2D Freeform Plasmonic Trapping Via Spatial Light Modulator

Abstract

In this study, an objective-based two-dimensional (2D) surface plasmon (SP)-enhanced optical trapping system with a spatial light modulator (SLM) has been developed to trap dielectric particles in freeform pattern. Through a gold film with a thickness of 45 nm in the near infrared region, a 40-fold electric field enhancement is reached and hence a strong 2D trapping force distribution with SP excitation has been demonstrated. Furthermore, the algorithm called weighted Gerchberg-Saxton can provide a freeform pattern which is used to control the trapping force distributions in the image space based on SLM. Unlike the patterns formed by finite gold areas fabricated on a glass surface, the freeform plasmonic trapping is a more convenient and efficient method to manipulate nanoparticles and biomolecules arbitrarily. © 2011 Copyright Society of Photo-Optical Instrumentation Engineers (SPIE).

Meeting Name

Imaging, Manipulation, and Analysis of Biomolecules, Cells, and Tissues IX

Department(s)

Mechanical and Aerospace Engineering

Sponsor(s)

The Society of Photo-Optical Instrumentation Engineers (SPIE)

Keywords and Phrases

Optical Trapping; Spatial Light Modulator; Surface Plasmon; Total Internal Reflection

Document Type

Article - Conference proceedings

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 2011 SPIE, All rights reserved.

Publication Date

01 Jan 2011

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