Virtual potentials for feedback traps

NCU Institutional Repository > 理學院 > 物理學系 > 期刊論文 > Item 987654321/108451

jsp.display-item.identifier=請使用永久網址來引用或連結此文件: https://ir.lib.ncu.edu.tw/handle/987654321/108451

题名:	Virtual potentials for feedback traps
作者:	田溶根;Jun, Yonggun;Bechhoefer, John
贡献者:	理學院物理學系
日期:	2012-12-05
上传时间:	2026-04-23 14:50:02 (UTC+8)
出版者:	American Physical Society;United States
摘要:	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
显示于类别:	[物理學系] 期刊論文

文件中的档案:

档案	描述	大小	格式	浏览次数
index.html		0Kb	HTML	26	检视/开启

在NCUIR中所有的数据项都受到原著作权保护.

社群 sharing

数据加载中.....