Springer Theses

Fundamental Tests of Physics with Optically Trapped Microspheres

Authors: Li, Tongcang

  • Nominated by the University of Texas at Austin, USA, as an outstanding Ph.D. thesis
  • Represents an important step toward studying the quantum behaviors of a macroscopic particle trapped in vacuum
  • Presents the first measurement of the instantaneous velocity of a particle undergoing Brownian motion
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About this book

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 studied 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.

About the authors

Tongcang Li received his Ph.D in Physics at the University of Texas at Austin in 2011, where he received the Outstanding Dissertation in Physics award by the Department of Physics. He is currently in the Nanoscale Science and Engineering Center at the University of California, Berkeley as a Postdoctoral Fellow. Previous positions include Graduate Research Assistant in the Center for Nonlinear Dynamics and Department of Physics at the University of Texas at Austin, as well as Postdoctoral Fellow at the University of Texas at Austin.

Table of contents (7 chapters)

  • Introduction

    Li, Tongcang

    Pages 1-7

  • Physical Principle of Optical Tweezers

    Li, Tongcang

    Pages 9-20

  • Optical Trapping of Glass Microspheres in Air and Vacuum

    Li, Tongcang

    Pages 21-38

  • Measuring the Instantaneous Velocity of a Brownian Particle in Air

    Li, Tongcang

    Pages 39-58

  • Towards Measurement of the Instantaneous Velocity of a Brownian Particle in Water

    Li, Tongcang

    Pages 59-79

Buy this book

eBook $99.00
price for USA (gross)
  • ISBN 978-1-4614-6031-2
  • Digitally watermarked, DRM-free
  • Included format: PDF
  • ebooks can be used on all reading devices
  • Immediate eBook download after purchase
Hardcover $129.00
price for USA
  • ISBN 978-1-4614-6030-5
  • Free shipping for individuals worldwide
  • Usually dispatched within 3 to 5 business days.
Rent the ebook  
  • Rental duration: 1 or 6 month
  • low-cost access
  • online reader with highlighting and note-making option
  • can be used across all devices
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Bibliographic Information

Bibliographic Information
Book Title
Fundamental Tests of Physics with Optically Trapped Microspheres
Authors
Series Title
Springer Theses
Copyright
2013
Publisher
Springer-Verlag New York
Copyright Holder
Springer Science+Business Media New York
eBook ISBN
978-1-4614-6031-2
DOI
10.1007/978-1-4614-6031-2
Hardcover ISBN
978-1-4614-6030-5
Series ISSN
2190-5053
Edition Number
1
Number of Pages
XII, 125
Topics