studied. Also in order to optimize trapping, the effective factors for increasing stability are qualitatively analyzed. Based on the experimental and theoretical results, the higher the stability of the components used in devices, the more stable trapping is achieved.

Key Words: Optical tweezers, Optical trapping, Manipulation, Microscope objective,
Numerical aperture.

Name & Surname: Saeed Imani
Thesis Title: Investigation of Nano-meter-size Object Management with Optical Tweezers
Degree / Major / Field / Faculty:
Graduation Date: 2015

First Supervisor: Hamed Baghban Second Supervisor:
First Advisor: Saeed Gol Mohamadi Second Advisor:
Key Words:Optical tweezers, Optical trapping, Manipulation, Microscope objective,
Numerical aperture.

Abstract:

Optical tweezers are optical traps in which, the trapping and manipulation of particles having the dimension of micrometer to nanometer are done. To provide this purpose, the forces in the range of 10 to 100 pico Newton are required. In this method, the physics of optical forces created by light scattering from the surface of the particles is also analyzed. A highly focused laser beam is used to trap particles. In fact, trapping is performed in the direction of optical axis and the particle is limited to the focal point of the beam (optical tweezers are laser beam which is focused by an objective lens microscope with high numerical aperture). Particles such as atoms, molecules, biological cells, small dielectric spheres and metallic particles can be trapped and manipulated by optical tweezers. Micron-size particles are accelerated by a continuous wave laser with a wavelength out of the absorption region of the particle. These particlesare trapped in a stable potential well due to radiation pressure. Because of the various applications of optical tweezers in medicine, physics, chemistry and so on, in this thesis, trapping particles with the approximately by 3 diameter micron using a single beam optical tweezers is studied. Also in order to optimize trapping, the effective factors for increasing stability are qualitatively analyzed. Based on the experimental and theoretical results, the higher the stability of the components used in devices, the more stable trapping is achieved.

University of Pardis Aras
School of Engineering-Emerging Technologies

Thesis Approved for Master of Science in
Center Of Applied Science Nano Electronics

Title
Investigation of Nano-meter-size Object Management with Optical Tweezers

Name
Saeed Imani

Supervisor(s)
Dr.Hamed Baghban

Advisor(s)
Dr.Saeed Gol Mohamadi

2015