Trapping, Levitation, and Optomechanics of Nanoparticles

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Jazayeri, Amir Mohammad | 2019

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Type of Document: Ph.D. Dissertation
Language: Farsi
Document No: 52526 (05)
University: Sharif University of Technology
Department: Electrical Engineering
Advisor(s): Mehrany, Khashayar
Abstract:
The electromagnetic (EM) force is the pivot on which this thesis revolves. We inspect different formulations of the distribution of the EM force (and momentum) inside matter, and show that the Einstein-Laub force density is incompatible with special relativity. We study the exerted EM force on small particles in depth, and explain when the conventional dipole approximation fails to yield accurate results. We propose an all-dielectric structure which is able to trap very small dielectric particles (of diameters as small as 10 nm). One of the achievements of this thesis is an explanation for an adverse phenomenon observed in many experiments on the optomechanical systems employing nanoparticles, whether the systems are resonator-based or feedback-based. Also, we analyze three implementations of such optomechanical systems thoroughly. A full description of the quantum fluctuations in the EM force exerted on a small particle is presented for the first time in this thesis
Keywords:
Optical Tweezer ; Dipole Approximation ; Electromagnetic Force ; Quantum Fluctuations ; Optomechanics ; Electromagnetic Force Density

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