Reconfigurable infrared hyperbolic metasurfaces using phase-change materials (Conference Presentation)

Thomas Folland; Alireza Fali; Samuel T. White; Joseph R. Matson; Neda A. Aghamiri; Song Liu; James H. Edgar; Richard F. Haglund Jr.; Yohannes Abate; Joshua D. Caldwell

doi:10.1117/12.2508068

8 March 2019 Reconfigurable infrared hyperbolic metasurfaces using phase-change materials (Conference Presentation)

Thomas Folland, Alireza Fali, Samuel T. White, Joseph R. Matson, Neda A. Aghamiri, Song Liu, James H. Edgar, Richard F. Haglund Jr., Yohannes Abate, Joshua D. Caldwell

Author Affiliations +

Proceedings Volume 10927, Photonic and Phononic Properties of Engineered Nanostructures IX; 109271F (2019) https://doi.org/10.1117/12.2508068
Event: SPIE OPTO, 2019, San Francisco, California, United States

Abstract

Metasurfaces control light propagation at the nanoscale for applications in both free-space and surface-confined geometries. However, all recent designs have exhibited concepts using geometrically fixed structures, or used materials with excessive propagation losses, thereby limiting potential applications. Here we show how to overcome these limitations using a reconfigurable hyperbolic metasurface comprising a heterostructure of isotopically enriched hexagonal boron nitride (hBN) in direct contact with a phase-change material (PCM), single crystal vanadium dioxide (VO2). Metallic and dielectric domains in VO2 provide spatially localized changes in the local dielectric environment to tune the wavelength of hyperbolic phonon polaritons (HPhPs) supported in hBN by a factor of 1.6. This contrasts with earlier work using surface phonon polaritons, where propagation could only be observed above a low-loss dielectric phase. We demonstrate the first realization of in-plane HPhP refraction, which obeys Snell’s law and the means for launching, reflecting and transmitting HPhPs at the PCM domain boundaries. To demonstrate practical applications of this platform, we show how hBN could be combined with either VO2 or GeSbTe glasses to make refractive nanophotonic waveguides and lenses. This approach offers control of in-plane HPhP propagation at the nanoscale and exemplifies a reconfigurable framework combining hyperbolic media and PCMs to design new optical functionalities including resonant cavities, beam steering and waveguiding.

Conference Presentation

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Thomas Folland, Alireza Fali, Samuel T. White, Joseph R. Matson, Neda A. Aghamiri, Song Liu, James H. Edgar, Richard F. Haglund Jr., Yohannes Abate, and Joshua D. Caldwell "Reconfigurable infrared hyperbolic metasurfaces using phase-change materials (Conference Presentation)", Proc. SPIE 10927, Photonic and Phononic Properties of Engineered Nanostructures IX, 109271F (8 March 2019); https://doi.org/10.1117/12.2508068

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KEYWORDS

Infrared radiation

Dielectrics

Infrared materials

Phonons

Polaritons

Wave propagation

Boron

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