Binary square axicon with chiral focusing properties for optical trapping

Balasubramani Vinoth*, Anand Vijayakumar, Mani Ratnam Rai, Joseph Rosen, Chau Jern Cheng, Oleg V. Minin, Igor V. Minin

*此作品的通信作者

    研究成果: 雜誌貢獻期刊論文同行評審

    6 引文 斯高帕斯(Scopus)

    摘要

    We introduce a novel phase-only diffractive optical element called chiral binary square axicon (CBSA). The CBSA is designed by linearly rotating the square half-period zones of the binary square axicon with respect to one another. A quadratic phase mask (QPM) is combined with the CBSA using modulo-2πphase addition technique to bring the far-field intensity pattern of CBSA at the focal plane of the QPM and to introduce quasiachromatic effects. The periodically rotated zones of CBSA produce a whirlpool phase profile and twisted intensity patterns at the focal plane of QPM. The degree of twisting seen in the intensity patterns is dependent upon the angular step size of rotation of the zones. The intensity pattern was found to rotate around the optical axis along the direction of propagation. The phase patterns of CBSA with different angles of zone rotation are displayed on a phase-only spatial light modulator, and the experimental results were found to match with the simulation results. To evaluate the optical trapping capabilities of CBSA, an optical trapping experiment was carried out and the optical fields generated by CBSA were used for trapping and rotating yeast cells.

    原文英語
    文章編號041204
    期刊Optical Engineering
    59
    發行號4
    DOIs
    出版狀態已發佈 - 2020 四月 1

    ASJC Scopus subject areas

    • 原子與分子物理與光學
    • 工程 (全部)

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