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Book Cover
E-book
Author Hillberry, Logan Edward, author

Title Optically trapped microspheres as sensors of mass and sound : Brownian motion as both signal and noise / Logan Edward Hillberry
Published Cham : Springer, 2023

Copies

Description 1 online resource (xvi, 115 pages) : illustrations (some color)
Series Springer theses, 2190-5061
Springer theses, 2190-5061
Contents Chapter 1. Introduction -- Chapter 2. Technical Background -- Chapter 3. Experimental set-up -- Chapter 4. Results -- Chapter 5. Conclusions
Summary This thesis makes significant advances in the use of microspheres in optical traps as highly precise sensing platforms. While optically trapped microspheres have recently proven their dominance in aqueous and vacuum environments, achieving state-of-the-art measurements of miniscule forces and torques, their sensitivity to perturbations in air has remained relatively unexplored. This thesis shows that, by uniquely operating in air and measuring its thermally-fluctuating instantaneous velocity, an optically trapped microsphere is an ultra-sensitive probe of both mass and sound. The mass of the microsphere is determined with similar accuracy to competitive methods but in a fraction of the measurement time and all while maintaining thermal equilibrium, unlike alternative methods. As an acoustic transducer, the air-based microsphere is uniquely sensitive to the velocity of sound, as opposed to the pressure measured by a traditional microphone. By comparison to state-of-the-art commercially-available velocity and pressure sensors, including the world⁰́₉s smallest measurement microphone, the microsphere sensing modality is shown to be both accurate and to have superior sensitivity at high frequencies. Applications for such high-frequency acoustic sensing include dosage monitoring in proton therapy for cancer and event discrimination in bubble chamber searches for dark matter. In addition to reporting these scientific results, the thesis is pedagogically organized to present the relevant history, theory, and technology in a straightforward way
Notes "Doctoral thesis accepted by the University of Texas at Austin, USA."
Bibliography Includes bibliographical references
Notes Online resource; title from PDF title page (SpringerLink, viewed November 21, 2023)
Subject Brownian motion processes.
Microspheres.
Form Electronic book
ISBN 9783031443329
3031443322