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Substrate surface patterning by optical near field modulation around colloidal particles immersed in a liquid
- Source :
- Ulmeanu, M, Petkov, P, Ursescu, D, Jipa, F, Harniman, R, Brousseau, E & Ashfold, M N R 2016, ' Substrate surface patterning by optical near field modulation around colloidal particles immersed in a liquid ', Optics Express, vol. 24, no. 24, pp. 27340-27351 . https://doi.org/10.1364/OE.24.027340, Ulmeanu, M, Petkov, P V, Ursescu, D, Harniman, R L, Brousseau, E & Ashfold, M N R 2016, ' Substrate surface patterning by optical near field modulation around colloidal particles immersed in a liquid ', Optics Express, vol. 24, no. 24, pp. 27340-27351 . https://doi.org/10.1364/OE.24.027340
- Publication Year :
- 2016
- Publisher :
- The Optical Society, 2016.
-
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.
- Subjects :
- Range (particle radiation)
Materials science
Silicon
business.industry
Mie scattering
chemistry.chemical_element
Near and far field
02 engineering and technology
021001 nanoscience & nanotechnology
Laser
01 natural sciences
Atomic and Molecular Physics, and Optics
law.invention
010309 optics
Ray tracing (physics)
Optics
chemistry
law
0103 physical sciences
Particle
0210 nano-technology
business
Refractive index
Subjects
Details
- ISSN :
- 10944087
- Volume :
- 24
- Database :
- OpenAIRE
- Journal :
- Optics Express
- Accession number :
- edsair.doi.dedup.....31133e0cab5c2c2284fdc93fceb054c5