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Fundamental tests of physics with optically trapped microspheres Tongcang Li
Springer Nature - Springer Physics and Astronomy (R0) eBooks 2013 English International Available online
View online- Format:
- Book
- Thesis/Dissertation
- Author/Creator:
- Li, Tongcang
- Series:
- Springer theses
- Language:
- English
- Subjects (All):
- Microphysics.
- Optical tweezers.
- Genre:
- dissertations
- Academic theses
- Physical Description:
- 1 online resource
- Place of Publication:
- New York Springer ©2013
- Language Note:
- English
- Summary:
- Fundamental Tests of Physics with Optically Trapped Microspheres details experiments on studying the Brownian motion of an optically trapped microsphere with ultrahigh resolution and the cooling of its motion towards the quantum ground state. Glass microspheres were trapped in water, air, and vacuum with optical tweezers; and a detection system that can monitor the position of a trapped microsphere with Angstrom spatial resolution and microsecond temporal resolution was developed to study the Brownian motion of a trapped microsphere in air over a wide range of pressures. The instantaneous velocity of a Brownian particle, in particular, was measured for the very first time, and the results provide direct verification of the Maxwell-Boltzmann velocity distribution and the energy equipartition theorem for a Brownian particle. For short time scales, the ballistic regime of Brownian motion is observed, in contrast to the usual diffusive regime. In vacuum, active feedback is used to cool the center-of-mass motion of an optically trapped microsphere from room temperature to a minimum temperature of about 1.5 mK. This is an important step toward studying the quantum behaviors of a macroscopic particle trapped in vacuum
- Contents:
- Physical Principle of Optical Tweezers Optical Trapping of Glass Microspheres in Air and Vacuum Measuring the Instantaneous Velocity of a Brownian Particle in Air Towards Measurement of the Instantaneous Velocity of a Brownian Particle in Water Millikelvin Cooling of an Optically Trapped Microsphere in Vacuum Towards Quantum Ground-State Cooling
- Notes:
- Ph. D. University of Texas at Austin
- Includes bibliographical references
- Print version record
- Other Format:
- Print version Li, Tongcang. Fundamental tests of physics with optically trapped microspheres
- ISBN:
- 9781461460312
- 146146031X
- 1461460301
- 9781461460305
- 9781283910057
- 1283910055
- OCLC:
- 820022402
- Access Restriction:
- Restricted for use by site license
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