High-Q dark hyperbolic phonon-polaritons in hexagonal boron nitride nanostructures

Georg Ramer; Mohit Tuteja; Joseph R. Matson; Marcelo Davanco; Thomas G. Folland; Andrey Kretinin; Takashi Taniguchi; Kenji Watanabe; Kostya S. Novoselov; Joshua D. Caldwell; Andrea Centrone

doi:10.1515/nanoph-2020-0048

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High-Q dark hyperbolic phonon-polaritons in hexagonal boron nitride nanostructures

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High-Q dark hyperbolic phonon-polaritons in hexagonal boron nitride nanostructures

Georg Ramer, Mohit Tuteja, Joseph R. Matson, Marcelo Davanco, Thomas G. Folland, Andrey Kretinin, Takashi Taniguchi, Kenji Watanabe, Kostya S. Novoselov, Joshua D. Caldwell, …

Nanophotonics (Berlin, Germany), Vol.9(6), pp.1457-1467

01/01/2020

DOI: 10.1515/nanoph-2020-0048

PMCID: PMC7754710

PMID: 33365225

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Abstract

The anisotropy of hexagonal boron nitride (hBN) gives rise to hyperbolic phonon-polaritons (HPhPs), notable for their volumetric frequency-dependent propagation and strong confinement. For frustum (truncated nanocone) structures, theory predicts five, high-order HPhPs, sets, but only one set was observed previously with far-field reflectance and scattering-type scanning near-field optical microscopy. In contrast, the photothermal induced resonance (PTIR) technique has recently permitted sampling of the full HPhP dispersion and observing such elusive predicted modes; however, the mechanism underlying PTIR sensitivity to these weakly-scattering modes, while critical to their understanding, has not yet been clarified. Here, by comparing conventional contact- and newly developed tapping-mode PTIR, we show that the PTIR sensitivity to those weakly-scattering, high-Q (up to ≈280) modes is, contrary to a previous hypothesis, unrelated to the probe operation (contact or tapping) and is instead linked to PTIR ability to detect tip-launched dark, volumetrically-confined polaritons, rather than nanostructure-launched HPhPs modes observed by other techniques. Furthermore, we show that in contrast with plasmons and surface phonon-polaritons, whose Q -factors and optical cross-sections are typically degraded by the proximity of other nanostructures, the high- Q HPhP resonances are preserved even in high-density hBN frustum arrays, which is useful in sensing and quantum emission applications.

dark modes

hexagonal boron nitride

high-Q

hyperbolic phonon polariton

PTIR

s-SNOM

Details

Title: Subtitle: High-Q dark hyperbolic phonon-polaritons in hexagonal boron nitride nanostructures
Creators: Georg Ramer - Physical Measurement Laboratory
Mohit Tuteja - Physical Measurement Laboratory
Joseph R. Matson - Vanderbilt University
Marcelo Davanco - Physical Measurement Laboratory
Thomas G. Folland - Vanderbilt University
Andrey Kretinin - University of Manchester
Takashi Taniguchi - National Institute for Materials Science
Kenji Watanabe - National Institute for Materials Science
Kostya S. Novoselov - University of Manchester
Joshua D. Caldwell - Vanderbilt University
Andrea Centrone - Physical Measurement Laboratory
Resource Type: Journal article
Publication Details: Nanophotonics (Berlin, Germany), Vol.9(6), pp.1457-1467
DOI: 10.1515/nanoph-2020-0048
PMID: 33365225
PMCID: PMC7754710
NLM abbreviation: Nanophotonics
ISSN: 2192-8606
eISSN: 2192-8614
Grant note: DOI: 10.13039/501100003382, name: Core Research for Evolutional Science and Technology; DOI: 10.13039/100008510, name: University of Maryland; DOI: 10.13039/100000001, name: National Science Foundation; DOI: 10.13039/100000078, name: Division of Materials Research; DOI: 10.13039/100006537, name: Vanderbilt University; DOI: 10.13039/501100001700, name: Ministry of Education, Culture, Sports, Science and Technology
Language: English
Date published: 01/01/2020
Academic Unit: Physics and Astronomy
Record Identifier: 9984428802402771

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