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Mid‐infrared Plasmonic Resonances in 2D VO 2 Nanosquare Arrays
Author(s) -
Matsui Hiroaki,
Ho YaLun,
Kanki Teruo,
Tanaka Hidekazu,
Delaunay JeanJacques,
Tabata Hitoshi
Publication year - 2015
Publication title -
advanced optical materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.89
H-Index - 91
ISSN - 2195-1071
DOI - 10.1002/adom.201500322
Subject(s) - plasmon , materials science , localized surface plasmon , excitation , infrared , quasiparticle , surface plasmon resonance , coupling (piping) , surface plasmon , condensed matter physics , optoelectronics , optics , physics , nanotechnology , nanoparticle , superconductivity , quantum mechanics , metallurgy
Plasmon resonances on 2D nanosquare arrays and their temperature‐dependent modulations are demonstrated using the insulator‐to‐metal transition (IMT) of VO 2 . A comparison between observed experimental trends and electromagnetic simulations reveals that the plasmon coupling is effective in the periodic 2D alignment of metallic VO 2 nanosquares and results in a collective plasmon excitation. This plasmon excitation affects the optical responses of VO 2 nanosquares in the mid‐infrared (IR) range through reduction of plasmon damping in relation to the specific band structure of VO 2 . This preliminary understanding is important for the elucidation of temperature‐dependent plasmon resonances. The IMT of VO 2 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 VO 2 nanosquares via the IMT nature of VO 2 , which results in temperature‐dependent changes in collective plasmon excitations in the nanosquare array.