Please use this identifier to cite or link to this item: https://doi.org/10.1364/AO.50.000G74
Title: Tuning of localized surface plasmon resonance of well-ordered Ag/Au bimetallic nanodot arrays by laser interference lithography and thermal annealing
Authors: Xu, L.
Tan, L.S.
Hong, M.H. 
Issue Date: 1-Nov-2011
Source: Xu, L., Tan, L.S., Hong, M.H. (2011-11-01). Tuning of localized surface plasmon resonance of well-ordered Ag/Au bimetallic nanodot arrays by laser interference lithography and thermal annealing. Applied Optics 50 (31) : G74-G79. ScholarBank@NUS Repository. https://doi.org/10.1364/AO.50.000G74
Abstract: A novel hybrid approach to fabricate large-area well-ordered Ag/Au bimetallic nanodot arrays and its potential applications for biosensing is investigated. With the combination of laser interference lithography and the thermal annealing technique, Ag/Au bimetallic nanodots about ∼50 nm are formed inside periodic nanodisk arrays at a dimension of ∼530 nm on quartz substrates. Extinction spectra of the fabricated nanostructures show their localized surface plasmon resonance (LSPR) can be well controlled by Au concentration, which offers a means to flexibly tune the optical properties of the nanodot arrays. To study the sensitivity of the nanodot arrays, resonance wavelength changes per refractive index unit (RIU) are performed in different surrounding environments. This shows a 94% increase in peak shift per refractive index unit (nanometers/RIU) compared to the nanodot arrays formed only by thermal annealing. These results demonstrate a feasible approach to improve LSPR-based biosensor performance. © 2011 Optical Society of America.
Source Title: Applied Optics
URI: http://scholarbank.nus.edu.sg/handle/10635/57720
ISSN: 00036935
DOI: 10.1364/AO.50.000G74
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