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Proceedings Paper

Plasmonic nanopillar arrays for optical trapping, biosensing, and spectroscopy
Author(s): Arif E. Cetin; Ahmet Ali Yanik; Cihan Yilmaz; Sivasubramanian Somu; Ahmed Busnaina; Hatice Altug
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Paper Abstract

In this work, we propose a unique plasmonic substrate that combine the strength of localized and extended surface plasmons for optical trapping, spectroscopy and biosensing, all in the same platform. The system is based on periodic arrays of gold nanopillars fabricated on a thin gold sheet. The proposed periodic structure exhibits high refractive index sensitivities, as large as 675 nm/RIU which is highly desirable for biosensing applications. The spectrally sharp resonances, we determine a figure of merit, as large as 112.5. The nanopillar array also supports easily accessible high near-field enhancements, as large as 10.000 times, for surface enhanced spectroscopy. The plasmonic hot spots with high intensity enhancement lead to large gradient forces, 350 pN/W/μm2, needed for optical trapping applications.

Paper Details

Date Published: 9 September 2011
PDF: 7 pages
Proc. SPIE 8097, Optical Trapping and Optical Micromanipulation VIII, 80971P (9 September 2011); doi: 10.1117/12.891921
Show Author Affiliations
Arif E. Cetin, Boston Univ. (United States)
Ahmet Ali Yanik, Boston Univ. (United States)
Cihan Yilmaz, Northeastern Univ. (United States)
Sivasubramanian Somu, Northeastern Univ. (United States)
Ahmed Busnaina, Northeastern Univ. (United States)
Hatice Altug, Boston Univ. (United States)

Published in SPIE Proceedings Vol. 8097:
Optical Trapping and Optical Micromanipulation VIII
Kishan Dholakia; Gabriel C. Spalding, Editor(s)

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