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Bound states in two-dimensional crossed or bent quantum wires

INTERNATIONAL JOURNAL OF MODERN PHYSICS B 1998年第19期12卷 1907-1919页

作者： Razavy, M Univ Alberta Inst Theoret Phys Dept Phys Edmonton AB T6G 2J1 Canada

The method of conformal transformation is applied to solve the bound state problem for two-dimensional crossed wires with sharp and with smooth circular corners, for T-shaped and L-shaped wires and a number of other geometries. It is shown that in this method the wave equation with Dirichlet boundary condition on the boundaries of these wires can be transformed to a Schrodinger equation with a unique two-dimensional energy-dependent noneseparable potential. The results for various geometries indicate that sharp corners are essential in generating the bound states.

关键词： wave-guides Propagating modes Tubes Rope propagating mode Agrostis ELECTRIC WIRE bound states quantum wires waveguide Device Component Sharp corners CONFORMAL MAPPING Schrodinger equation wave equation

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Band gap of the spectrum in periodically curved quantum waveguides

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JOURNAL OF DIFFERENTIAL EQUATIONS 1998年第1期142卷 123-166页

作者： Yoshitomi, K Osaka Univ Dept Math Osaka 560 Japan

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Characteristic analysis of absorptive multiple-quantum-well optical waveguides

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JOURNAL OF MODERN OPTICS 1998年第2期45卷 249-255页

作者： Ma, CS Jilin Univ Dept Elect Engn Natl Integrated Optoelect Lab Changchun 130023 Peoples R China

By extending the transfer matrix technique from the real domain to the complex, the complex eigenvalue equation is presented for both transverse electric and transverse magnetic modes of absorptive multiple-quantum well optical waveguides, and a computer program is developed to solve the eigenvalue equation in the complex plane. On the basis of the computed results, the effects of the structural parameters and the refractive index profile on the mode propagation and loss properties are analysed and discussed for InxGa1-xAs/AlyGa1-yAs absorptive multiple-quantum-well optical waveguides. The results indicate that, if approximate guided structural parameters and an appropriate refractive index profile are selected, higher-order modes can be controlled and single-mode propagation can be realized in the multiple-quantum-well optical waveguide with lower mode loss.

关键词： wave-guides Refractive-index Optical waveguides refractive index profile transverse magnetic mode index profile transverse electric intrinsic equation real number field computer programs single-mode Complex Plane waveguide Device Component complex refractive index

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Resonant modes of two-dimensional photonic bandgap cavities determined by the finite-element method and by use of the anisotropic perfectly matched layer boundary condition

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JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS 1998年第8期15卷 2316-2324页

作者： Hwang, TK Hyun, SB Ryu, HY Lee, YH Korea Adv Inst Sci & Technol Dept Phys Taejon 305701 South Korea

The finite-element approach to the eigenmode analysis of a photonic bandgap cavity by use of an anisotropic perfectly matched layer absorbing boundary is presented. This method rigorously calculates the resonant frequency, the field pattern, and the quality factor of the resonant mode of a finite-sized cavity in free space. The validity of the approach is examined through its application to two-dimensional photonic bandgap cavities. Analyses of numerical error for the resonant frequencies and the quality factor of the cavities demonstrate the accuracy and reliability of our approach, which used nonuniform grids, higher-order elements, and the perfectly matched layer. Far-field patterns of the resonant modes were obtained by simple transformation. Because the perfectly matched layer can represent the real boundary condition well, cavities of any size and shape can be analyzed with the desired accuracy. (C) 1998 Optical Society of America [S0740-3224(98)00908-4] OCIS codes: 140.3410, 230.3670, 000.4430, 230.5750, 260.2110.

