Theoretical simulation of Gaussian beam interferometric optical tweezers with symmetrical construction

Abstract

Multi-beam optical tweezers can be very effective and suitable for creating optical lattices and dexterous manipulation of the microscopic world. In an earlier work, a symmetrical multi-beam optical tweezers setup was proposed and theoretically investigated. In that study, however, we assumed that the incident beams were plane waves, and a plane wave cannot exist in real situations. The main aim of this paper is to investigate multi-beam optical tweezers under the realistic condition of using the Gaussian beams. The effects of changing the polarization state and the number of incident beams on potential landscapes are investigated. A comparison between the Gaussian beam and plane wave lattices is also performed. The results show that in the case of p-polarization, a very small spot (a sub-λ spot) can be achieved by increasing the number of incident beams. However, for s-polarized incident beams instead of a bright center, a dark center intensity distribution is obtained. The lattices constructed by the interference of the Gaussian beams have deeper traps in the central region compared to the plane wave lattices.

Study on surface enhanced Raman scattering of Au and Au@Al2O3 spherical dimers based on 3D finite element method

“…The peak value of enhancement factor is 1.5 ~ 3 times for the other peaks. The intensity of the electric field decreases slightly at 600 ~ 650 nm and then peaks, probably due to the interference of incident light with the scattered radiation 30 . Figure 4 b also calculates the Au dimer Raman enhancement factor at excitation wavelength of 635 nm.…”

Study on Surface Enhanced Raman Scattering of Au and Au@Al2O3 Spherical Dimers Based on 3D Finite Element Method

“…The peak value of enhancement factor is 1.5 ~ 3 times for the other peaks. The intensity of the electric eld decreases slightly at 600 nm 650 nm and then peaks, probably due to the interference of incident light with the scattered radiation 24 . This electric eld enhancement factor is a very groundbreaking discovery and provided a reliable data support for SERS development.…”

Light-driven nanomotors with reciprocating motion and high controllability based on interference techniques

“…In our earlier studies, we suggested a number of different interferometric trapping setups, and their potential applications in optical manipulation were discussed. [19][20][21][22] A dynamic control over periodic interference traps can enhance the capabilities of such periodic patterns and pave the way to some great new applications. One way to do this is to use holographic techniques, 23 but the manipulability of holographic methods is considerably limited by the speed of the beam control.…”

“…In our earlier studies, we suggested a number of different interferometric trapping setups, and their potential applications in optical manipulation were discussed. 19–22…”