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Title: Reconfigurable optical manipulation by phase change material waveguides
Authors: Zhang, T 
Mei, S
Wang, Q
Liu, H
Lim, C.T 
Teng, J
Keywords: Dielectric waveguides
Materials handling
Phase change materials
Crystalline phase
Diffraction limits
Lab-on-chip systems
Laser induced phase transitions
Manipulation system
Multiple objects
Optical manipulation
Trapped particle
Issue Date: 2017
Publisher: Royal Society of Chemistry
Citation: Zhang, T, Mei, S, Wang, Q, Liu, H, Lim, C.T, Teng, J (2017). Reconfigurable optical manipulation by phase change material waveguides. Nanoscale 9 (20) : 6895-6900. ScholarBank@NUS Repository.
Abstract: Optical manipulation by dielectric waveguides enables the transportation of particles and biomolecules beyond diffraction limits. However, traditional dielectric waveguides could only transport objects in the forward direction which does not fulfill the requirements of the next generation lab-on-chip system where the integrated manipulation system should be much more flexible and multifunctional. In this work, bidirectional transportation of objects on the nanoscale is demonstrated on a rectangular waveguide made of the phase change material Ge 2 Sb 2 Te 5 (GST) by numerical simulations. Either continuous pushing forces or pulling forces are generated on the trapped particles when the GST is in the amorphous or crystalline phase. With the technique of a femtosecond laser induced phase transition on the GST, we further proposed a reconfigurable optical trap array on the same waveguide. This work demonstrates GST waveguide's potential of achieving multifunctional manipulation of multiple objects on the nanoscale with plausible optical setups. © 2017 The Royal Society of Chemistry.
Source Title: Nanoscale
ISSN: 20403364
DOI: 10.1039/c7nr00876g
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