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

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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 x 10(-5) lambda(3)(0). 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.
Publisher
NATURE PUBLISHING GROUP
Issue Date
2016-02
Language
English
Article Type
Article
Keywords

SLOT WAVE-GUIDES; SPONTANEOUS EMISSION; REFRACTIVE-INDEX; 10 NM; LAYERS; MODES; NANOSTRUCTURES; ENHANCEMENT; SENSITIVITY; ANTENNAS

Citation

SCIENTIFIC REPORTS, v.6

ISSN
2045-2322
DOI
10.1038/srep22305
URI
http://hdl.handle.net/10203/207950
Appears in Collection
NT-Journal Papers(저널논문)
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