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The Ge2Sb2Te5 phase-change alloy (GST) is known for its dramatic complex refractive index (and electrical) contrast between its amorphous and crystalline phases. Switching between such phases is also non-volatile and can be achieved on the nanosecond timescale. The combination of GST with the widespread SiN integrated optical waveguide platform led to the proposal of the all-optical integrated phase-change memory, which exploits the interaction of the guided mode evanescent field with a thin layer of GST on the waveguide top surface. The relative simplicity of the architecture allows for its flexible application for data storage, logic gating, arithmetic and neuromorphic computing. Read operation relies on the transmitted signal optical attenuation, due to the GST extinction coefficient. Write/erase operations are performed via the same optical path, with a higher power ad-hoc pulsing scheme, which locally …
International Society for Optics and Photonics
Publication date: 
26 Feb 2020

Emanuele Gemo, Santiago García-Cuevas Carrillo, Joaquin Faneca, Carlota Ruíz de Galarreta, Hasan Hayat, Nathan Youngblood, A Baldycheva, Wolfram HP Pernice, Harish Bhaskaran, C David Wright

Biblio References: 
Volume: 11289 Pages: 112891E
Photonic and Phononic Properties of Engineered Nanostructures X