Light modulator and wave guide device

Details Light modulator and wave guide device Light modulator and wave guide device

1986-10-09

1989-05-16

Gensler, Paul

350 9614, G02F 129

Patent

active

048304484

ABSTRACT:
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.

REFERENCES:
patent: 4039249 (1977-08-01), Kaminow et al.
patent: 4047795 (1977-09-01), Hughes et al.
patent: 4648687 (1987-03-01), Yoshida et al.
patent: 4685766 (1987-08-01), Nishimura et al.
Optics and Spectroscopy, vol. 45, No. 5, 11/1987, pp. 791-792.

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