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A Method for Generating Superchiral Light Fields Using Helical Radially Polarized Beams

A light beam and chirality technology, applied in the field of optics, can solve the problem that chiral molecules cannot be fixed in the superchiral light field, and achieve the effect of realizing super-resolution optical imaging, highlighting substantive features, and being widely used.

Active Publication Date: 2021-11-02
UNIV OF SHANGHAI FOR SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] In view of the above-mentioned problems and demands existing in the prior art, the object of the present invention is to provide a method for generating a superchiral light field using a helical radially polarized beam, through the acquisition of the helical radially polarized beam and the focusing of the helical radially polarized beam Generate a superchiral optical field with high chiral enhancement factor, high resolution and adjustable spatial position to solve the problem that chiral molecules cannot be fixed in the superchiral optical field region

Method used

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  • A Method for Generating Superchiral Light Fields Using Helical Radially Polarized Beams
  • A Method for Generating Superchiral Light Fields Using Helical Radially Polarized Beams
  • A Method for Generating Superchiral Light Fields Using Helical Radially Polarized Beams

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Embodiment 1

[0037] Combining Figure 1 to image 3 As shown, the present embodiment provides a method for generating a superchiral light field by using a spiral radially polarized beam, using a radially polarized beam 1 as an incident beam, which is converted into a spiral radially polarized beam 3 after passing through a spiral phase plate 2, Wherein the topological charge of the spiral phase plate 2 is +1 or -1. In this embodiment, the incident beam specifically adopts a Bessel-Gauss type radially polarized beam 1, the wavelength of the incident light is λ=1 micron, and the electric field component of the incident beam is expressed as:

[0038] E. inc =L(r)e r ,

[0039] The incident beam has central symmetry, and the beam intensity distribution is:

[0040]

[0041] Among them, r is the radial coordinate in the polar coordinate system, w 0 is the girdle diameter, J 1 (x) is a Bessel function of order 1;

[0042] It should be noted that the helical radially polarized beam 3 can...

Embodiment 2

[0053] combine Figure 4 As shown, this embodiment utilizes the super-chiral light field generated in embodiment 1 to have super-resolution optical imaging, and this embodiment uses the super-chiral light field to perform two-dimensional scanning imaging of a single chiral molecule. The chiral molecules to be measured are located on the z=0 plane and the surface of the optical glass 8 . A two-dimensional nano-shift platform is used to move the relative spatial position between the chiral molecule and the superchiral light field in the xy plane, and the circular partial dichroic signal of the chiral molecule is recorded at different spatial positions.

[0054] The method for measuring the circular dichroic signal: under the condition that the chirality of the superchiral light field is positive, measure the absorption of the chiral molecule as A1, and under the condition that the chirality of the superchiral light field is negative, measure the chirality The absorption of sexu...

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Abstract

The invention discloses a method for generating a superchiral light field by using a helical radially polarized light beam. The superchiral light field is formed by obtaining a helical radially polarized light beam and focusing the helical radially polarized light beam in any The vibration direction of the electric field component at one point is along the radial direction, and the wavefront is a spiral structure; the chiral enhancement factor of the superchiral light field is greater than 1, and has the characteristics of a Bessel non-diffracting beam and super-resolution Optical imaging; the superchiral light field produced by the present invention significantly enhances the circular partial dichroism signal, and the signal intensity is high; the light field area is a needle-shaped area located in the central area, and its long axis direction is parallel to the beam propagation direction, which is beneficial to Two-dimensional scanning imaging, whose diameter is on the order of sub-wavelength, has super-resolution optical imaging while identifying molecular chirality; the incident circularly polarized beam passes through the radial polarizer to generate a spiral radially polarized beam, which is different from the traditional circularly polarized beam. The dichroism measurement device is compatible, which is beneficial to popularization and application.

Description

technical field [0001] The invention relates to a method for generating a superchiral light field, in particular to a method for generating a superchiral light field by using a helical radially polarized light beam, and belongs to the field of optical technology. Background technique [0002] The light field is a four-dimensional concept of light propagating in space. The light field is a parameterized representation of a four-dimensional light radiation field that contains both position and direction information in space, and is the totality of all light light radiation functions in space. The real information of the entire space environment can be obtained at any angle and position in the space, and the image information obtained by using the light field is more comprehensive and of better quality. [0003] Chiral molecules refer to a class of molecules in which the molecule itself and the mirror image of the molecule cannot overlap each other. In the field of biochemistry...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02F1/01G02B27/58
CPCG02B27/58G02F1/0136
Inventor 詹其文胡海峰甘巧强
Owner UNIV OF SHANGHAI FOR SCI & TECH
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