Expand this Topic clickable element to expand a topic
Skip to content
Optica Publishing Group

Optimization of probe-laser focal offsets for single-particle tracking

Not Accessible

Your library or personal account may give you access

Abstract

In optical tweezers applications, tracking a trapped particle is essential for force measurement. One of the most popular techniques for single-particle tracking is achieved by analyzing the forward and backward light pattern, scattered by the target particle trapped by a trap laser beam, of an additional probe-laser beam with different wavelength whose focus is slightly apart from the trapping center. However, the optimized focal offset has never been discussed. In this paper, we investigate the tracking range and sensitivity as a function of the focal offset between the trapping and the probe-laser beams. As a result, the optimized focal offsets are a 3.3-fold radius ahead and a 2.0-fold radius behind the trapping laser focus in the forward tracking and the backward tracking, respectively. The experimental result agrees well with a theoretical prediction using the Mie scattering theory.

© 2012 Optical Society of America

Full Article  |  PDF Article
More Like This
Back-focal-plane position detection with extended linear range for photonic force microscopy

Ignacio A. Martínez and Dmitri Petrov
Appl. Opt. 51(25) 5973-5977 (2012)

Probing the dynamics of an optically trapped particle by phase sensitive back focal plane interferometry

Basudev Roy, Sambit Bikas Pal, Arijit Haldar, Ratnesh Kumar Gupta, Nirmalya Ghosh, and Ayan Banerjee
Opt. Express 20(8) 8317-8328 (2012)

Two particle tracking and detection in a single Gaussian beam optical trap

P. Praveen, Yogesha, Shruthi S. Iyengar, Sarbari Bhattacharya, and Sharath Ananthamurthy
Appl. Opt. 55(3) 585-594 (2016)

Cited By

You do not have subscription access to this journal. Cited by links are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access Optica Member Subscription

Figures (6)

You do not have subscription access to this journal. Figure files are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access Optica Member Subscription

Equations (10)

You do not have subscription access to this journal. Equations are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access Optica Member Subscription

Select as filters


Select Topics Cancel
© Copyright 2024 | Optica Publishing Group. All Rights Reserved