Journal
JOURNAL OF OPTICS
Volume 18, Issue 6, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/2040-8978/18/6/065104
Keywords
metamaterial perfect optical absorber; SERS; hybrid plasmonic resonance; plasmonic structure; laser interference lithography; Raman scattering; sensor; detector; plasmonic absorber
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Funding
- Department of Science and Technology, India [DST/SJF/PSA-01/2011-2012]
- IIT Kanpur
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A tri-layer metamaterial perfect absorber of light, consisting of (Al/ZnS/Al) films with the top aluminum layer patterned as an array of circular disk nanoantennas, is investigated for resonantly enhancing Raman scattering from C60 fullerene molecules deposited on the metamaterial. The metamaterial is designed to have resonant bands due to plasmonic and electromagnetic resonances at the Raman pump frequency (725 nm) as well as Stokes emission bands. The Raman scattering from C60 on the metamaterial with resonantly matched bands is measured to be enhanced by an order of magnitude more than C60 on metamaterials with off-resonant absorption bands peaking at 1090 nm. The Raman pump is significantly enhanced due to the resonance with a propagating surface plasmon band, while the highly impedance-matched electromagnetic resonance is expected to couple out the Raman emission efficiently. The nature and hybridization of the plasmonic and electromagnetic resonances to form compound resonances are investigated by numerical simulations.
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