关键词： Gap materials wave-guides Crystals Bends

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Segmented photorefractive waveguides in LiNbO₃:Fe

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JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS 1998年第7期15卷 2006-2012页

作者： Matoba, O Inujima, T Shimura, T Kuroda, K Univ Tokyo Inst Ind Sci Minato Ku Tokyo 106 Japan

We propose what is, to our knowledge, a novel technique for fabricating a segmented waveguide by optical irradiation in a photorefractive LiNbO3:Fe crystal. The waveguide consists of many localized high-refractive-index regions that are fabricated by illumination of a focused laser beam. We fabricate straight, curved, and Y-branch waveguides. In the straight waveguides the transmitted power of a guided beam as a function of the period of segmentation and the dark decay time are measured. The tolerance for fabrication errors is also investigated both experimentally and numerically. The fabricated waveguide can be optically modified. We demonstrate that a curved structure can be transformed into a Y-branch structure. (C) 1998 Optical Society of America.

关键词： wave-guides Lithium-niobate

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Controllable branching of optical beams by quasi-two-dimensional dark spatial solitons

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JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS 1997年第11期14卷 2869-2876页

作者： Neshev, D Dreischuh, A Dinev, S Windholz, L UNIV SOFIA DEPT QUANTUM ELECTBG-1164 SOFIABULGARIA

A variable number of quasi-two-dimensional dark spatial solitons of adjustable transverse velocities could be generated by a proper choice of the initial phase profile (odd or even) and the width of the crossed dark stripes and the background-beam intensity. The possibility of branching a single input probe beam into ordered structures of subbeams is demonstrated numerically in a bulk self-induced-defocusing Kerr nonlinear media. The energy-density branching efficiency for each subbeam is evaluated and discussed. (C) 1997 Optical Society of America.

关键词： KERR NONLINEAR MEDIA VORTEX SOLITONS wave-guides Y-JUNCTIONS PULSES PROPAGATION INSTABILITY STRIPES FIBERS COMPRESSION Fiber Solitons light beams waveguide Device Component branches compression Y junction darkness

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Uniform upconversion in high-concentration Er3+-doped soda lime silicate and aluminosilicate glasses

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OPTICS LETTERS 1997年第11期22卷 772-774页

作者： Hehlen, MP Cockroft, NJ Gosnell, TR Bruce, AJ Nykolak, G Shmulovich, J LUCENT TECHNOL MURRAY HILLNJ 07974

Uniform upconversion in erbium-doped silicate glasses is investigated as a function of glass composition, concentration, and fabrication method. Comparisons of upconversion coefficients are made among soda lime silicate and aluminosilicate bulk glasses and soda lime silicate waveguides. Comparisons are also made with studies performed by other researchers. The results indicate that both the composition and the preparation method of the glass affect the value of the upconversion coefficient, with as much as a factor-of-4 variation observed at fixed Er3+ concentration. Values of the upconversion coefficient are found to be consistent with the Forster-Dexter microscopic model. (C) 1997 Optical Society of America.

关键词： COOPERATIVE UP-CONVERSION EXCITED-STATE ABSORPTION DOPED FIBER AMPLIFIERS wave-guides 980 NM MECHANISMS soda lime Upconversion Excited state absorption waveguide Device Component Silicates

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1 x 8 Supergrating wavelength-division demultiplexer in a silica planar waveguide

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OPTICS LETTERS 1997年第21期22卷 1627-1629页

作者： Fu, XL Fay, M Xu, JM Department of Electrical and Computer Engineering University of Toronto Ontario M5S 1A4 Canada

wavelength-division demultiplexing by superimposed gratings (supergrating) in a planar waveguide is modeled, accounting for intergrating coupling, and a theoretical decoupling criterion that serves as a guideline for practical design is presented. Superimposed gratings were formed by direct photoinscription in a photosensitive silica planar waveguide, which is a promising method for practical optical circuit applications. A 1 x 8 channel wavelength-division multiplexer is demonstrated experimentally as a proof-of-concept study. The effects on experimental performance of wavelength-selectivity broadening and finite photosensitive index-modulation depth are discussed. (C) 1997 Optical Society of America.

关键词： wave-guides

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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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