In:
Journal of Vacuum Science & Technology B, Nanotechnology and Microelectronics: Materials, Processing, Measurement, and Phenomena, American Vacuum Society, Vol. 30, No. 6 ( 2012-11-01)
Abstract:
In this paper, the authors report on the fabrication, theory simulation, and optical characterization of X-shaped nanoscale plasmonic crystals (PCs) and their application in biosensors. X-shaped PCs with 30 nm feature line-widths and different intersection angles were fabricated by a combination of electron beam lithography and argon ion beam milling techniques. Both experimental measurement and finite-difference time-domain simulations were employed to study the transmission properties of PCs under two different incident light polarizations. With the reduction of the symmetry of the X-shaped PCs, the transmission spectra of PCs show a new peak at ∼900 nm in the near-infrared region, and the optical experimental results were consistent with the simulated results. Plasmonic crystal-based biosensors were then prepared by self-assembly of octadecanethiol to the PCs followed by biotinylation and immobilization of streptavidin to the biosensor. The sensing properties of the PC-based biosensors with a 30° intersection angle, which is enhanced by a localized surface plasmon resonance with the asymmetry of the PC, are superior to those with a larger intersection angle in biosensor application. The robust fabrication technique and the strategy for enhancing the sensitivity of the biosensor endow X-shaped PCs with a great competitive advantage over other candidates.
Type of Medium:
Online Resource
ISSN:
2166-2746
,
2166-2754
Language:
English
Publisher:
American Vacuum Society
Publication Date:
2012
detail.hit.zdb_id:
3117331-7
detail.hit.zdb_id:
1475429-0
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