optical effects depend strongly on the substrate preparation and the deposition parameters of the carbon nanotubes. The carbon nanotubes are high aligned and show singular properties that can be used for many applications. 展开更多
关键词 CARBON NANOTUBES CVD Process electro-opticAL Properties
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Electro-optical properties of high birefringence liquid crystal compounds with isothiocyanate and naphthyl group 被引量:1
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作者 彭增辉 王启东 +7 位作者 王少鑫 姚丽双 刘永刚 胡立发 曹召良 穆全全 杨程亮 宣丽 《Chinese Physics B》 SCIE EI CAS CSCD 2017年第9期242-247,共6页
Liquid crystal(LC) compound with isothiocyanate and naphthyl group is an attractive high birefringence LC material,and can be used in optical devices. In this paper, the electro-optical properties of a series of thi... Liquid crystal(LC) compound with isothiocyanate and naphthyl group is an attractive high birefringence LC material,and can be used in optical devices. In this paper, the electro-optical properties of a series of this type of LC compounds were investigated. The melting points and enthalpy values of these LC compounds were higher than those of corresponding compounds with the phenyl group. These compounds exhibited high birefringence with a maximum value of 0.66. Fluorine substitution in the molecular almost does not affect the birefringence value. When these LC compounds with the naphthyl group were dissolved in a commercial LC mixture, the electro-optical properties depending on temperature were investigated. In the low-temperature region, LC mixtures with the naphthyl-group LC compounds exhibited higher viscosity than pure commercial LCs. In the high-temperature region, viscosity values very closely approached each other. When response performance was investigated, figure-of-merit(FoM) values were measured. The Fo M values of LC mixtures containing LC compounds with naphthyl group were lower than those of reference benzene LCs in the low-temperature region. However, in the high-temperature region, the results were reversed. These isothiocyanate LC compounds with naphthyl group can be applied in special fast-response LC device, particularly the ones used under high-temperature conditions. 展开更多
关键词 naphthalene isothiocyanate liquid crystals high birefringence electro-optical property
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Preparation and Microstructural,Structural,Optical and Electro-Optical Properties of La Doped Pmn-Pt Transparent Ceramics 被引量:3
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作者 Fernando Andres Londono Badillo Jose Antonio Eiras +1 位作者 Flavio Paulo Milton Ducinei Garcia 《Optics and Photonics Journal》 2012年第3期157-162,共6页
Transparent relaxor ferroelectric ceramics of the system lanthanum modified lead magnesium niobate have been investigated for a variety of electro-optic properties could make these materials alternatives to (Pb,La)(Zr... Transparent relaxor ferroelectric ceramics of the system lanthanum modified lead magnesium niobate have been investigated for a variety of electro-optic properties could make these materials alternatives to (Pb,La)(Zr,Ti)O3. However, a study that relates the properties in function stoichiometric formula, it has not been analyzed heretofore. Therefore, in this work the effect of A-site substitution of La+3 in the characterization microstructural, structural, optical and electro-optical on (1-x)[Pb(1-3/2y)Lay(Mg1/3Nb2/3)O3]-xPbTiO3 and (1-z)[(1-x)Pb(Mg1/3Nb2/3)O3+xPbTiO3]+zLa2O3 has been performed. It was observed that the properties according to the stoichiometric formula and the PT had a maximum whose behavior was related to the addition of lanthanum in each stoichiometries. 展开更多
关键词 FERROELECTRIC OPTICS TRANSMITTANCE electro-opticAL
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Measurement of Frequency Shift Characteristics Based on LiNbO_3 Waveguide Electro-Optic Intensity Modulator 被引量:1
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作者 Zhou Meng Hui-Juan Zhou Yi Liao Qiong Yao 《Journal of Electronic Science and Technology of China》 2008年第4期449-452,共4页
High-speed and wide-band LiNbO3 waveguide electro-optic intensity modulator has drawn great attention in the field of optical fiber communication and sensor. This paper reports the research results on the measurement ... High-speed and wide-band LiNbO3 waveguide electro-optic intensity modulator has drawn great attention in the field of optical fiber communication and sensor. This paper reports the research results on the measurement of frequency shift characteristics of Mach-Zehnder electro-optic intensity modulator. Two measurement methods of frequency shift characteristics for high and low frequency modulations are studied in theory and experiment and demonstrate different results. The realization of a multi-wavelength optical source based on Mach-Zehnder electro-optic intensity modulator has been introduced. The technique to reach the maximum intensity for interesting shift frequency, particularly for heterodyne detection of Brillouin distributed optical fiber sensing, has been given. 展开更多
关键词 BRILLOUIN electro-optic intensity modulator frequency shift LiNbO3.
