Light Modulation by Polariton Directional-Coupler-Type Devices

Kazuhiko HOSOMI  Masataka SHIRAI  Junji SHIGETA  Tomoyoshi MISHIMA  Toshio KATSUYAMA  

IEICE TRANSACTIONS on Communications   Vol.E82-B   No.8   pp.1243-1247
Publication Date: 1999/08/25
Online ISSN: 
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Joint Special Issue on Recent Progress in Optoelectronics and Communications)
Category: Optical Active Devices and Modules
polariton,  light modulation,  directional-coupler-type device,  

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A GaAs/AlGaAs directional-coupler-type device that use polariton propagation was fabricated and its switching operation was demonstrated. The length of the switching region is as small as 300 µm. The output signal modulation under an electric field shows typical characteristics of directional-coupler type switching. The measured operation voltage is 2 V for an operation wavelength of 805 nm at 10 K. The corresponding signal extinction ratio is 8 dB. These experimental results confirm the efficient operation of the polariton devices, which can be applied to especially small optical -switching devices with low-voltage operation.