Soon Xin Gan, Kok Bin Ng, Jing Wen Chew, Lian Seng Tey, Wen S.I.N. Chong, Wu Yi Chong, Boon Tong Goh, Choon Kong Lai, Steve Madden, Duk-Yong Choi, Harith Ahmad
The low optical loss of Ge2Sb2Se4Te1 (GSST) makes it a potential functional material for all-optical multilevel photonics memory devices that can operate in the optical telecommunication wavelength band. However, the same characteristic also restricted the tolerance of GSST phase change conditions using 1550 nm as an excitation light source. This work reports on the enhancement of GSST phase change condition tolerance using a graphene oxide (GO) intermediate layer on a polymer waveguide platform. The hybrid waveguide exhibits an insertion loss of around 1 dB and a maximum readout contrast of 25% between amorphous and crystalline states, with a step increase in readout contrast of around 5% per step. This work serves as a proof of concept for the implementation of a GSST–GO hybrid structure as an optical functional material in all-optical photonics memory applications. © 2022 Optica Publishing Group.
Photonics Research Centre, Physics Department, Universiti Malaya, Kuala Lumpur, 50603, Malaysia; Low Dimensional Material Research Center, Physics Department, Universiti Malaya, Kuala Lumpur, 50603, Malaysia; Laser Physics Centre, Research School of Physics, The Australian National University, Canberra, 2601, ACT, Australia; Department of Physics, Faculty of Mathematics and Natural Sciences, Universitas Negeri Malang, Jalan Semarang 5, Malang, 65145, Indonesia