# Optical Modulation of BST/STO Thin Films in the Terahertz Range

Optical Modulation of BST/STO Thin Films in the Terahertz Range The $${\hbox{Ba}}_{0.7} {\hbox{Sr}}_{0.3} {\hbox{TiO}}_{3}$$ Ba 0.7 Sr 0.3 TiO 3 (BST) thin film (30.3 nm) deposited on a $${\hbox{SrTiO}}_{3}$$ SrTiO 3 (STO) film/silicon substrate sample was modulated by 532 nm continuous-wave laser in the range of 0.2–1 THz at room temperature. The refractive index variation was observed to linearly increase at the highest 3.48 for 0.5 THz with the pump power increasing to 400 mW. It was also found that the BST/STO sample had a larger refractive index variation and was more sensitive to the external optical field than a BST monolayer due to the epitaxial strain induced by the STO film. The electric displacement–electric field loops results revealed that the increasing spontaneous polarization with the STO film that was induced was responsible for the larger refractive index variation of the BST/STO sample. In addition, the real and imaginary part of the permittivity were observed increasing along with the external field increasing, due to the soft mode hardening. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Journal of Electronic Materials Springer Journals

# Optical Modulation of BST/STO Thin Films in the Terahertz Range

, Volume 47 (7) – Apr 2, 2018
6 pages

/lp/springer_journal/optical-modulation-of-bst-sto-thin-films-in-the-terahertz-range-Ct9b7P0lOI
Publisher
Springer Journals
Subject
Materials Science; Optical and Electronic Materials; Characterization and Evaluation of Materials; Electronics and Microelectronics, Instrumentation; Solid State Physics
ISSN
0361-5235
eISSN
1543-186X
D.O.I.
10.1007/s11664-018-6259-9
Publisher site
See Article on Publisher Site

### Abstract

The $${\hbox{Ba}}_{0.7} {\hbox{Sr}}_{0.3} {\hbox{TiO}}_{3}$$ Ba 0.7 Sr 0.3 TiO 3 (BST) thin film (30.3 nm) deposited on a $${\hbox{SrTiO}}_{3}$$ SrTiO 3 (STO) film/silicon substrate sample was modulated by 532 nm continuous-wave laser in the range of 0.2–1 THz at room temperature. The refractive index variation was observed to linearly increase at the highest 3.48 for 0.5 THz with the pump power increasing to 400 mW. It was also found that the BST/STO sample had a larger refractive index variation and was more sensitive to the external optical field than a BST monolayer due to the epitaxial strain induced by the STO film. The electric displacement–electric field loops results revealed that the increasing spontaneous polarization with the STO film that was induced was responsible for the larger refractive index variation of the BST/STO sample. In addition, the real and imaginary part of the permittivity were observed increasing along with the external field increasing, due to the soft mode hardening.

### Journal

Journal of Electronic MaterialsSpringer Journals

Published: Apr 2, 2018

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