Polar Semiconducting Scandium Nitride as an Infrared Plasmon and Phonon-Polaritonic Material

Maurya, KC and Rao, D and Acharya, S and Rao, P and Pillai, AIK and Selvaraja, SK and Garbrecht, M and Saha, B (2022) Polar Semiconducting Scandium Nitride as an Infrared Plasmon and Phonon-Polaritonic Material. In: Nano Letters, 22 (13). pp. 5182-5190.

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Abstract

The interaction of light with collective charge oscillations, called plasmon-polariton, and with polar lattice vibrations, called phonon-polariton, are essential for confining light at deep subwavelength dimensions and achieving strong resonances. Traditionally, doped-semiconductors and conducting metal oxides (CMO) are used to achieve plasmon-polaritons in the near-to-mid infrared (IR), while polar dielectrics are utilized for realizing phonon-polaritons in the long-wavelength IR (LWIR) spectral regions. However, demonstrating low-loss plasmon- and phonon-polaritons in one host material will make it attractive for practical applications. Here, we demonstrate high-quality tunable short-wavelength IR (SWIR) plasmon-polariton and LWIR phonon-polariton in complementary metal-oxide-semiconductor compatible group III-V polar semiconducting scandium nitride (ScN) thin films. We achieve both resonances by utilizing n-type (oxygen) and p-type (magnesium) doping in ScN that allows modulation of carrier concentration from 5 × 1018 to 1.6 × 1021 cm-3. Our work enables infrared nanophotonics with an epitaxial group III semiconducting nitride, opening the possibility for practical applications.

Item Type:	Journal Article
Publication:	Nano Letters
Publisher:	American Chemical Society
Additional Information:	The copyright for this article belongs to the American Chemical Society.
Keywords:	Carrier concentration; CMOS integrated circuits; Lattice vibrations; Metals; Oxide films; Oxide semiconductors; Phonons; Plasmonics; Scandium compounds; Semiconductor doping, Alternative plasmonic material; Charge oscillation; Group III; Infrared plasmonic; Phonon polaritons; Plasmon-polaritons; Plasmonics; Polaritonic materials; Reststrahlen band, Nitrides
Department/Centre:	Division of Interdisciplinary Sciences > Centre for Nano Science and Engineering
Date Deposited:	27 Jul 2022 11:48
Last Modified:	27 Jul 2022 11:48
URI:	https://eprints.iisc.ac.in/id/eprint/75013

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