Ultra sub-wavelength surface plasmon confinement using air-gap, sub-wavelength ring resonator arrays

Jaehak Lee, Sangkeun Sung, Jun-Hyuk Choi, Seok Chan Eom, N. Asger Mortensen, Jung H Shin

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Abstract

Arrays of sub-wavelength, sub-10 nm air-gap plasmonic ring resonators are fabricated using nanoimprinting. In near infra-red (NIR) range, the resonator supports a single dipole mode which is excited and identified via simple normal illumination and explored through transmission measurements. By controlling both lateral and vertical confinement via a metal edge, the mode volume is successfully reduced down to 1.3 × 10(-5) λ0(3). The advantage of such mode confinement is demonstrated by applying the resonators biosensing. Using bovine serum albumin (BSA) molecules, a dramatic enhancement of surface sensitivity up to 69 nm/nm is achieved as the modal height approaches the thickness of the adsorbed molecule layers.
Original languageEnglish
Article number22305
JournalScientific Reports
Volume6
Number of pages8
ISSN2045-2322
DOIs
Publication statusPublished - 2016

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