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Microwave magneto-optical properties of metal cladding waveguide structure

Author: WenFeng
Tutor: WuBaoJian
School: University of Electronic Science and Technology
Course: Optical Engineering
Keywords: Magneto-optical Bragg diffraction Microwave magnetostatic wave Metal cladding waveguide
CLC: O482.5
Type: Master's thesis
Year: 2008
Downloads: 46
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Abstract


Magnetostatic wave (MSW) as a controlled slow dispersive wave by non-dispersive delay or linear dispersion ground structure, a multi-layer magnetic film structure and cascade magnetostatic forward wave and backward wave way to get the ideal delay. The static magnetic media - magnetic yttrium iron garnet (YIG) film also has good light transmission capability, magnetostatic wave guided wave interaction possible. Compared with the same type of acousto-optical device having a faster modulation based on the magneto-optical Bragg cell spectral analyzer, optical filters, optical modulators, optical switches and optical communication devices such as microwave, the greater the bandwidth range and simple conversion can design advantages, in terms of a new generation of optical communication, optical information processing and laser radar has a broad application prospects. In order to carry out the optical signal processing based on the magneto-optical Bragg cells, the RF delay performance and guided wave diffraction efficiency of the magneto-optical devices, the paper theoretical analysis of the excitation and propagation of the the magnetostatic wave of the the oblique magnetic metal clad waveguide structure, and three types of magnetostatic wave guided wave magneto-optic Bragg diffraction. The main tasks and innovation: (1) the use of surface permeability method derived an arbitrarily magnetized metal / dielectric / YIG / gadolinium gallium garnet (GGG) / static magnetic wave propagation equation in the metal multilayer dielectric structure and dynamic magnetization strength, and pointed out that according to the distribution characteristics of magneto-optical waveguide magnetostatic potential function to identify different types of magnetostatic wave. In the oblique the magnetization metal cladding waveguide, the magnetostatic surface wave (MSSW) has a richer dispersion characteristics, determine the range of the excitation of magnetostatic surface soliton wave dispersion branch and bandwidth. Designed the cascading magnetostatic forward volume the wave (MSFVW) and reverse wave (MSBVW)'s, non-dispersive delay line system, the system can be obtained by adjusting the direction of the bias magnetic field 500MHz delay the bandwidth and 30ns/cm the adjustable delay time. Analysis of MSW and guided wave phase mismatch features have been simplified in the case of the quasi-phase matching magneto-optical coupled mode equations, and used to calculate the oblique the magnetized metal cladding waveguide three categories magnetostatic wave guided wave coupling. The calculations show that the metal cladding effect can be enhanced in certain magnetostatic wave bandwidth MSSW or MSFVW of guided optical waves in a magneto-optical coupling, and the amount of deviation of the wave number (relative to the traditional sandwich waveguide structure) explained qualitatively metal cladding on the magneto-optical Bragg diffraction efficiency; stimulate the surface of the static magnetic soliton wave dispersion branch waveguide circumstances 8.7dB increase in diffraction efficiency than traditional sandwich can be obtained, which helps to carry out the static magnetic soliton and guided optical waves interaction hot issues research. (5) proposed the concept of the magnetization grating, and magneto-optical coupling theory analysis of the potential applications of the aspects of this grating in the BPSK communication system, grating sensor and the magnetron light switch.

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CLC: > Mathematical sciences and chemical > Physics > Solid State Physics > Solid nature of the > Magnetic properties
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