Electric-field control of surface plmons on Mott-insulator oxides

2017 Fiscal Year Final Research Report

• Project/Area Number: 15K13331
• Research Category: Grant-in-Aid for Challenging Exploratory Research
• Allocation Type: Multi-year Fund
• Research Field: Applied materials
• Research Institution: The University of Tokyo
• Principal Investigator: Matsui Hiroaki 東京大学, 大学院工学系研究科(工学部), 准教授 (80397752)
• Co-Investigator(Kenkyū-buntansha): 神吉 輝夫 大阪大学, 産業科学研究所, 准教授 (40448014) ; J・J Delaunay 東京大学, 大学院工学系研究科(工学部), 准教授 (80376516)
• Project Period (FY): 2015-04-01 – 2018-03-31
• Keywords: 強相関酸化物 / VO2 / 表面プラズモン / 赤外 / モット相転移 / ナノ構造体

Outline of Final Research Achievements

In this challenge, we focus on vanadium dioxides (VO2) with a metal-insulator transition, and carried out external control of surface plasmon excitations in the infrared (IR) range. In particular, this study aimed at clearing mechanism of surface plasmon excitations from experimental and theoretical approaches. VO2 nanodot arrays showed dip structures with clear absorptions within from near- to mid-IR range, which markedly changed optical responses by small thermal energy near 60 degrees. In addition, we demonstrated electric-field control of VO2 nanodot arrays using ultrafast infrared time-resolved spectroscopy, and found surface plasmon dynamics at femtosecond scale.

Free Research Field

酸化物材料科学