Virtual potentials for feedback traps

Please use this identifier to cite or link to this item: https://ir.lib.ncu.edu.tw/handle/987654321/108451

Title:	Virtual potentials for feedback traps
Authors:	田溶根;Jun, Yonggun;Bechhoefer, John
Contributors:	理學院物理學系
Date:	2012-12-05
Issue Date:	2026-04-23 14:50:02 (UTC+8)
Publisher:	American Physical Society;United States
Abstract:	摘要： The recently developed feedback trap can be used to create arbitrary virtual potentials, to explore the dynamics of small particles or large molecules in complex situations. Experimentally, feedback traps introduce several finite time scales: There is a delay between the measurement of a particle's position and the feedback response, the feedback response is applied for a finite update time, and a finite camera exposure integrates motion. We show how to incorporate such timing effects into the description of particle motion. For the test case of a virtual quadratic potential, we give the first accurate description of particle dynamics, calculating the power spectrum and variance of fluctuations as a function of feedback gain, testing against simulations. We show that for small feedback gains, the motion approximates that of a particle in an ordinary harmonic potential. Moreover, if the potential is varied in time, for example by varying its stiffness, the work that is calculated approximates that done in an ordinary changing potential. The quality of the approximation is set by the ratio of the update time of the feedback loop to the relaxation time of motion in the virtual potential. 其他題名： Phys Rev E Stat Nonlin Soft Matter Phys 出版者： United States 出版日期： 2012-12 出處： Physical review. E, Statistical, nonlinear, and soft matter physics, 2012-12, Vol.86 (6), p.061106, Article 061106 識別號： ISSN: 1539-3755 識別號： ISSN: 1550-2376 識別號： EISSN: 1550-2376 識別號： DOI: 10.1103/PhysRevE.86.061106 識別號： PMID: 23367892
Appears in Collections:	[Department of Physics] journal & Dissertation

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