[16a-P07-1~24] 3.11 Nanoscale optical science and near-field optics

[16a-P07-9] Phase-change optical modulator using plasmonic nanogaps

〇Hayate Kato¹, Kotaro Makino², Atsushi Kubo¹ (1.Tsukuba Univ., 2.AIST)

Keywords:

micro optical device,plasmonics,phase change material

In this study, we designed and developed a plasmonic modulator with a high extinction ratio at the optical communication wavelength of 1.55 μm by incorporating the phase-change material Ge₂Sb₂Te₅ (GST) into a metal-insulator-metal (MIM) structure. FDTD simulations showed that elongating and thinning the GST improved the extinction ratio to 13.9 dB. In the experiment, Si waveguides were fabricated on an SOI substrate, and by focusing laser light onto the sample surface, the light input and output via the coupler were demonstrated.