Resolving stable axial trapping points of nanowires in an optical tweezers using photoluminescence mapping

Fan Wang, Wen Jun Toe, Woei Ming Lee, David McGloin, Qiang Gao, Hark Hoe Tan, Chennupati Jagadish, Peter J. Reece*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

30 Citations (Scopus)

Abstract

Axially resolved microphotoluminescence mapping of semiconductor nanowires held in an optical tweezers reveals important new experimental information regarding equilibrium trapping points and trapping stability of high aspect ratio nanostructures. In this study, holographic optical tweezers are used to scan trapped InP nanowires along the beam direction with respect to a fixed excitation source and the luminescent properties are recorded. It is observed that nanowires with lengths on the range of 3-15 μm are stably trapped near the tip of the wire with the long segment positioned below the focus in an inverted trapping configuration. Through the use of trap multiplexing we investigate the possibility of improving the axial stability of the trapped nanowires. Our results have important implication for applications of optically assisted nanowire assembly and optical tweezers based scanning probes microscopy.

Original languageEnglish
Pages (from-to)1185-1191
Number of pages7
JournalNano Letters
Volume13
Issue number3
DOIs
Publication statusPublished - 13 Mar 2013

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