Mr. Pranam Prakash Profile

Pranam Prakash

at CUSAT

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Proceedings Article | 25 August 2015 Presentation + Paper

Characterization of periodic plasmonic nanoring devices for nanomanipulation

M. Sergides, V. Truong, P. Prakash, J. Schloss, B. Bhardwaj, S. Nic Chormaic

Proceedings Volume 9548, 95481T (2015) https://doi.org/10.1117/12.2186700

KEYWORDS: Plasmonics, Particles, Gold, Electron beam lithography, Plasmons, Nanoparticles, Near infrared, Optical tweezers, Glasses, Nanomanipulation

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We study the optical properties of hybrid gold nanodisk and nanohole arrays and present experimental evidence of nanoparticle trapping using these devices. The fabrication procedure using electron beam lithography (EBL) is also discussed. This hybrid design exhibits a splitting of the resonance modes (low and high energy modes) due to the coupling of the electromagnetic interaction between nanohole and nanodisk plasmons. The devices demonstrate high plasmon resonance tunabilities from the visible to the near-infrared region (NIR) by varying the dimensions of the features of this design. This enhancement in the NIR is highly desirable for the purposes of biological sample manipulation where photo damage should be low. Additionally, these devices consist of grooves connecting the hybrid structures to each other. These regions provide further enhancement of the local electric fields and play the role of the trapping sites. We demonstrate multiple dielectric nanoparticle trapping in these grooves while the devices are excited by evanescent fields via the Kretschmann configuration. The results provide good evidence of the potential of this design to be used for the manipulation of biological samples with sub-diffraction limit sizes.

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