Phase‐Change Hyperbolic Heterostructures for Nanopolaritonics: A Case Study of hBN/VO₂
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1809.09652.pdf
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Author(s)
Dai, Siyuan
Zhang, Jiawei
Ma, Qiong
Kittiwatanakul, Salinporn
McLeod, Alex
Chen, Xinzhong
Corder, Stephanie Gilbert
Watanabe, Kenji
Taniguchi, Takashi
Lu, Jiwei
Date Issued
May 2019
Journal
Advanced Materials
Publisher
Wiley Blackwell
Citation
Dai, Siyuan et al. "Phase‐Change Hyperbolic Heterostructures for Nanopolaritonics: A Case Study of hBN/VO₂" Advanced Materials 31 (May 2019): 1900251 © Wiley Blackwell
Version
Original manuscript
Abstract
Unlike conventional plasmonic media, polaritonic van der Waals (vdW) materials hold promise for active control of light-matter interactions. The dispersion relations of elementary excitations such as phonons and plasmons can be tuned in layered vdW systems via stacking using functional substrates. In this work, infrared nanoimaging and nanospectroscopy of hyperbolic phonon polaritons are demonstrated in a novel vdW heterostructure combining hexagonal boron nitride (hBN) and vanadium dioxide (VO₂). It is observed that the insulator-to-metal transition in VO₂ has a profound impact on the polaritons in the proximal hBN layer. In effect, the real-space propagation of hyperbolic polaritons and their spectroscopic resonances can be actively controlled by temperature. This tunability originates from the effective change in local dielectric properties of the VO₂ sublayer in the course of the temperature-tuned insulator-to-metal phase transition. The high susceptibility of polaritons to electronic phase transitions opens new possibilities for applications of vdW materials in combination with strongly correlated quantum materials. Keywords: hexagonal boron nitride; phase-change materials; polaritons
MIT Department
Massachusetts Institute of Technology. Department of Physics
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DOI of Published Version
https://doi.org/10.1002/adma.201900251
