Macquarie University
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Using Bessel-Gaussian beam in optical trapping of nanoparticles for gensitive gravimetry

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posted on 2022-03-28, 16:22 authored by Md Iftekher Selim Chowdhury
Over the past decade, researchers have developed very sensitive force detection techniques including yoctonewton (10−24 N) force measurement, yoctogram-scale mass sensitivity and femto-scale magnetic field sensing. However, the measurement of gravitational or inertial forces to such high precision still to date remains a scientific and technological challenge. Compact integrated room temperature inertial sensors capable of sensing ultra-small changes in inertial forces is still lacking.In this thesis, I propose an all-optically controlled novel design for performing sensitive gravimetry based on trapped and levitated nanoparticles using Bessel-Gaussian beams. I particularly focus on the characterization of Bessel-Gaussian beam and its challenges and application in optical trapping. Optical trapping in vacuum and air has near-complete mechanical isolation from the environment. Without the need for clamping mechanism and robust decoupling from surrounding environment, the all-optical trapping and cooling techniques will yield potentially ultrahigh Q-factor resulting in ultrasensitive force detection at room temperature.


Table of Contents

Chapter 1: Introduction and motivation -- Chapter 2: Physics of optical trapping and introduction to Bessel beams -- Chapter 3: Spatial characterization Bessel-Gaussian Beam: Lens-Axicon System -- Chapter 4: Initial implementation of optical trapping -- Chapter 5: Conclusion and future work -- Chapter 6: Bibliography.


Bibliography: pages 54-59 Theoretical thesis.

Awarding Institution

Macquarie University

Degree Type

Thesis MRes


MRes, Macquarie University, Faculty of Science and Engineering, Department of Physics and Astronomy

Department, Centre or School

Department of Physics and Astronomy

Year of Award


Principal Supervisor

Gabriel Molina-Terriza


Copyright Md Iftekher Selim Chowdhury 2017. Copyright disclaimer:




1 online resource (60 pages)

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