Ultra-high-Q resonances in plasmonic metasurfaces

M. Saad Bin-Alam, Orad Reshef (), Yaryna Mamchur, M. Zahirul Alam, Graham Carlow, Jeremy Upham, Brian T. Sullivan, Jean-Michel Ménard, Mikko J. Huttunen, Robert W. Boyd and Ksenia Dolgaleva
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M. Saad Bin-Alam: University of Ottawa
Orad Reshef: University of Ottawa
Yaryna Mamchur: University of Ottawa
M. Zahirul Alam: University of Ottawa
Graham Carlow: Iridian Spectral Technologies Inc.
Jeremy Upham: University of Ottawa
Brian T. Sullivan: Iridian Spectral Technologies Inc.
Jean-Michel Ménard: University of Ottawa
Mikko J. Huttunen: Tampere University
Robert W. Boyd: University of Ottawa
Ksenia Dolgaleva: University of Ottawa

Nature Communications, 2021, vol. 12, issue 1, 1-8

Abstract: Abstract Plasmonic nanostructures hold promise for the realization of ultra-thin sub-wavelength devices, reducing power operating thresholds and enabling nonlinear optical functionality in metasurfaces. However, this promise is substantially undercut by absorption introduced by resistive losses, causing the metasurface community to turn away from plasmonics in favour of alternative material platforms (e.g., dielectrics) that provide weaker field enhancement, but more tolerable losses. Here, we report a plasmonic metasurface with a quality-factor (Q-factor) of 2340 in the telecommunication C band by exploiting surface lattice resonances (SLRs), exceeding the record by an order of magnitude. Additionally, we show that SLRs retain many of the same benefits as localized plasmonic resonances, such as field enhancement and strong confinement of light along the metal surface. Our results demonstrate that SLRs provide an exciting and unexplored method to tailor incident light fields, and could pave the way to flexible wavelength-scale devices for any optical resonating application.

Date: 2021
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DOI: 10.1038/s41467-021-21196-2

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