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Theoretical analysis of polymeric and crystalline thick films melting with a single gold nanoparticle embedded in a transparent matrix under nanosecond pulsed laser excitation

Rahimi, L ; Sharif University of Technology | 2012

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  1. Type of Document: Article
  2. DOI: 10.1088/0022-3727/45/47/475306
  3. Publisher: 2012
  4. Abstract:
  5. Optothermal properties of noble metal nanoparticles can be used in a wide range of applications. This paper presents the results of a theoretical study on the utilization of laser-induced heating of a gold nanoparticle (GNP) to melt a region of a transparent material with sub-wavelength spatial resolution. The considered system consists of a 10 or 15nm diameter GNP fixed inside a silica substrate. The silica surface is covered with a thick film of the transparent polymeric or crystalline material. The heating and melting processes are studied under a 7.5ns pulsed laser illumination. Calculations are conducted under three temperature limits, on the maximum temperature of the free electrons, the maximum temperature of the GNP and the maximum temperature of the film layer. The temperature limits lead to the limiting of the average laser power. The maximum allowable value of the average laser power and the effect of various parameters on spatial characteristics of the molten region are considered
  6. Keywords:
  7. Film layers ; Free electron ; Gold nanoparticle ; Gold Nanoparticles ; Laser illumination ; Laser power ; Laser-induced heating ; Maximum temperature ; Melting process ; Molten region ; Nanosecond pulsed laser ; Silica substrate ; Silica surface ; Spatial characteristics ; Spatial resolution ; Sub-wavelength ; Temperature limits ; Theoretical study ; Three temperature ; Transparent material ; Transparent matrix ; Crystalline materials ; Gold ; Laser excitation ; Lasers ; Metal nanoparticles ; Silica ; Temperature ; Thick films ; Polymers
  8. Source: Journal of Physics D: Applied Physics ; Volume 45, Issue 47 , 2012 ; 00223727 (ISSN)
  9. URL: http://iopscience.iop.org/article/10.1088/0022-3727/45/47/475306/meta;jsessionid=8486B9B4943F938E9D568D6C82898E0D.c3.iopscience.cld.iop.org