Method for regulating and controlling orientation of focal field space-time wave packet orbital angular momentum rotation axis

A technology of orbital angular momentum and wave packet orbit, applied in optics, radiation/particle processing, instruments, etc., to achieve a wide range of effects

Inactive Publication Date: 2021-12-07
UNIV OF SHANGHAI FOR SCI & TECH
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AI Technical Summary

Problems solved by technology

Due to the lack of understanding of transverse orbital angular momentum for a long time, the spin-orbit interaction related to it has not been explored

Method used

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  • Method for regulating and controlling orientation of focal field space-time wave packet orbital angular momentum rotation axis
  • Method for regulating and controlling orientation of focal field space-time wave packet orbital angular momentum rotation axis
  • Method for regulating and controlling orientation of focal field space-time wave packet orbital angular momentum rotation axis

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specific Embodiment approach

[0058] Such as figure 1 As shown, the preprocessed circularly polarized incident wave packet is focused by a high numerical aperture objective lens to form a circularly polarized spatiotemporal light vortex at the focal plane of the lens, which carries the expected topological charge of the transverse orbital angular momentum. Taking the generation of a focused circularly polarized space-time optical vortex with a transverse orbital angular momentum topological charge as +1 as an example to illustrate the specific implementation of the technical solution, the following steps are included:

[0059] Step 1: According to formula (1-4), for the transverse orbital angular momentum whose direction is along the y-axis and whose topological charge is +1, the Laguerre-Gaussian mode corresponding to the circularly polarized space-time light vortex can be expressed as: The Laguerre-Gaussian module with a topological charge of -1 is:

[0060] Step 2: As shown in formula (7), linearly ...

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Abstract

The invention discloses a method for regulating and controlling the orientation of a focal field space-time wave packet orbital angular momentum rotation axis. The method comprises steps of carrying out targeted preprocessing operation of a circular polarization incident wave packet according to an expected topological charge number; taking the preprocessed circular polarization space-time wave packet as an incident field of a strong focusing system, and obtaining a vector space-time optical vortex on a focal plane through focusing of a high numerical aperture objective lens; after the spin angular momentum of the circularly polarized incident wave packet is focused by a lens, longitudinal orbital angular momentum with the topological charge number of + 1 or -1 being induced, and the longitudinal orbital angular momentum being mutually coupled with transverse orbital angular momentum in focal field space-time optical vortex; for transverse polarization components (namely x and y components) of focusing vector space-time optical vortex, the cross sectional area of a space-time plane in a wave packet can be changed by controlling the pulse width, and then the density ratio of longitudinal and transverse orbital angular momentum is changed, so the orientation of a total orbital angular momentum rotation axis in the transverse polarization components is controlled. According to the invention, the orientation of an orbital angular momentum rotation axis of a transverse polarization component is regulated and controlled, and a longitudinal polarization component with a complex vortex structure is generated.

Description

technical field [0001] The invention relates to the technical field of micro-nano optics, interaction between light and matter, and in particular to a method for regulating the orientation of the orbital angular momentum rotation axis of a focal field space-time wave packet. Background technique [0002] Photons can carry linear momentum along the optical axis, spin angular momentum related to the circular polarization state, and orbital angular momentum related to vortex light. As an intrinsic property of photons newly discovered in recent decades, orbital angular momentum has been extensively studied and widely used in optical communication, optical tweezers, super-resolution and other fields. In general, spin angular momentum and orbital angular momentum are regarded as two independent rotational degrees of freedom of photons, and they do not affect each other in a homogeneous isotropic medium under paraxial conditions. However, under some specific conditions, the spin a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02F1/01G21K1/00
CPCG02F1/0136G21K1/00
Inventor 陈建詹其文于立华
Owner UNIV OF SHANGHAI FOR SCI & TECH
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