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024 7 $a10.1007/978-1-4614-6031-2
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035   $a(EBL)1082064
035   $a(OCoLC)820022402
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035   $a(DE-He213)978-1-4614-6031-2
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100   $a20121203d2013      uy         0
101 0 $aeng
135   $aur|n|---|||||
181   $ctxt
182   $cc
183   $acr
200 10$aFundamental tests of physics with optically trapped microspheres /$fTongcang Li
205   $a1st ed. 2013.
210   $aNew York $cSpringer$dc2013
215   $a1 online resource (134 p.)
225  0$aSpringer theses
300   $aDescription based upon print version of record.
311   $a1-4614-6030-1 
320   $aIncludes bibliographical references.
327   $aIntroduction -- 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 -- Appendix.
330   $aFundamental Tests of Physics with Optically Trapped Microspheres details experiments on studying the Brownian motion of an optically trapped microsphere with ultrahigh resolution and the cooling of its motion towards the quantum ground state. Glass microspheres were trapped in water, air, and vacuum with optical tweezers; and a detection system that can monitor the position of a trapped microsphere with Angstrom spatial resolution and microsecond temporal resolution was developed to study the Brownian motion of a trapped microsphere in air over a wide range of pressures. The instantaneous velocity of a Brownian particle, in particular, was measured for the very first time, and the results provide direct verification of the Maxwell-Boltzmann velocity distribution and the energy equipartition theorem for a Brownian particle. For short time scales, the ballistic regime of Brownian motion is observed, in contrast to the usual diffusive regime. In vacuum, active feedback is used to cool the center-of-mass motion of an optically trapped microsphere from room temperature to a minimum temperature of about 1.5 mK. This is an important step toward studying the quantum behaviors of a macroscopic particle trapped in vacuum.
410  0$aSpringer Theses, Recognizing Outstanding Ph.D. Research,$x2190-5053
606   $aMicrophysics
606   $aOptical tweezers
615  0$aMicrophysics.
615  0$aOptical tweezers.
676   $a530.475
700   $aLi$b Tongcang$0935772
801  0$bMiAaPQ
801  1$bMiAaPQ
801  2$bMiAaPQ
906   $aBOOK
912   $a9910438113003321
996   $aFundamental Tests of Physics with Optically Trapped Microspheres$92108082
997   $aUNINA