טכניון מכון טכנולוגי לישראל
הטכניון מכון טכנולוגי לישראל - בית הספר ללימודי מוסמכים  
Ph.D Thesis
Ph.D StudentGreenfield Elad
SubjectAspects of Light-Fluid Interactions
DepartmentDepartment of Physics
Supervisor ? 18? Mordechai Segev
Full Thesis textFull thesis text - English Version


Abstract

Light-Fluid interactions give rise to physical phenomena that are fundamentally different from those encountered when light interacts with solids. The mobility of the fluid, the possibility to optically induce deformations in the flow field, the important role of diffusion and convection in transporting heat and substance, and the large-scale heterogeneities emerging when fluid interacts with light - all contribute to the variety of nonlinear interactions unique to light-fluid systems. Examples of such phenomena range from optically-induced flow and optically induced hydrodynamic instabilities, to optical-force induced self-focusing and self-channeling of light in colloidal suspensions.

In this thesis, I explored a group of light-fluid systems, arising when light and fluid interact forming complex nonlinear dynamic systems. Each of the works presented in this thesis contributes physical understanding, and in some cases- first ever observations, of a variety of light-fluid phenomena. The key scientific issues that were investigated throughout this thesis range from the universal properties of accelerating light beams, to the mechanisms driving thermal-lens oscillations to chaos, first-ever exploration of the dynamics of the interaction of strong light fields with strongly scattering fluidic suspensions, and a method of designing and shaping sub diffraction-limited optical structures that do not broaden as they propagate in free space.