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DESIGN OF HIGH-PERFORMANCE SUM-FREQUENCY UPCONVERTOR

ELECTRONICS LETTERS 1991年第22期27卷 2064-2066页

作者： DENG, SF WU, Q QIU, JH Harbin Inst. of Technol. China

A new 8 mm-band sum-frequency upconvertor is described which consists of a double-ridge waveguide, a crossrod structure and varactors. The convertor operates over X, K and Ka bands. The minimum conversion loss is 2.9 dB at a sum frequency of 35 GHz, with bandwidth over 500 MHz. The maximum output power of the sum-frequency signal is 1.34 mw;testing results show that the upconvertor converts the X-band signal to Ka-band linearly.

关键词： CONVERTERS wave-guides DIODES MICROwave DEVICES AND COMPONENTS

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Formation of optical waveguides in KNbO3 by MeV boron ion implantation

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NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS 1997年第2期122卷 253-254页

作者： Xia, ZH Li, Y Shen, DY Wang, XM Ma, XY Shen, DH Wang, KR RES INST SYNTHET CRYSTALS BEIJING 100018PEOPLES R CHINA BEIJING UNIV POSTS & TELECOMMUN DEPT APPL SCI & TECHNOLBEIJING 100088PEOPLES R CHINA

Planar optical wave guides were formed in KNbO3 by MeV boron ion implantation. The experimental results demonstrated that MeV heavy ion implantation in KNbO3 produces optical waveguides with high quality.

关键词： wave-guides He+ implantation Profiles Optical waveguides Boron Ion implantation waveguide Device Component

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Quantum-well intermixing for the control of second-order nonlinear effects in AlGaAs multiple-quantum-well waveguides

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OPTICS LETTERS 1997年第21期22卷 1600-1602页

作者： Street, MW Whitbread, ND Hutchings, DC Arnold, JM Marsh, JH Aitchison, JS Kennedy, GT Sibbett, W UNIV ST ANDREWS DEPT PHYS & ASTRONST ANDREWS KY15 9SSFIFESCOTLAND

We present experimental evidence to demonstrate the feasibility of a promising new quasi-phase-matching technique in AlGaAs multiple-quantum-well waveguides. Non-phase-matched second-harmonic-generation measurements indicate that, for sub-half-bandgap excitation near 1.5 mu m, quantum-well intermixing by impurity-free vacancy disordering results in a reduction of the nonlinear susceptibility chi(zxy)((2)) (similar to 340 pm/V) by 17%. Relatively low intermixed waveguide losses, and the high spatial resolution of the impurity-free vacancy disordering process, suggest that periodic intermixing along the direction of propagation should lead to useful frequency-conversion efficiencies. (C) 1997 Optical Society of America.

关键词： wave-guides SUSCEPTIBILITY GENERATION ALXGA1-XAS CRYSTALS nonlinear effect aluminum gallium arsenides Disease Susceptibility propagation direction waveguide Device Component crystals Generations Quantum wells

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Multiple phase production on doping Er³⁺ into α-Al₂O₃

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CHEMICAL PHYSICS LETTERS 2004年第1-3期399卷 15-19页

作者： Tanner, PA Wong, KL Liang, Y City Univ Hong Kong Dept Biol & Chem Kowloon Hong Kong Peoples R China

Samples of alpha-Al2O3 were prepared by the preformed sol or nitrate-citrate methods and were doped with Er3+ at concentrations from 25 to 0.1 at.%. The luminescence spectra showed the formation of erbium garnet and/or perovskite compounds and no luminescence from Er3+ substituted at Al3+ sites was detected. This contrasts with previous reports, especially the low-temperature luminescence of alpha-Al2O3:Er3+ (1 at.%) which in fact corresponds to ErAlO3, (C) 2004 Elsevier B.V. All rights reserved.

