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Proceedings Paper

Study of absorption and emission dipoles of upconverting nanoparticles optically trapped at the absorption resonance
Author(s): Amrendra Kumar; Gunaseelan M.; Bhavesh Kharbanda; Rahul Vaippully; Basudev Roy
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Paper Abstract

Rare-earth doped upconverting nanoparticles like NaYF4:Yb,Er absorb infra-red light and emit visible radiation. We use light at the absorption resonance, namely 975 nm, to optically trap the nanoparticles and subsequently study the effect on the trapping parameters like the trap stiffness. We trap hexagonal shaped upconverting nanoparticles and find that these align with their side along the tweezers beam. We also place a polarizers to study the backscatter emission features and find that the emission spectra vary depending upon the orientation of the polarizer with respect to the side axis of the particle. We use this to find the rotational Brownian motion along the yaw sense. We also use the fluorescent emission to ascertain the axial Brownian motion of the particle. This can be used to ascertain the motion of the particle while trapped on resonance in tweezers without actually accessing the infra-red trapping light.

Paper Details

Date Published: 1 April 2020
PDF: 7 pages
Proc. SPIE 11345, Nanophotonics VIII, 113450Y (1 April 2020); doi: 10.1117/12.2547476
Show Author Affiliations
Amrendra Kumar, Indian Institute of Technology Madras (India)
Gunaseelan M., Indian Institute of Technology Madras (India)
Bhavesh Kharbanda, Indian Institute of Technology Madras (India)
Rahul Vaippully, Indian Institute of Technology Madras (India)
Basudev Roy, Indian Institute of Technology Madras (India)

Published in SPIE Proceedings Vol. 11345:
Nanophotonics VIII
David L. Andrews; Angus J. Bain; Martti Kauranen; Jean-Michel Nunzi, Editor(s)

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