Abstract

Multilayered structures of GeTe and ${\mathrm{Sb}}_2{\mathrm{Te}}_3$ phase change material, also referred to as interfacial phase change memory (iPCM), provide superior performance for nonvolatile electrical memory technology in which the atomically controlled structure plays an important role in memory operation. Here, we report on terahertz (THz) wave generation measurements. Three- and 20-layer iPCM samples were irradiated with a femtosecond laser, and the generated THz radiation was observed. The emitted THz pulse was found to be always $p$ polarized independent of the polarization of the excitation pulse. Based on the polarization dependence as well as the flip of the THz field from photoexcited ${\mathrm{Sb}}_2{\mathrm{Te}}_3$ and ${\mathrm{Bi}}_2{\mathrm{Te}}_3$, the THz emission process can be attributed to the surge current flow due to the built-in surface depletion layer formed in $p$-type semiconducting iPCM materials.

© 2019 Optical Society of America

GaTe–Sb₂Te₃ thin-films phase change characteristics

Marek Bouška, Virginie Nazabal, Jan Gutwirth, Tomáš Halenkovič, Jan Přikryl, Simone Normani, and Petr Němec
Opt. Lett. 45(5) 1067-1070 (2020)

Improving the reflectance and color contrasts of phase-change materials by vacancy reduction for optical-storage and display applications

Jianbo Wang, Qian Li, Shuaipeng Tao, Zhoubo Xia, Yuankai Li, Yan Liu, Zhiqing Gu, and Chaoquan Hu
Opt. Lett. 45(1) 244-247 (2020)

Dissipative soliton generation in Er-doped fiber laser mode-locked by Sb₂Te₃ topological insulator

Jakub Boguslawski, Grzegorz Sobon, Rafal Zybala, and Jaroslaw Sotor
Opt. Lett. 40(12) 2786-2789 (2015)

Near-infrared modulation by means of GeTe/SOI-based metamaterial

E. Petronijevic, G. Leahu, V. Di Meo, A. Crescitelli, P. Dardano, G. Coppola, E. Esposito, I. Rendina, M. Miritello, M. G. Grimaldi, V. Torrisi, G. Compagnini, and C. Sibilia
Opt. Lett. 44(6) 1508-1511 (2019)

Crafting a 1.5 µm pixel pitch spatial light modulator using Ge₂Sb₂Te₅ phase change material [Invited]

Yong-Hae Kim, Seong M. Cho, Kyunghee Choi, Chi Young Hwang, Gi Heon Kim, Sanghoon Cheon, and Chi-Sun Hwang
J. Opt. Soc. Am. A 36(12) D23-D30 (2019)