Forces on a nanoparticle in an optical trap

TL;DR

This paper analyzes the forces acting on a nanoparticle in an optical trap, addressing challenges like Brownian motion and proposing electric field configurations to improve trapping stability, supported by theoretical and numerical analysis.

Contribution

It introduces a theoretical framework incorporating temperature effects and suggests electric field distributions to enhance nanoparticle trapping stability.

Findings

Brownian motion significantly affects trapping stability

Optimal electric field distributions can improve trapping force

Numerical simulations confirm the effectiveness of proposed methods

Abstract

Forces on a nanoparticle in an optical trap are analysed. Brownian motion is found to be one of the major challenges to trap a nanoparticle. Accordingly, suitable spatial electric field distribution of laser beam is suggested to enhance the trapping force on a nanoparticle. Theoretical analysis is carried out to obtain conditions for stable optical trap by incorporating the temperature variation at large laser intensities. Numerical analysis is made for single quantum dot of CdS in buffer solution irradiated by an Nd:YAG laser.