Optical Instruments, Volume. 45, Issue 3, 80(2023)

Enhancement mechanism of chiral signal from spheres based on OAM beams

Yang SUN and Haifeng HU*
Author Affiliations
  • School of Optical-Electrical and Computer Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China
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    In order to analyze the mechanism of chiral signal enhancement of spherical particles, the Mie scattering characteristics of spherical particles are studied based on the T-matrix method, and the mechanism of chiral signal enhancement is analyzed based on the regulation of incident beam with orbital angular momentum (OAM) and particle’s characteristic parameters. The wave front of tightly focused linearly polarized light is regulated, the dichroism of OAM is measured by regulating the sign of OAM carried by the beam, and the relationship between the order of OAM and the intensity of the chiral signal is studied. When the order of the OAM carried by the beam is matched with the size of the sphere, the scattering circular dichroism signal can be enhanced by 22.8 times compared to that of circularly polarized light. The influence of particle size and chiral parameters on OAM dichroism signal is also analyzed.

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    Yang SUN, Haifeng HU. Enhancement mechanism of chiral signal from spheres based on OAM beams[J]. Optical Instruments, 2023, 45(3): 80

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    Paper Information

    Category: DESIGN AND RESEARCH

    Received: Nov. 21, 2022

    Accepted: --

    Published Online: Jul. 25, 2023

    The Author Email: HU Haifeng (hfhu@usst.edu.cn)

    DOI:10.3969/j.issn.1005-5630.2023.003.011

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