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Numerical analysis of an optical nanoscale particles trapping device based on a slotted nanobeam cavity
KTH, School of Electrical Engineering (EES), Electromagnetic Engineering. Zhejiang University, China.ORCID iD: 0000-0002-3401-1125
2016 (English)In: Scientific Reports, ISSN 2045-2322, E-ISSN 2045-2322, Vol. 6, 35977Article in journal (Refereed) Published
Abstract [en]

A slotted nanobeam cavity (SNC) is utilized to trap a polystyrene (PS) particle with a radius of only 2 nm. The carefully designed SNC shows an ultrahigh Q factor of 4.5 x 10(7) while maintaining a small mode volume of 0.067(lambda/n(water))(3). Strongly enhanced optical trapping force is numerically demonstrated when the 2 nm PS particle is introduced into the central, slotted part of the SNC. In the vertical direction, the numerical calculation results show that a trapping stiffness of 0.4 pN/(nm.mW) around the equilibrium position and a trapping potential barrier of similar to 2000 k(B)T/mW can be reached. To our best knowledge, the trapping capability (trapping stiffness and trapping potential barrier) of the proposed structure significantly outperforms the theoretical results of those in previously reported work. In addition, the SNC system does not suffer from the metal induced heat issue that restricts the performance of state-of-the-art optical trapping systems involving plasmonic enhancement. Based on the proposed cavity, applications such as lab-on-a-chip platforms for nanoscale particle trapping and analysis can be expected in future.

Place, publisher, year, edition, pages
2016. Vol. 6, 35977
National Category
Electrical Engineering, Electronic Engineering, Information Engineering Physical Sciences Nano Technology
URN: urn:nbn:se:kth:diva-196982DOI: 10.1038/srep35977ISI: 000386767400001ScopusID: 2-s2.0-84992574391OAI: diva2:1055969

QC 20161213

Available from: 2016-12-13 Created: 2016-11-28 Last updated: 2016-12-13Bibliographically approved

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He, Sailing
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