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Proceedings Paper

Thermal Expulsion As A New Mechanism For Optical Bistability In Prism Coupling Into Planar Wavegaides
Author(s): P. Pirani; V. Briguet; W. Lukosz
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Paper 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 PR. (see Fig. 1).

Paper Details

Date Published: 1 January 1987
PDF: 2 pages
Proc. SPIE 0813, Optics and the Information Age, (1 January 1987); doi: 10.1117/12.967216
Show Author Affiliations
P. Pirani, Swiss Federal Institute of Technology (Switzerland)
V. Briguet, Swiss Federal Institute of Technology (Switzerland)
W. Lukosz, Swiss Federal Institute of Technology (Switzerland)

Published in SPIE Proceedings Vol. 0813:
Optics and the Information Age

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