Optically Trapped Microspheres as Sensors of Mass and Sound : Brownian Motion as Both Signal and Noise / by Logan Edward Hillberry.

Format:

Book

Author/Creator:

Hillberry, Logan Edward.

Series:

Springer Theses, Recognizing Outstanding Ph.D. Research, 2190-5061

Language:

English

Subjects (All):

Atoms.

Metrology.

Optics.

Measurement.

Measuring instruments.

Acoustics.

Statistical physics.

Metrology and Fundamental Constants.

Light-Matter Interaction.

Measurement Science and Instrumentation.

Statistical Physics.

Local Subjects:

Metrology and Fundamental Constants.

Light-Matter Interaction.

Measurement Science and Instrumentation.

Acoustics.

Statistical Physics.

Physical Description:

1 online resource (124 pages)

Edition:

1st ed. 2023.

Place of Publication:

Cham : Springer Nature Switzerland : Imprint: Springer, 2023.

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 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.

Contents:

Chapter 1. Introduction

Chapter 2. Technical Background

Chapter 3. Experimental set-up

Chapter 4. Results

Chapter 5. Conclusions.

Notes:

Description based on publisher supplied metadata and other sources.

Other Format:

Print version: Hillberry, Logan Edward Optically Trapped Microspheres As Sensors of Mass and Sound

ISBN:

3-031-44332-2

OCLC:

1410124968