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Resonant nanostructures for highly-confined and ultrasensitive surface phonon-polaritons

Resonant nanostructures for highly-confined and ultrasensitive surface phonon-polaritons
Resonant nanostructures for highly-confined and ultrasensitive surface phonon-polaritons
Plasmonics on metal-dielectric interfaces was widely seen as the main route for miniaturization of components and interconnect of photonic circuits. However recently, ultra-confined surface phonon-polaritonics in high-index chalcogenide films of nanometric thickness have emerged as an important alternative to plasmonics. Here, using mid-IR near-field imaging we demonstrate tunable surface phonon-polaritons in CMOS-compatible interfaces of few-nm thick germanium on silicon carbide. We show that Ge-SiC resonators with nanoscale footprint can support sheet and edge surface modes excited at the free space wavelength hundred times larger than their physical dimensions. Owing to the surface nature of the modes, the sensitivity of real-space polaritonic patterns provides pathway for local detection of the interface composition change at sub-nanometer level. Such deeply subwavelength resonators are of interest for high-density optoelectronic applications, filters, dispersion control and optical delay devices.
2041-1723
Dubrovkin, Alexander
fa0e6582-e26b-4881-a89e-fe091fac5753
Qiang, Bo
e92401c1-a870-40c2-91d7-ab70fa7a2ecd
Salim, Teddy
fcf0b9e8-aa73-4d18-970b-ecd60516df97
Nam, Donguk
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Zheludev, Nikolai
32fb6af7-97e4-4d11-bca6-805745e40cc6
Wang, Qi Jie
4d00dfbb-4005-47eb-99bb-9ca2fed1459e
Dubrovkin, Alexander
fa0e6582-e26b-4881-a89e-fe091fac5753
Qiang, Bo
e92401c1-a870-40c2-91d7-ab70fa7a2ecd
Salim, Teddy
fcf0b9e8-aa73-4d18-970b-ecd60516df97
Nam, Donguk
f589f6fd-b6a1-495d-99e1-66e7f7405c31
Zheludev, Nikolai
32fb6af7-97e4-4d11-bca6-805745e40cc6
Wang, Qi Jie
4d00dfbb-4005-47eb-99bb-9ca2fed1459e

Dubrovkin, Alexander, Qiang, Bo, Salim, Teddy, Nam, Donguk, Zheludev, Nikolai and Wang, Qi Jie (2020) Resonant nanostructures for highly-confined and ultrasensitive surface phonon-polaritons. Nature Communications, 11, [1863]. (doi:10.1038/s41467-020-15767-y).

Record type: Article

Abstract

Plasmonics on metal-dielectric interfaces was widely seen as the main route for miniaturization of components and interconnect of photonic circuits. However recently, ultra-confined surface phonon-polaritonics in high-index chalcogenide films of nanometric thickness have emerged as an important alternative to plasmonics. Here, using mid-IR near-field imaging we demonstrate tunable surface phonon-polaritons in CMOS-compatible interfaces of few-nm thick germanium on silicon carbide. We show that Ge-SiC resonators with nanoscale footprint can support sheet and edge surface modes excited at the free space wavelength hundred times larger than their physical dimensions. Owing to the surface nature of the modes, the sensitivity of real-space polaritonic patterns provides pathway for local detection of the interface composition change at sub-nanometer level. Such deeply subwavelength resonators are of interest for high-density optoelectronic applications, filters, dispersion control and optical delay devices.

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Accepted/In Press date: 27 March 2020
e-pub ahead of print date: 20 April 2020

Identifiers

Local EPrints ID: 439378
URI: http://eprints.soton.ac.uk/id/eprint/439378
ISSN: 2041-1723
PURE UUID: fda5ed94-e7ec-4ddf-a693-77893b772458
ORCID for Nikolai Zheludev: ORCID iD orcid.org/0000-0002-1013-6636

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Date deposited: 20 Apr 2020 16:36
Last modified: 20 May 2020 00:28

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