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99 results on '"Truong, Viet Giang"'

58. Fast and efficient nanoparticle trapping using plasmonic connected nanoring apertures.

Author

Bouloumis, Theodoros D, Kotsifaki, Domna G, Han, Xue, Chormaic, Síle Nic, and Truong, Viet Giang

Subjects
TRAPPING, NANOPARTICLES, PHYSICAL sciences, LIFE sciences
Abstract

The manipulation of microparticles using optical forces has led to many applications in the life and physical sciences. To extend optical trapping towards the nano-regime, in this work we demonstrate trapping of single nanoparticles in arrays of plasmonic coaxial nano-apertures with various inner disk sizes and theoretically estimate the associated forces. A high normalized experimental trap stiffness of 3.50 fN nm−1 mW−1μm−2 for 20 nm polystyrene particles is observed for an optimum design of 149 nm for the nanodisk diameter at a trapping wavelength of 980 nm. Theoretical simulations are used to interpret the enhancement of the observed trap stiffness. A quick particle trapping time of less than 8 s is obtained at a concentration of 14 × 1011 particles ml−1 with low incident laser intensity of 0.59 mW μm−2. This good trapping performance with fast delivery of nanoparticles to multiple trapping sites emerges from a combination of the enhanced electromagnetic near-field and spatial temperature increase. This work has applications in nanoparticle delivery and trapping with high accuracy, and bridges the gap between optical manipulation and nanofluidics. [ABSTRACT FROM AUTHOR]

Published
2021
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99. Spectroscopy, manipulation and trapping of neutral atoms, molecules, and other particles using optical nanofibers: a review.

Author

Morrissey MJ, Deasy K, Frawley M, Kumar R, Prel E, Russell L, Truong VG, and Chormaic SN

Subjects
Equipment Design, Equipment Failure Analysis, Fiber Optic Technology instrumentation, Micromanipulation instrumentation, Molecular Imaging instrumentation, Nanofibers chemistry, Nanofibers ultrastructure, Optical Devices, Optical Tweezers
Abstract

The use of tapered optical fibers, i.e., optical nanofibers, for spectroscopy and the detection of small numbers of particles, such as neutral atoms or molecules, has been gaining interest in recent years. In this review, we briefly introduce the optical nanofiber, its fabrication, and optical mode propagation within. We discuss recent progress on the integration of optical nanofibers into laser-cooled atom and vapor systems, paying particular attention to spectroscopy, cold atom cloud characterization, and optical trapping schemes. Next, a natural extension of this work to molecules is introduced. Finally, we consider several alternatives to optical nanofibers that display some advantages for specific applications.

Published
2013
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