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Optically Trapped Microspheres as Sensors of Mass and Sound

160,49 €*

Sofort verfügbar, Lieferzeit: 1-3 Tage

Produktnummer: 18c73d9fc119214b01924ac9718c545048
Autor: Hillberry, Logan Edward
Themengebiete: Brownian motion Einstein-Ornstein-Uhlenbeck theory High-precision sensing Inertial mass sensing Mie scattering Optical trapping Optical tweezers Sound detection
Veröffentlichungsdatum: 18.11.2023
EAN: 9783031443312
Sprache: Englisch
Seitenzahl: 115
Produktart: Gebunden
Verlag: Springer International Publishing
Untertitel: Brownian Motion as Both Signal and Noise
Produktinformationen "Optically Trapped Microspheres as Sensors of Mass and Sound"
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.

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