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Method for generating arbitrary orientation energy flow in sub-wavelength spatial scale

A technology of spatial scale and method of production, applied in optical components, optics, instruments, etc.

Active Publication Date: 2022-03-01
JINAN UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, it is still unknown whether the separation of the electric field and the magnetic field, that is, the decoupling of E and H can be achieved by using the 4π focusing method.

Method used

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  • Method for generating arbitrary orientation energy flow in sub-wavelength spatial scale
  • Method for generating arbitrary orientation energy flow in sub-wavelength spatial scale
  • Method for generating arbitrary orientation energy flow in sub-wavelength spatial scale

Examples

Experimental program
Comparison scheme
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Embodiment

[0066] Such as Figure 1 to Figure 3 As shown, a method for generating energy flow in any orientation within a sub-wavelength space scale includes a 4π focusing system and an incident light field. The 4π focusing system is composed of two identical high numerical aperture focusing lenses; the incident light field includes Three sets of incident light propagating in opposite directions;

[0067] Focus the three groups of incident light propagating in opposite directions at the focal point of the 4π focusing system, and adjust the spatial position of the two focusing lenses so that the focal points of the two lenses coincide with each other;

[0068] The first group of counter-propagating incident light is linearly polarized light with the same polarization orientation (the polarization orientation of the light field generally refers to the polarization orientation of the electric field) and a phase difference of π;

[0069] The second group of counter-propagating inci...

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Abstract

The invention discloses a method for generating an arbitrarily oriented energy flow in a sub-wavelength spatial scale, which realizes decoupling of an electric field and a magnetic field in a focusing space by adjusting polarization states and phase distribution of three groups of incident light propagating in opposite directions under a 4 pi focusing condition, namely, realizes independent regulation and control of the electric field and the magnetic field. By adjusting amplitude weight factors of three groups of incident light, spatial three-dimensional arbitrary adjustability of optical field energy flow orientation is realized, finally, by controlling the numerical aperture of a 4pi focusing lens, the orientation purity of energy flow spatial orientation is effectively improved, and spatial distribution of energy flow is compressed to a sub-wavelength spatial scale, so that the optical field energy flow orientation accuracy is improved. Therefore, powerful technical support is provided for the field of small-space-scale light scattering and light force application.

Description

technical field [0001] The invention belongs to the technical field of light field energy flow regulation, and in particular relates to a method for generating energy flow of arbitrary orientation within a sub-wavelength space scale based on a 4π focusing system. Background technique [0002] As a characteristic attribute of light, energy flow reveals the propagation characteristics of light energy. It can be represented by the Poynting vector (S) perpendicular to the electric field (E) and magnetic field (H). In addition to the fundamental physical significance, energy flow also plays a pivotal role in the application of light scattering and optomechanics. For example, energy flow can be used to manipulate the motion of absorbing particles. In the optical tweezers system, the trajectory of the absorbing particles is consistent with the direction of the energy flow, and the velocity of the particles is proportional to the magnitude of the energy flow. Therefore, at the sm...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B27/28G02B27/09
CPCG02B27/286G02B27/0927
Inventor 王思聪曹宏堃李向平
Owner JINAN UNIVERSITY