Creating Double Optical Trap Using Fresnel Lens

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Farajian, Mahboubeh | 2018

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Type of Document: M.Sc. Thesis
Language: Farsi
Document No: 51497 (04)
University: Sharif University of Technology
Department: Physics
Advisor(s): Seyed Reihani, Nader
Abstract:
Intensity or phase Modulation of a wavefront is possible by means of optical devices. Placing a grating or lens on the way of a wavefront, will alter the phase or intensity of it and this will make a diffraction pattern. Spatial Light Modulator (SLM) is an optical device which is the most important part of a video projector. One can apply grating, lens and other phases on the wavefront using this device.In this project we used SLM to modify phase of laser beam and then we made many focal points such that they could displace independently. The result of this project can be used in designing and creating a holographic optical tweezers.Moreover, A. Einstein proved that the light could be deflected while transmitting near a massive object and deflection of light is the reason of gravitational lensing. In the second part of this project,we calculated the gravitational lens phase and applied it to the laser beam using SLM and rebuilt the gravitational lens in our laboratory
Keywords:
Optical Tweezer ; Gravitational Lens ; Spatial Light Modulator (SLM) ; Optical Trapping ; Fresnel Lens ; Multi Trap