Extraordinary Focusing Effect of Surface Nanolenses in Total Internal Reflection Mode

Dyett, B, Zhang, Q, Xu, Q, Wang, X and Zhang, X 2018, 'Extraordinary Focusing Effect of Surface Nanolenses in Total Internal Reflection Mode', ACS Central Science, vol. 4, no. 11, pp. 1511-1519.


Document type: Journal Article
Collection: Journal Articles

Title Extraordinary Focusing Effect of Surface Nanolenses in Total Internal Reflection Mode
Author(s) Dyett, B
Zhang, Q
Xu, Q
Wang, X
Zhang, X
Year 2018
Journal name ACS Central Science
Volume number 4
Issue number 11
Start page 1511
End page 1519
Total pages 9
Publisher Americal Chemical Society
Abstract Microscopic lenses are paramount in solar energy harvesting, optical devices, and imaging technologies. This work reports an extraordinary focusing effect exhibited by a surface nanolens (i.e., with at least one dimension of subwavelength) that is situated in an evanescent field from the total internal reflection (TIR) of light illuminated to the supporting substrate above the critical angle. Our measurements show that the position, shape, and size of the surface area with enhanced light intensity are determined by the geometry of the nanolens and the incident angle, in good agreement with simulation results. This strong focusing effect of the surface nanolens is shown to significantly promote the plasmonic effect of deposited gold nanoparticles on the lens surface inlight conversion and to vaporize surrounding water to microbubbles by using low laser power. This work further demonstrates that the light redistribution by the surface nanolens in TIR enables a range of novel applications in selectively local visualization of specimens in fluorescence imaging, optical trapping of colloids from an external flow, and selective materials deposition from photoreactions.
Subject Colloid and Surface Chemistry
DOI - identifier 10.1021/acscentsci.8b00501
Copyright notice © 2018 American Chemical Society
ISSN 2374-7951
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