Surface plasmon resonance tunability in VO₂/Au/VO₂ thermochromic structure

Abstract

Abstract Nanometal–VO 2 composite systems can exhibit a reversibly tunable localized surface plasmon effect under external temperature stimuli due to the temperature‐sensitive dielectric function of the thermochromic VO 2 thin film. In order to improve the tunability range and enhance the resonance shift magnitude (Δλ SPR ), the VO 2 /Au/VO 2 sandwich structure was deliberately designed here. The plasmonic and thermochromic characteristics of this structure were powerfully dependent on the gold deposition time ( t ). By varying this parameter, the resonance wavelength (λ SPR ) of the semiconductor phase can be regulated from the visible range (686 nm) to the near‐infrared range (1482 nm) and a maximum Δλ SPR of 714 nm can be achieved at t = 3.5 min. This study may provide insights into plasmonic noble metal nanoparticles on a thermochromic VO 2 matrix and offer potential applications in temperature‐sensitive nanodevices.