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Method for generating sub-wavelength space-time vortex under strong focusing condition

A sub-wavelength, strong focusing technology, applied in the field of micro-nano optics, can solve the problems of space-time helical phase destruction, etc., and achieve the effect of strong performance and strong scalability

Active Publication Date: 2020-09-29
UNIV OF SHANGHAI FOR SCI & TECH
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Problems solved by technology

[0005] The purpose of the present invention is to provide a method for generating sub-wavelength space-time vortices under strong focusing conditions, which is used to solve the problem that the space-time spiral phase is destroyed after the space-time vortex in free space is focused by a high numerical aperture lens

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  • Method for generating sub-wavelength space-time vortex under strong focusing condition
  • Method for generating sub-wavelength space-time vortex under strong focusing condition
  • Method for generating sub-wavelength space-time vortex under strong focusing condition

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[0051] like figure 1 As shown, after the custom-made incident space-time wave packet is focused by a lens with high numerical aperture, a space-time vortex light field on the sub-wavelength scale with expected topological charges can be obtained on the focal plane of the lens. The intensity and phase distribution of the focused space-time vortex in the space-time domain can be calculated by Debye integral. Here, the specific implementation of the technical solution is described by taking the generation of a focused space-time vortex with a topological charge of +1 as an example, including the following steps:

[0052] Step 1: For the focal-field space-time vortex with topological charge +1, its Laguerre-Gaussian modulus can be determined as

[0053] Step 2: Use formula (1) to decompose the Laguerre-Gaussian mode of the focal field of the space-time vortex, and obtain the Hermitian-Gaussian mode of the same order as According to formula (3) and formula (4), we can get Th...

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Abstract

The invention discloses a method for generating a sub-wavelength space-time vortex under a strong focusing condition. According to the method, an incident space-time wave packet is customized according to the topological charge of a focal field in a time-space domain, and after the customized wave packet is focused by a lens with a high numerical aperture, a space-time vortex light field with predetermined transverse orbital angular momentum in a sub-wavelength scale can be generated on a focal plane. The method for generating the sub-wavelength space-time vortex under the strong focusing condition is used for solving the problem that the space-time spiral phase is damaged after the space-time vortex in the free space is focused by the high numerical aperture lens.

Description

technical field [0001] The invention relates to the field of micro-nano optics technology, in particular to a method for generating sub-wavelength space-time vortices under strong focusing conditions. Background technique [0002] As one of the intrinsic properties of photons, photon angular momentum is an important research direction of nanophotonics, which can be widely used in large-capacity ultra-high-speed optical communication, quantum information processing, optical tweezers, super-resolution microscopic imaging, spin-orbit coupling, etc. , and its interaction with micro-nano structures is likely to bring milestone development to these fields. There are two types of angular momentum of photons: spin angular momentum and orbital angular momentum. The rotation of the vibration direction of the electric field or magnetic field generates photon spin angular momentum, which is determined by the polarization helicity of the photon. Usually, the spin axis direction of the s...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B27/00
CPCG02B27/0012
Inventor 陈建詹其文郑震洧万辰皓
Owner UNIV OF SHANGHAI FOR SCI & TECH
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