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Plasmonic Trapping and Release of Nanoparticles in a Monitoring Environment

Plasmonic Trapping and Release of Nanoparticles in a Monitoring Environment

Published on: April 4, 2017

Scannable plasmonic trapping using a gold stripe.

Kai Wang¹, Ethan Schonbrun, Paul Steinvurzel

¹School of Engineering and Applied Sciences, Harvard University, Cambridge, Massachusetts 02138, USA. kcrozier@seas.harvard.edu

|August 19, 2010

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Researchers developed a scannable integrated optical tweezer using surface plasmon polaritons (SPPs) on a gold stripe. This device traps and precisely controls fluorescent beads, advancing plasmonic optical manipulation capabilities.

Area of Science:

Plasmonics
Nanophotonics
Optical Tweezers

Background:

Surface plasmon polaritons (SPPs) offer unique light-matter interaction properties at the nanoscale.
Integrated optical tweezers are crucial for precise manipulation of microscopic particles.
Existing plasmonic tweezers lack scanning capabilities for dynamic manipulation.

Purpose of the Study:

To demonstrate a novel scannable integrated optical tweezer.
To achieve precise trapping and manipulation of individual fluorescent beads using SPPs.
To introduce scanning functionality to plasmonic optical tweezers.

Main Methods:

Utilizing counterpropagating surface plasmon polaritons (SPPs) on a gold stripe.
Exciting SPPs via prism coupling to create a trapping potential.

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Balancing scattering forces from SPPs for longitudinal localization.

Controlling particle position by adjusting the relative intensity of input beams.

Main Results:

Successful trapping of individual fluorescent beads on the gold stripe.
High transverse localization precision (51 nm standard deviation).
Achieved trap stiffness of 1.7 pN/microm.
Demonstrated controlled positioning of trapped particles along the stripe.

Conclusions:

The developed device integrates scanning capability into plasmonic optical tweezers.
This advancement enhances the versatility and applicability of plasmonic manipulation.
The scannable tweezer opens new avenues for advanced nanoscale research and applications.