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Springer proceedings in physics

Bistable Optical Device Using Guided Mode Excitation in Silicon on Sapphire

Fabrice Pardo, A. Köster, H. Chelli, Nicole A. Paraire, S. Laval

Published Jan 1, 1986• 2 citations
Publisher
DOI
10.1007/978-3-642-46580-2_24

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The device uses a cristalline silicon film, grown an a sapphire substrate, as nonlinear material. The film is considered as an optical waveguide, in which the excitation light is coupled by a diffraction grating etched on the silicon surface. The grating is covered with a silver layer to get better field enhancement in the waveguide. Light is then incident through the sapphire substrate. For an incidence angle slightly different from the resonance value, the guided mode is weakly excited at low incident power. As power increases, refractive index variations yield better excitation of the mode and bistable operation is predicted.
Nonlinear semiconductor waveguides are investigated with respect to their use for optical bistability and temporal optical switching with results given for silicon-on-sapphire devices. The performance of the waveguides is assessed with comparisons to nonlinear Fabry-Perot cavities, and the conditions for optical bistability are theoretically shown to be possible by combining a waveguide and a diffraction-grating coupler. Structures experimentally investigated include semiconductor layers epitaxially grown on substrates having low refractive indices. Optical switching is reported on reflected or transmitted beams and on the guided-wave intensity by means of excitation pulses in the nanosecond or picosecond range. The data confirm the usefulness of nonlinear waveguides as alternative devices for temporal optical switching and logic-gate development in part due to their good switching times.