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Plasmonic Surface Lattice Resonances in Suspended Symmetric Double-Layer Gratings

Authors :
Mengjia Cen
Jiawei Wang
Jianxun Liu
Ye Li
Wenfeng Cai
Delai Kong
Dan Luo
Tun Cao
Yan Jun Liu
Source :
Photonics, Vol 9, Iss 12, p 890 (2022)
Publication Year :
2022
Publisher :
MDPI AG, 2022.

Abstract

Surface lattice resonances (SLRs) with high-quality factors supported by metal nanoparticle arrays are useful for plasmonic nanolasers, biochemical sensors, and surface-enhanced Raman spectroscopy. Most nanoparticle arrays are fabricated on a substrate, and the refractive index mismatch between the substrate and superstrate suppresses the performance of SLRs. In this work, we propose unique SLRs excited in suspended, self-aligned symmetric double-layer gratings with index-matched environment. The self-aligned double-layer gratings are fabricated using a single-step electron beam lithography and exhibit a Fano-like spectra resulting from interference between out-of-plane plasmonic resonances and diffraction modes. By changing the incident angle and refractive index of the surrounding medium, the SLRs can be tuned from visible to near-infrared regions with a high-quality factor of 120.

Details

Language :
English
ISSN :
23046732
Volume :
9
Issue :
12
Database :
Directory of Open Access Journals
Journal :
Photonics
Publication Type :
Academic Journal
Accession number :
edsdoj.4805d3cbb2446ffaac4288cc17a258a
Document Type :
article
Full Text :
https://doi.org/10.3390/photonics9120890