Design, optimization, and performance evaluation of GSST clad low-loss non-volatile switches

摘要

In this paper, we investigate the performance of a self-sustained ON-OFF switch incorporating a new phase change material Ge2Sb2Se4Te1 (GSST) with a silicon rib waveguide at the telecommunication wavelength 1.55 mu m. A full-vectorial H-field finite-element method is used to find the effective index and modal loss of the quasi-TE modes in the GSST-Si waveguide. Both the electro-refraction and electro-absorption type design are studied, and the effects ofGSST thickness and Si slab thickness on the device performance are presented. These results suggest that a GSST-Si rib waveguide with a 500 nm wide Si core, 60-90 nm Si slab thickness, and 40-60 nm GSST layer could be a realistic switch design that can yield a wry compact, 5 mu m long device with only 0.135 dB total insertion loss and more than 20 dB extinction ratio. (C) 2019 Optical Society of America