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Proceedings Paper

Optical trapping and Raman spectroscopy of single nanostructures using standing-wave Raman tweezers
Author(s): Mu-ying Wu; Lin He; Gui-hua Chen; Guang Yang; Yong-qing Li
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Paper Abstract

Optical tweezers integrated with Raman spectroscopy allows analyzing a single trapped micro-particle, but is generally less effective for individual nano-sized objects in the 10-100 nm range. The main challenge is the weak gradient force on nanoparticles that is insufficient to overcome the destabilizing effect of scattering force and Brownian motion. Here, we present standing-wave Raman tweezers for stable trapping and sensitive characterization of single isolated nanostructures with a low laser power by combining a standing-wave optical trap (SWOT) with confocal Raman spectroscopy. This scheme has stronger intensity gradients and balanced scattering forces, and thus is more stable and sensitive in measuring nanoparticles in liquid with 4-8 fold increase in the Raman signals. It can be used to analyze many nanoparticles that cannot be measured with single-beam Raman tweezers, including individual single-walled carbon nanotubes (SWCNT), graphene flakes, biological particles, polystyrene beads (100 nm), SERS-active metal nanoparticles, and high-refractive semiconductor nanoparticles with a low laser power of a few milliwatts. This would enable sorting and characterization of specific SWCNTs and other nanoparticles based on their increased Raman fingerprints.

Paper Details

Date Published: 25 August 2017
PDF: 8 pages
Proc. SPIE 10347, Optical Trapping and Optical Micromanipulation XIV, 103470G (25 August 2017); doi: 10.1117/12.2276973
Show Author Affiliations
Mu-ying Wu, Dongguan Univ. of Technology (China)
Lin He, Dongguan Univ. of Technology (China)
Gui-hua Chen, Dongguan Univ. of Technology (China)
Guang Yang, Dongguan Univ. of Technology (China)
Yong-qing Li, Dongguan Univ. of Technology (China)
East Carolina Univ. (United States)


Published in SPIE Proceedings Vol. 10347:
Optical Trapping and Optical Micromanipulation XIV
Kishan Dholakia; Gabriel C. Spalding, Editor(s)

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