On the spatiotemporal control with a single beam femtosecond optical tweezer

Debabrata Goswami

doi:10.1117/12.2595198

1 August 2021 On the spatiotemporal control with a single beam femtosecond optical tweezer

Debabrata Goswami

Proceedings Volume 11798, Optical Trapping and Optical Micromanipulation XVIII; 117981Y (2021) https://doi.org/10.1117/12.2595198
Event: SPIE Nanoscience + Engineering, 2021, San Diego, California, United States

Abstract

Spatiotemporal control refers to the simultaneous control over the position and time variables during the dynamics of an event. The monitoring of fundamental processes at microscopic lengths and ultrashort timescales is typically intertwined with the interaction of light with matter. Optical trapping for spatial control results in the immobilization of microscopic objects with light pressure from a tightly focused laser beam and has wide-ranging applications. Conventional single-beam optical tweezers use continuous-wave lasers for spatial control through photon flux but are lacking in temporal control aspects. Pulsed lasers can control the dynamics of the process being studied and thus provide a temporal control knob by enabling the circumvention of relaxation processes. The tradeoff, however, is that this spatial control knob becomes more dependent on the frequency of the light source. The high photon flux requirement of stable optical tweezers with pulsed lasers necessitates femtosecond pulse shaping at a rapid repetition rate, which has been a barrier until recently. We present a generalized model to describe thermal effects for optical tweezers, capable of treating pulsed lasers systems (which differ in instantaneous interaction effects) as well as CW systems (which can be understood as a limiting case of our model). The model has nonlinear optical (NLO) interactions included prima-facie and can describe pulsed laser tweezers in areas where they excel, like the two-photon-fluorescence-based detection. A key result obtained from our model is the fact that NLO interactions can be used to balance out thermal effects.

Conference Presentation

Citation Download Citation

Debabrata Goswami "On the spatiotemporal control with a single beam femtosecond optical tweezer", Proc. SPIE 11798, Optical Trapping and Optical Micromanipulation XVIII, 117981Y (1 August 2021); https://doi.org/10.1117/12.2595198

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available