Rapid tilted-plane Gerchberg-Saxton algorithm for holographic optical tweezers

Author(s):

Yanan Cai, Shaohui Yan, Zhaojun Wang, Runze Li, Yansheng Liang, Yuan Zhou, Xing Li, Xianghua Yu, Ming Lei and Baoli Yao

Abstract:

“Benefitting from the development of commercial spatial light modulator (SLM), holographic optical tweezers (HOT) have emerged as a powerful tool for life science, material science and particle physics. The calculation of computer-generated holograms (CGH) for generating multi-focus arrays plays a key role in HOT for trapping of a bunch of particles in parallel. To realize dynamic 3D manipulation, we propose a new tilted-plane GS algorithm for fast generation of multiple foci. The multi-focal spots with a uniformity of 99% can be generated in a tilted plane. The computation time for a CGH with 512512 pixels is less than 0.1 second.
We demonstrated the power of the algorithm by simultaneously trapping and rotating silica beads with a 77 spots array in three dimensions. The presented algorithm is expected as a powerful kernel of HOT.”

Link to Publications Page

Publication: Optics Express

Issue/Year/DOI: Vol. 28, Issue 9, pp. 12729-12739
DOI: 10.1364/OE.389897

Anomalous ring-connected optical vortex array

Author(s):

Xinzhong Li and Hao Zhang

Abstract:

“In this study, an anomalous ring-connected optical vortex array (ARC-OVA) via the superposition of two grafted optical vortices (GOVs) with different topological charges (TCs) has been proposed. Compared with conventional OVAs, the signs and distribution of the OVs can be individually modulated, while the number of OVs remains unchanged. In particular, the positive and negative OVs simultaneously appear in the same intensity ring. Additionally, the size of the dark core occupied by the OV can be modulated, and the specific dark core is shared by a pair of plus–minus OVs. This work deepens our knowledge about connected OVAs and facilitates new potential applications, especially in particle manipulation and optical measurement.”

Link to Publications Page

Publication: Optics Express

Issue/Year/DOI: Vol. 28, Issue 9, pp. 13775-13785
DOI: 10.1364/OE.390985