发明名称 |
Light modulator and wave guide device |
摘要 |
A light modulator comprises a stack of a wave guide layer and an adjacent layer normally exhibiting a refractive index smaller than that of the wave guide layer, at least one of these layers being formed of a material whose refractive index changes by application of energy. An energy applicator is provided at least in one of these layers, and a dielectric grating is positioned at the surface of the adjacent layer over a section where energy is applied by the energy applicator. A drive circuit is provided for energizing the energy applicator and causing a change in refractive index to arise in the wave guide layer and/or the adjacent layer so that a wave guided inside of the wave guide layer is radiated out of the stack by interaction with the dielectric grating. In a wave guide device, the wave guide layer is formed of a thermo-optic material in which the thermal coefficient of refractive index is zero or negative, and the adjacent layer is formed of a thermo-optic material exhibiting a positive thermal coefficient of refractive index.
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申请公布号 |
US4830448(A) |
申请公布日期 |
1989.05.16 |
申请号 |
US19860917058 |
申请日期 |
1986.10.09 |
申请人 |
FUJI PHOTO FILM CO., LTD. |
发明人 |
OKAZAKI, YOJI;SUNAGAWA, HIROSHI;KAMIYAMA, KOZI |
分类号 |
G02F1/01;G02F1/295;G06K15/12;H04N1/12 |
主分类号 |
G02F1/01 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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