Refractive Index-Based Control of Hyperbolic Phonon-Polariton PropagationClick to copy article linkArticle link copied!
- Alireza FaliAlireza FaliDepartment of Physics and Astronomy, University of Georgia, Athens, Georgia 30602, United StatesMore by Alireza Fali
- Samuel T. WhiteSamuel T. WhiteDepartment of Physics and Astronomy, Vanderbilt University, Nashville, Tennessee 37235, United StatesMore by Samuel T. White
- Thomas G. FollandThomas G. FollandDepartment of Mechanical Engineering, Vanderbilt University, Nashville, Tennessee 37212, United StatesMore by Thomas G. Folland
- Mingze HeMingze HeDepartment of Mechanical Engineering, Vanderbilt University, Nashville, Tennessee 37212, United StatesMore by Mingze He
- Neda A. AghamiriNeda A. AghamiriDepartment of Physics and Astronomy, University of Georgia, Athens, Georgia 30602, United StatesMore by Neda A. Aghamiri
- Song LiuSong LiuTim Taylor Department of Chemical Engineering, Kansas State University, Manhattan, Kansas 66506 United StatesMore by Song Liu
- James H. EdgarJames H. EdgarTim Taylor Department of Chemical Engineering, Kansas State University, Manhattan, Kansas 66506 United StatesMore by James H. Edgar
- Joshua D. CaldwellJoshua D. CaldwellDepartment of Mechanical Engineering, Vanderbilt University, Nashville, Tennessee 37212, United StatesInterdisciplinary Materials Science Program, Vanderbilt University, Nashville, Tennessee 37212, United StatesMore by Joshua D. Caldwell
- Richard F. HaglundRichard F. HaglundDepartment of Physics and Astronomy, Vanderbilt University, Nashville, Tennessee 37235, United StatesInterdisciplinary Materials Science Program, Vanderbilt University, Nashville, Tennessee 37212, United StatesMore by Richard F. Haglund
- Yohannes Abate*Yohannes Abate*E-mail: [email protected]Department of Physics and Astronomy, University of Georgia, Athens, Georgia 30602, United StatesMore by Yohannes Abate
Abstract

Hyperbolic phonon polaritons (HPhPs) are generated when infrared photons couple to polar optic phonons in anisotropic media, confining long-wavelength light to nanoscale volumes. However, to realize the full potential of HPhPs for infrared optics, it is crucial to understand propagation and loss mechanisms on substrates suitable for applications from waveguiding to infrared sensing. We employ scattering-type scanning near-field optical microscopy (s-SNOM) and nano-Fourier transform infrared (FTIR) spectroscopy, in concert with analytical and numerical calculations, to elucidate HPhP characteristics as a function of the complex substrate dielectric function. We consider propagation on suspended, dielectric and metallic substrates to demonstrate that the thickness-normalized wavevector can be reduced by a factor of 25 simply by changing the substrate from dielectric to metallic behavior. Moreover, by incorporating the imaginary contribution to the dielectric function in lossy materials, the wavevector can be dynamically controlled by small local variations in loss or carrier density. Counterintuitively, higher-order HPhP modes are shown to exhibit the same change in the polariton wavevector as the fundamental mode, despite the drastic differences in the evanescent ranges of these polaritons. However, because polariton refraction is dictated by the fractional change in the wavevector, this still results in significant differences in polariton refraction and reduced sensitivity to substrate-induced losses for the higher-order HPhPs. Such effects may therefore be used to spatially separate hyperbolic modes of different orders and for index-based sensing schemes. Our results advance our understanding of fundamental hyperbolic polariton excitations and their potential for on-chip photonics and planar metasurface optics.
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