Optically Trapped Microspheres as Sensors of Mass and Sound: Brownian Motion as Both Signal and Noise...

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Logan Edward Hillberry

Optically Trapped Microspheres as Sensors of Mass and Sound

Brownian Motion as Both Signal and Noise

Logan Edward Hillberry

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English

Springer International Publishing AG
18 November 2023

Scientific standards; Mensuration & systems of measurement; Wave mechanics (vibration & acoustics); Light (optics); Atomic & molecular physics

Series: Springer Theses

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 world’s 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.

By: Logan Edward Hillberry
Imprint: Springer International Publishing AG
Country of Publication: Switzerland
Edition: 2023 ed.
Dimensions: Height: 235mm, Width: 155mm,
Weight: 371g
ISBN: 9783031443312
ISBN 10: 3031443314
Series: Springer Theses
Pages: 115
Publication Date: 18 November 2023
Audience: College/higher education , Professional and scholarly , Further / Higher Education , Undergraduate
Format: Hardback
Publisher's Status: Active

Chapter 1. Introduction.- Chapter 2. Technical Background.- Chapter 3. Experimental set-up.- Chapter 4. Results.- Chapter 5. Conclusions.

Logan completed his PhD in physics at the University of Texas at Austin in 2022 under the supervision of Professor Mark Raizen. Now, Logan continues to work as a postdoctoral fellow in the same group while coordinating his next position. Previously, he earned an MS in applied physics, under the supervision of Professor Lincoln Carr, and a BS in engineering physics from the Colorado School of Mines. Logan has broad research interests ranging from acoustics to quantum many-body dynamics. He particularly enjoys numerics for simulation and data analysis, and building instruments to make new measurements.