Substrate surface patterning by optical near field modulation around colloidal particles immersed in a liquid

Ulmeanu, M., Petkov, Petko ORCID: https://orcid.org/0000-0003-2185-2651, Ursescu, D., Jipa, F., Harniman, R, Brousseau, Emmanuel Bruno Jean Paul ORCID: https://orcid.org/0000-0003-2728-3189 and Ashfold, M. 2016. Substrate surface patterning by optical near field modulation around colloidal particles immersed in a liquid. Optics Express 24 (24) , pp. 27340-27351. 10.1364/OE.24.027340

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Abstract

Optical near field enhancements in the vicinity of particles illuminated by laser light are increasingly recognized as a powerful tool for nanopatterning applications, but achieving sub-wavelength details from the near-field distribution remains a challenge. Here we present a quantitative analysis of the spatial modulation of the near optical fields generated using single 8 ps, 355 nm (and 532 nm) laser pulses around individual colloidal particles and small close packed arrays of such particles on silicon substrates. The analysis is presented for particles in air and, for the first time, when immersed in a range of liquid media. Immersion in a liquid allows detailed exploration of the effects on the near field of changing not just the magnitude but also the sign of the refractive index difference between the particle and the host medium. The level of agreement between the results of ray tracing and Mie scattering simulations, and the experimentally observed patterns on solid surfaces, should encourage further modelling, predictions and demonstrations of the rich palette of sub-wavelength surface profiles that can be achieved using colloidal particles immersed in liquids.

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Centre for Advanced Manufacturing Systems At Cardiff (CAMSAC) Engineering
Publisher:	Optical Society of America
ISSN:	1094-4087
Date of First Compliant Deposit:	9 January 2017
Date of Acceptance:	28 October 2016
Last Modified:	11 Oct 2023 19:46
URI:	https://orca.cardiff.ac.uk/id/eprint/96221

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