High-Q quadrupolar plasmonic lattice resonances in horizontal metal-insulator-metal gratings.
Opt Lett
; 46(7): 1546-1549, 2021 Apr 01.
Article
en En
| MEDLINE
| ID: mdl-33793482
ABSTRACT
We propose a plasmonic platform for achieving out-of-plane quadrupolar plasmonic surface lattice resonances (SLRs) with large quality factors. The proposed platform is composed of a horizontal metal-insulator-metal (MIM) grating embedded in a homogeneous dielectric environment. Numerical results based on rigorous coupled-wave analysis show that under oblique incidences, high-Q out-of-plane quadrupolar SLRs can be excited at wavelengths of 1242 nm over a wide range of insulator widths, and the quality factor can reach 1036. As a comparison, under the same conditions, only dipolar SLRs with much lower quality factors of â¼300 can be excited in a vertical MIM grating, which has the same period and a quarter-turned unit cell. We expect that the proposed high-Q quadrupolar SLR platform will find applications in light-matter interactions on the nanoscale.
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01-internacional
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MEDLINE
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En
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Opt Lett
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2021
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Article