Plasmonic nanopillar arrays for optical trapping, biosensing, and spectroscopy

Arif E. Cetin; Ahmet Ali Yanik; Cihan Yilmaz; Sivasubramanian Somu; Ahmed Busnaina; Hatice Altug

doi:10.1117/12.891921

9 September 2011 Plasmonic nanopillar arrays for optical trapping, biosensing, and spectroscopy

Arif E. Cetin, Ahmet Ali Yanik, Cihan Yilmaz, Sivasubramanian Somu, Ahmed Busnaina, Hatice Altug

Proceedings Volume 8097, Optical Trapping and Optical Micromanipulation VIII; 80971P (2011) https://doi.org/10.1117/12.891921
Event: SPIE NanoScience + Engineering, 2011, San Diego, California, United States

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.

Citation Download Citation

Arif E. Cetin, Ahmet Ali Yanik, Cihan Yilmaz, Sivasubramanian Somu, Ahmed Busnaina, and Hatice Altug "Plasmonic nanopillar arrays for optical trapping, biosensing, and spectroscopy", Proc. SPIE 8097, Optical Trapping and Optical Micromanipulation VIII, 80971P (9 September 2011); https://doi.org/10.1117/12.891921

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