Mid-infrared Plasmonic Resonances in 2D VO2 Nanosquare Arrays

被引:53
作者
Matsui, Hiroaki [1 ,2 ]
Ho, Ya-Lun [3 ]
Kanki, Teruo [4 ]
Tanaka, Hidekazu [4 ]
Delaunay, Jean-Jacques [3 ]
Tabata, Hitoshi [1 ,2 ]
机构
[1] Univ Tokyo, Dept Bioengn, Bunkyo Ku, Tokyo 1138656, Japan
[2] Univ Tokyo, Dept Elect Engn & Informat Syst, Bunkyo Ku, Tokyo 1138656, Japan
[3] Univ Tokyo, Dept Mech Engn, Bunkyo Ku, Tokyo 1138656, Japan
[4] Osaka Univ, Inst Sci & Ind Res, Osaka 5670047, Japan
关键词
INFRARED-SPECTROSCOPY; TRANSITION; NANOPARTICLES; NANOANTENNAS; GOLD;
D O I
10.1002/adom.201500322
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
Plasmon resonances on 2D nanosquare arrays and their temperature-dependent modulations are demonstrated using the insulator-to-metal transition (IMT) of VO2. A comparison between observed experimental trends and electromagnetic simulations reveals that the plasmon coupling is effective in the periodic 2D alignment of metallic VO2 nanosquares and results in a collective plasmon excitation. This plasmon excitation affects the optical responses of VO2 nanosquares in the mid-infrared (IR) range through reduction of plasmon damping in relation to the specifi c band structure of VO2. This preliminary understanding is important for the elucidation of temperature-dependent plasmon resonances. The IMT of VO2 produces temperature-dependent plasmon resonances with respect to spectral features. The electrodynamic simulations reveal that these phenomena are based on plasmon coupling in the nanosquare array when each nanosquare acts as a single metallic domain. The hysteretic plasmon resonances are derived from resonant coupling between metallic VO2 nanosquares via the IMT nature of VO2, which results in temperature-dependent changes in collective plasmon excitations in the nanosquare array.
引用
收藏
页码:1759 / 1767
页数:9
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