טכניון מכון טכנולוגי לישראל
הטכניון מכון טכנולוגי לישראל - בית הספר ללימודי מוסמכים  
M.Sc Thesis
M.Sc StudentOmri Warshavski
SubjectThe Effect of Single Femtosecond Pulses on Gold
Nanoparticles
DepartmentDepartment of Nanoscience and Nanotechnology
Supervisor Professor Yelin Dvir
Full Thesis textFull thesis text - English Version


Abstract

The unique interaction between gold nanoparticles and short laser pulses conceals great potential for future application in large number of fields. The strong near field enhancement and the Nano metric scale length are between the dominant characterizations of this interaction. The development of future application such as Nano manipulation of cells in this functional environment requires understanding of the fundamental mechanisms governing the interaction, a reliable and comprehensive experimental data base is essential to support this knowledge. In this work we present new experimental data acquired by the use of a new technique capable of measuring the extinction spectra of small volumes of nanoparticles immersed in water. We preformed detailed characterization of the changes in the extinction spectra’s of the particle solution following illuminations by single femtosecond laser pulses. The effects of the laser pulse were substantiating by comparison between the distribution of five morphological parameters used to quantify the size and the shape of the particles. The ease of use portray this technique enabled us to examine large number of different parameters, kwon to influence the interaction. Based on the detailed investigation we were able to confirm or reject the existence of possible fundamental mechanisms resulting with the investigated effects.