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上海光机所第七期“青年科技创新论坛”通知

来源： 发布时间：2014-03-18【字体：大 中 小】

论坛主要报告题目：Deposition of nanoparticle metal films using nanosecond and femtosecond lasers

主讲人：Prof. James Lunney

开始时间：2014-03-19 15:00

结束时间：2014-03-19 17:00

讲座地址:1号楼108会议室

主办单位：上海光机所青年创新促进会小组

 

Prof. James Lunney

 

Professional Career:

2011-Present Head of School of Physics, Trinity College Dublin
2005-2008 Head of School of Physics, Trinity College Dublin
2005-2008 Centre for Research on Adaptive Nanostructures and Nanodevices Board Member
2002-2005 Trinity College Board Member
1998-Present Associate Professor, School of Physics, Trinity College Dublin
1994-1998 Senior Lecturer, School of Physics, Trinity College Dublin
1993 Visiting Professor, Universite de Grenoble, France
1980-1994 Lecturer, Department of Physics, Trinity College Dublin

Prof. James Lunney leads a research group whose interests are based around photonics; high power laser-matter interactions, with emphasis on pulsed laser ablation of solid materials, pulsed laser deposition of solid and nanoparticle thin films of functional materials for research, the development of novel magnetic and electrical methods for controlling the conditions in laser produced plasmas and conical refraction of light in biaxial crystals.

Abstract:Pulsed laser deposition (PLD) is a relatively simple technique for the preparation of metal nanoparticle (NP) films which are free from chemical contamination. I will describe the results of some recent work on PLD of metal NP films using both between nanosecond (ns) and femtosecond (fs) lasers. We have studied the dynamics of both the plasma and nanoparticle ablation plumes using Langmuir probe, optical emission spectroscopy and time-resolved optical absorption. In nsPLD ablation plume is strongly ionised and the NPs form by surface diffusion on the substrate. In fsPLD a smaller fraction of the ablated material is removed as a plasma plume moving at ~106 cm s-2,and a larger fraction leaves the target as a hot nanoparticle mist moving at ~2×104 cm s-2.We describe both the optical emission and absorption properties of the nanoparticle mist by taking account of the wavelength dependence of the nanoparticle emissivity. The energy efficiencies of ns and fs laser ablation were measured and the ablation plume dynamics were compared. For silver NP distributions were measured using transmission electron mcroscopy; in both cases the mean particle size was found to increase as the eqivalent solid-density thickness of the depsoit increased. The films displayed the expected surface plasmon resonance in the visible optical spectrum. We have benchmarked the SERS performance of these sliver NP films against a commerical substrate.

 

 

 

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