Optical Simulation and Analysis of Curved-Waveguide Phase-Change Optical Devices Based on GST Thin Film
This article discusses the optical transmission performances of phase-change optical devices.A bending waveguide model covering Ge2Sb2Te2(GST)thin films was established using the finite difference time domain method.The influences of the GST area,thickness,and position in the bending waveguide on the optical transmission efficiency and loss were obtained in both the crystalline and amorphous states.The results indicated that when the optimal coverage area of the GST was 0.415 μm2,and the thickness was 17 nm,the optical transmission of the device was not affected by the GST position.The maximum contrast of the optical transmission reached 90.8％,and the insertion loss was as low as 0.321 dB.Broadband parallel transmission could be achieved in a wavelength range of 1 500～1 670 nm.The device had a small size and high extinction ratio,which theoretically met the requirement for enhancing the accuracy of optical calculations.This study is significant in the development of non-volatile,parallel integrated photon matrix computing unit devices.
photon computingphase change optical devicesGe2Sb2Te2curved waveguidescovering type
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