Actively tunable plasmonic nanogap cavities in the near-infrared using VO2

Andrew M. Boyce; Jon W. Stewart; Jason Avila; Qixin Shen; Virginia D. Wheeler; Maiken H. Mikkelsen

doi:10.1117/12.2567177

20 August 2020 Actively tunable plasmonic nanogap cavities in the near-infrared using VO2

Andrew M. Boyce, Jon W. Stewart, Jason Avila, Qixin Shen, Virginia D. Wheeler, Maiken H. Mikkelsen

Proceedings Volume 11461, Active Photonic Platforms XII; 114610O (2020) https://doi.org/10.1117/12.2567177
Event: SPIE Nanoscience + Engineering, 2020, Online Only

Abstract

Actively tunable optical materials integrated with engineered subwavelength structures could enable a new generation of optoelectronic devices with low power consumption for on-chip hyperspectral focal plane arrays or optical beam steering. Phase-change materials, such as vanadium dioxide (VO2), are a promising solid-state solution for dynamic tuning; however, previous demonstrations have focused on VO2 films with >50 nm thickness, limiting their use in e.g. optical memory devices. Here we integrate nanometer-thick VO2 films with plasmonic metasurfaces to demonstrate tunable near-perfect absorption in the near-IR ranging from 900 nm to >1500 nm. Upon heating to induce the phase transition, the absorption resonance can be blue-shifted by up to 40 nm, a process that can be completely reversed by cooling and repeated over multiple cycles. Finite-element simulations follow the experimental spectral dependence and demonstrate that ~160 nm of tuning may be possible with further optimization.

Conference Presentation

Citation Download Citation

Andrew M. Boyce, Jon W. Stewart, Jason Avila, Qixin Shen, Virginia D. Wheeler, and Maiken H. Mikkelsen "Actively tunable plasmonic nanogap cavities in the near-infrared using VO2", Proc. SPIE 11461, Active Photonic Platforms XII, 114610O (20 August 2020); https://doi.org/10.1117/12.2567177

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