Thermal Expulsion As A New Mechanism For Optical Bistability In Prism Coupling Into Planar Wavegaides

P. Pirani; V. Briguet; W. Lukosz

doi:10.1117/12.967216

1 January 1987 Thermal Expulsion As A New Mechanism For Optical Bistability In Prism Coupling Into Planar Wavegaides

P. Pirani, V. Briguet, W. Lukosz

Proceedings Volume 0813, Optics and the Information Age; (1987) https://doi.org/10.1117/12.967216
Event: 14th Congress of the International Commission for Optics, 1987, Quebec, Canada

Abstract

We investigated theoretically and experimentally a new type of cptical bistability (0B) in prism coupling into absorbing planar waveguides. Origin of this (B is the thermal expansion of the substrate (and the waveguiding film) and of the prism, due to heating by the part P = P of the incoupled power which is absorbed in the incoupling region. This expansion causes a reduction in the width d of the air gap between the prism coupler and the waveguide in the ompling region. Since the incoupling efficiency is a function of d, positive feedback, and therefore as, can occur. At the same input power Pa, the system has two bistable states, which differ in gap width d, in absorbed power Pa, and consequently in output (reflected) power P_R. (see Fig. 1).

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P. Pirani, V. Briguet, and W. Lukosz "Thermal Expulsion As A New Mechanism For Optical Bistability In Prism Coupling Into Planar Wavegaides", Proc. SPIE 0813, Optics and the Information Age, (1 January 1987); https://doi.org/10.1117/12.967216

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