关键词： SOL-GEL METHOD PULSED-LASER DEPOSITION AL2O3 THIN-FILMS OPTICAL-SPECTRA ENERGY-LEVELS CRYSTAL-FIELD wave-guides METAL-IONS LUMINESCENCE PHOTOLUMINESCENCE

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Peptide nanotubes: Simple separation using size-exclusion columns and use as templates for fabricating one-dimensional single chains of an nanoparticles

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ADVANCED MATERIALS 2005年第14期17卷 1753-+页

作者： Gao, XY Djalali, R Haboosheh, A Samson, J Nuraje, N Matsui, H CUNY Hunter Coll Dept Chem & Biochem New York NY 10021 USA CUNY Hunter Coll Grad Ctr New York NY 10021 USA

Straight single chains of An nanoparticles have been synthesized using 10 nm diameter peptide nanotubes as templates (see Figure). The 6 nm An nanoparticles grow in the gaps between the synthetic peptide coating the nanotubes which regulates the size, dispersity, interparticle distance, and crystallinity of the nanoparticles. The use of longer nanotubes results in longer chains.

关键词： HISTIDINE-RICH PEPTIDE ELECTRON TRANSISTORS QUANTUM DOTS NANOCRYSTALGROWTH PACKING DISORDER wave-guides NANOWIRES ARRAYS DNA ELECTROMIGRATION

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Second and third order optical processes in anisotropic polymer waveguides

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SYNTHETIC METALS 2001年第1-3期121卷 1495-1496页

作者： Schrader, S Flueraru, C Dietzel, B Motschmann, H Brehmer, L Univ Potsdam Inst Phys Lehrstuhl Phys Kondensierter Materie D-14469 Potsdam Germany Inst Dunnschichttechnol & Mikrosensorik Teltow D-14513 Teltow Germany Max Planck Inst Kolloid & Grenzflachenforsch D-14476 Golm Germany

Second harmonic generation and linear optical properties of thin layers and optical wave-guides prepared by Langmuir-Blodgett-technique or spin-coating/corona poling from new maleic acid anhydride (MAA) polymers carrying NLO chromophores in the side chain, from polymethylmethacrylate/disperse red host-guest systems and from 2-docosylamino-5-nitropyridine (DCANP) amphiphiles have been studied. We found that high-quality wave-guides with high non-linear optical coefficients can be prepared from all of these materials either by LB or by spin-coating/corona poling. We reached phase matching for special wave guide structures. By computer simulation we evaluated the intensity distribution within wave-guide for the fundamental, second and third harmonic wave based on "coupled amplitude equations".

关键词： non-linear optical methods Langmuir-Blodgett technique wave-guides models of non-linear phenomena

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Optical properties of AgI/Ag infrared hollow fiber in the visible wavelength region

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OPTICS LETTERS 2008年第4期33卷 318-320页

作者： Sui, Ke-Rong Shi, Yi-Wei Tang, Xiao-Li Zhu, Xiao-Song Iwai, Katsumasa Miyagi, Mitsunobu Fudan Univ Dept Commun Sci & Engn Shanghai 200433 Peoples R China Sendai Natl Coll Technol Sendai Miyagi 9893128 Japan

We report on AgI/Ag infrared hollow fiber with low-loss in visible region. Improved methods of silver plating and iodination were proposed to fabricate the hollow fiber. The surface roughness of the silver layer and the silver iodide layer was reduced by the pretreatment with an SnCl2 solution and low iodination temperature. Losses for the Er:YAG and green laser light were 0.4 and 7 dB/m. The loss property of green laser beam was low to deliver a pilot beam for the invisible infrared laser light. Owing to the smooth and uniform AgI film, the loss spectrum of the hollow fiber showed clear interference peaks in the visible region. An empirical formula for AgI material dispersion was derived, which is of special importance for the design of high-performance AgI/Ag hollow fiber. (c) 2008 Optical Society of America.