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High-speed 2 × 2 silicon-based electro-optic switch with nanosecond switch time
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作者 徐学俊 陈少武 +4 位作者 徐海华 孙阳 俞育德 余金中 王启明 《Chinese Physics B》 SCIE EI CAS CSCD 2009年第9期3900-3904,共5页
A 2 × 2 electro-optic switch is experimentally demonstrated using the optical structure of a Mach-Zehnder interferometer (MZI) based on a submicron rib waveguide and the electrical structure of a PIN diode on s... A 2 × 2 electro-optic switch is experimentally demonstrated using the optical structure of a Mach-Zehnder interferometer (MZI) based on a submicron rib waveguide and the electrical structure of a PIN diode on silicon-on-insulator (SOI). The switch behaviour is achieved through the plasma dispersion effect of silicon. The device has a modulation arm of 1 mm in length and cross-section of 400 nm×340 nm. The measurement results show that the switch has a VπLπ figure of merit of 0.145 V.cm and the extinction ratios of two output ports and cross talk are 40 dB, 28 dB and -28 dB, respectively. A 3 dB modulation bandwidth of 90 MHz and a switch time of 6.8 ns for the rise edge and 2.7 ns for the fall edge are also demonstrated. 展开更多
关键词 SILICON-ON-INSULATOR electro-optic switch plasma dispersion effect switch time
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Low-power electro-optic phase modulator based on multilayer graphene/silicon nitride waveguide
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作者 Lanting Ji Wei Chen +7 位作者 Yang Gao Yan Xu Chi Wu Xibin Wang Yunji Yi Baohua Li Xiaoqiang Sun Daming Zhang 《Chinese Physics B》 SCIE EI CAS CSCD 2020年第8期302-309,共8页
Electro-optic modulator is a key component for on-chip optical signal processing.An electro-optic phase modulator based on multilayer graphene embedded in silicon nitride waveguide is demonstrated to fulfill low-power... Electro-optic modulator is a key component for on-chip optical signal processing.An electro-optic phase modulator based on multilayer graphene embedded in silicon nitride waveguide is demonstrated to fulfill low-power operation.Finite element method is adopted to investigate the interaction enhancement between the graphene flake and the optical mode.The impact of multilayer graphene on the performance of phase modulator is studied comprehensively.Simulation results show that the modulation efficiency improves with the increment of graphene layer number,as well as the modulation length.The 3-dB bandwidth of around 48 GHz is independent of graphene layer number and length.Compared to modulator with two-or four-layer graphene,the six-layer graphene/silicon nitride waveguide modulator can realizeπphase shift at a low-power consumption of 14 fJ/bit when the modulation length is 240μm. 展开更多
关键词 electro-optic modulator GRAPHENE silicon nitride WAVEGUIDE
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Electro-optic Properties of DR1 Doped SiO_2 Organic/inorganic Guest-host Films
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作者 LIU Shao-lin YANG Han JIN Ru-long YAN Zhao-xu YI Mao-bin 《Chemical Research in Chinese Universities》 SCIE CAS CSCD 2009年第5期726-732,共7页
We made a comprehensive investigation on the electro-optic(EO) properties of hybrid sol-gel silica film doped with Dispersed Red 1 dye(DR1/SiO2). An important finding is that the dipoles which don't orient along ... We made a comprehensive investigation on the electro-optic(EO) properties of hybrid sol-gel silica film doped with Dispersed Red 1 dye(DR1/SiO2). An important finding is that the dipoles which don't orient along the direction of corona poling field in the films can be instantaneously poled by alternate modulation electrical field. This instant poling effect results in the EO coefficients dependent on the frequency and intensity of alternate modulation electric field, and some experiments have proved it. We also investigated the electro-optic coefficients and thickness of films at different stir temperatures(Ts) of start solution and at different number densities of DR1. Experimentally the DR1 number density was optimized to an order of 1021/cm^3 and a large EO coefficient of γ33= 37 pm/V for DR1/SiO2 film was measured by simple reflection technique at 1 kHz frequencies of modulation electric field. These findings may benefit the practical application of DR1/SiO2 films in the field of EO modulator and EO probing. 展开更多
关键词 electro-optic DR1/SiO2 Instant poling Number density Frequency
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Control Schemes for Driving Electro-optic Array Beam Deflectors
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作者 GONG Xiang-dong LI Jing-zhen YANG Jing XU Ping HUANG Hong-bin 《Semiconductor Photonics and Technology》 CAS 2006年第1期67-72,共6页
The beam deflectors based on electro-optic phased array(EOPA) is mainly described, and then an analysis on existing control schemes for driving the EOPA beam deflectors, based on custom hard-wired electronics or bas... The beam deflectors based on electro-optic phased array(EOPA) is mainly described, and then an analysis on existing control schemes for driving the EOPA beam deflectors, based on custom hard-wired electronics or based on software in a microcontroUer, is made. Compared with these, a driving and control system for a multi-channel EOPA beam deflector is presented, in which the control assignment is implemented with a field programmable gate array(FPGA) chip. For different performance requirements, two control schemes, one with the serial scheme and another with the parallel scheme, have been explored and rapidly prototyped in Xilinx FPGA chips. With the control structures for the EOPA beam deflector, scanning rates of 588 kHz and 5 MHz can be respectivelv reached. 展开更多
关键词 Beam deflection electro-optic phased array Driving control Rapidly prototyping
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Electro-optic Sampling of Proton-bombarded GaP Crystal
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作者 ZHANGDa-ming TIANXiao-jian 《Semiconductor Photonics and Technology》 CAS 2000年第2期77-82,共6页
An electro-optic sampling system utilizing proton-bombarded GaP crystal as probe material has been built. Microwave signals propagating on the indium -tin oxide coplanar waveguide were measured by the system. Measurem... An electro-optic sampling system utilizing proton-bombarded GaP crystal as probe material has been built. Microwave signals propagating on the indium -tin oxide coplanar waveguide were measured by the system. Measurements of bombarded sample gave the resistance value of four orders greater than that of un- bombarded. The electric field shield effect induced by doped GaP was effectively decreased to approximate semi-insulator material. The system has the voltage sensitivity of about 40 mV/21/Hz with the microwave frequency of 1.15 GHz. 展开更多
关键词 Proton bombardment electro-optic sampling Gain-switched semiconductor laser
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