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International Conference on Solid State Devices and Materials (SSDM)

Optical Bistable Devices by Charge-Induced Self-Feedback: Switching Time and Spatial Resolution

George Hayashi, Yoshifumi Yamaoka, Syuji Kodama, Masamichi Yamanishi, Yong Lee, Ikuo Suemune

Published Aug 28, 1991• 0 citations
Publisher
DOI
10.7567/ssdm.1991.d-2-5

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We consider an optically bistable scheme based on growing absorption and equipped with an additional lateral feedback loop. Mathematical model of this device is proposed and analyzed. We demonstrate the simultaneous transfer to instability of steady states that belong to upper and lower branches of the bistable media characteristic curve. This stability loss may cause either self-switching of the scheme from one steady state to another or generation of autooscillations. The latter may be used for the formation of pulse sequences with given duration. We show that adding several loops instead of one sufficiently decreases the input intensity, necessary for switching. The role of diffusion processes in pulse formation is discussed, and the spatially non-uniformal stationary solutions are demonstrated.
Optical bistability has the potential to emulate the capabilities of electrical flip-flops, offering plenty of applications in optical signal processing. Conventional optical bistable devices operate by altering the susceptibility of a nonlinear medium. This method, however, often results in drawbacks such as large device size, high energy consumption, or long switching times. This work proposes an optical bistable device incorporating strong optical feedback into a Fano laser. This leads to multiple stable states and introduces a region of bistability between the inherent Fano mode and a feedback-induced Fabry-Perot mode. Unlike conventional bistable devices, the Fano system exploits strong field localization in a nanocavity to control the properties of one of the laser mirrors. This configuration means that switching states can be achieved by modulating the mirror's loss rather than changing the susceptibility of the active medium. Importantly, modulation can be implemented locally on a nanocavity, bypassing the need to adjust the entire laser system. This leads to fast flip-flop actions with low energy consumption. The feedback Fano laser can be embodied in a compact microscopic structure, thus providing a promising approach towards integrated all-optical computation and on-chip signal processing.