关键词： wave-guides TRANSMISSION

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REPRESSION AND SPEED IMPROVEMENT OF PHOTOGENERATED CARRIER INDUCED REFRACTIVE NONLINEARITY IN INGAAS/INGAASP QUANTUM-WELL wave-GUIDE

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ELECTRONICS LETTERS 1991年第16期27卷 1447-1449页

作者： PENTY, RV TSANG, HK WHITE, IH GRANT, RS SIBBETT, W WHITEAWAY, JEA UNIV ST ANDREWS DEPT PHYS & ASTRONN HAUGHST ANDREWS KY16 9SSFIFESCOTLAND BNR EUROPE LTD HARLOW CM17 9NAESSEXENGLAND

For the first time, the all-optical refractive nonlinearity due to photogenerated carriers in an InGaAs/InGaAsP quantum well waveguide under various bias conditions is measured. With no bias, the nonlinearity has a slow recovery time, of the order of the recombination time of the carriers. For a coupled power of 4.3 W and a 600-mu-m long device, we measure a phase modulation of 7.5 +/- 2 radians. Under forward bias the nonlinearity is effectively quenched. Under reverse bias the nonlinearity remains, although slightly reduced. In the latter case the recovery time is dramatically reduced to approximately 50 ps.

关键词： wave-guides NONLINEAR OPTICS SEMICONDUCTOR DEVICES AND MATERIALS

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Plasmon Bragg reflectors and nanocavities on flat metallic surfaces

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APPLIED PHYSICS LETTERS 2005年第1期87卷 013107-1-013107页

作者： Wang, B Wang, GP Wuhan Univ Dept Phys Wuhan 430072 Peoples R China

Metal heterostructures constructed surface plasmon polaritons (SPPs) Bragg reflectors and nanocavities on flat metallic surfaces are proposed and demonstrated numerically. A metal heterowaveguide structured by alternately stacking two kinds of metal gap waveguides (MGWs) shows periodically effective refraction index modulation to SPPs and produces SPP propagation on flat metallic surfaces a band gap in certain frequencies, known as plasmonic band gap, in which SPP propagation is forbidden. Changing the width of one MGW in the heterowaveguide, a SPP nanocavity with high quality factor can be created. Our results imply a broad possibility of constructed SPP-based Bragg reflectors, emitter, and filters, etc., on flat metallic surfaces for planar nanometeric photonic networks. (c) 2005 American Institute of Physics.

关键词： wave-guides BAND-GAP LIGHT LASER

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A diffraction-compensating 0-25 ns free space terahertz delay line for coherent quantum control

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REVIEW OF SCIENTIFIC INSTRUMENTS 2007年第11期78卷 113103-1-113103-5页

作者： Allen, D. G. Sherwin, M. S. Takahashi, S. Ramian, G. Univ Calif Santa Barbara Dept Phys Santa Barbara CA 93106 USA Univ Calif Santa Barbara Inst Quantum & Complex Dynam Santa Barbara CA 93106 USA Univ Calif Santa Barbara Inst Quantum & Complex Dynam Dublin 2 Ireland

Free space delay lines provide pulses of variable time spacing for optical experiments such as pump-probe spectroscopy and coherent quantum control, including spin and photon echo techniques. However, in the terahertz region of the spectrum, beam divergence due to diffraction limits the useful length of traditional free space delay lines. We present a novel double-folded variable delay line for light in the frequency range 0.24-1.2 THz, which incorporates a symmetric arrangement of lenses whose spacing can be adjusted to compensate for diffraction at each delay. Scalable for use in other wavelength regimes, the design relays an input Gaussian beam waist to the output with up to 25 ns (similar to 8 m) total delay and is enclosed in a desiccated volume of < 0.5 m(3). The delay line can deliver two or three pulses with relative amplitudes controlled via variable spacing silicon etalon beam splitters. Profiles of a 0.24 THz beam show good agreement with calculations at long delays, with insertion loss per delay stage of similar to 3 dB. (C) 2007 American Institute of Physics.

关键词： wave-guides RADIATION

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