CN-121995659-A - Broadband optical Stark seed generator

Abstract

The invention provides a broadband optical Stokes son generator, which belongs to the technical field of optical field regulation and control, and comprises a spin orbit coupling functional unit, a focusing effect functional unit and a focusing effect functional unit, wherein the spin orbit coupling functional unit is provided with optical anisotropy distributed in a rotation symmetry mode and is used for modulating the polarization state of incident light so as to generate an optical field covering all polarization states of a Poincare sphere, the focusing effect functional unit is provided with lens type transmission phase distribution and is used for carrying out space reconstruction on the polarization state of the modulated optical field, and under the combined action of the spin orbit coupling functional unit and the focusing effect functional unit, the optical Stokes vector distribution of the focusing optical field on a focal section forms an optical Stokes son topological structure. The invention realizes the optical Sjog seed generator with large available bandwidth, and is beneficial to promoting the application of the optical Sjog seed in the field of information transmission.

Inventors

• SUN JINGBO
• LIU YUANFENG
• SHEN YIJIE
• ZHOU JI

Assignees

• 清华大学

Dates

Publication Date

20260508

Application Date

20260228

Claims (10)

1. 1. A broadband optical sigma-type generator, comprising: a spin orbit coupling function unit having optical anisotropy distributed rotationally symmetrically for modulating the polarization state of incident light to generate a light field covering all polarization states of the poincare sphere; The focusing effect functional unit is provided with lens type transmission phase distribution and is used for carrying out space reconstruction on the polarization state of the modulated light field; Under the combined action of the spin orbit coupling functional unit and the focusing effect functional unit, the optical Stokes vector distribution of the focusing light field on the focal section forms an optical Stokes sub-topological structure.
2. 2. The broadband light-singe seed generator of claim 1, wherein an orientation angle θ of an optically anisotropic principal axis of the spin-orbit coupling function unit and an attitude angle of an optically anisotropic principal axis of the spin-orbit coupling function unit The method meets the following conditions: θ= + 0 ; Wherein, the 0 Is a fixed offset angle.
3. 3. The broadband light-singe seed generator of claim 2, wherein the optically anisotropic principal axes of the spin-orbit coupling functional units are arranged in a tangential, radial or twisted arrangement.
4. 4. The broadband light-singe-phase generator according to claim 1, wherein a center thickness d of the spin orbit coupling functional unit along a light propagation direction satisfies a non-half-wave condition and a non-full-wave condition: 2(n e -n o )d/λ≠m; Wherein λ is a central working wavelength, m is an arbitrary integer, n e and n o are refractive indices of an optically anisotropic material constituting the spin orbit coupling functional unit in two orthogonal principal axis directions, and n e ≠n o , respectively.
5. 5. The broadband light-stigmine generator according to claim 1, wherein the spin-orbit coupling function unit is constituted by a medium having a birefringent property, the optical axis direction of which continuously varies with the attitude in a plane perpendicular to the light propagation direction.
6. 6. The broadband light-stigmine generator according to claim 5, wherein the medium is a solid-state crystal, a liquid crystal functional device or a sub-wavelength structured supersurface.
7. 7. The broadband light-stigmine generator according to claim 1, wherein the focusing effect functional unit is a transmissive optical focusing structure comprising a plano-convex lens, a biconvex lens, a conical lens, a spherical lens, an aspherical lens or a fresnel lens.
8. 8. The broadband light singe phase generator of claim 1, wherein the spin orbit coupling function and the focusing effect function are integrated in a single optical element.
9. 9. The broadband light stigmine generator according to any one of claims 1 to 8, wherein the incident light is circularly polarized light, elliptically polarized light or linearly polarized light, wherein the focused light field forms stokes-style semen when the incident light is circularly polarized light, wherein the focused light field forms four halves when the incident light is linearly polarized light, and wherein the focused light field forms double stokes-style semen when the incident light is elliptically polarized light.
10. 10. The broadband light sping generator of any one of claims 1-8, wherein the spin orbit coupling functional unit and the focusing effect functional unit are provided in plurality and arranged on a substrate to form an array of optical functional structures.

Description

Broadband optical Stark seed generator Technical Field The invention relates to the technical field of light field regulation, in particular to a broadband optical space seed generator. Background The cassia seed is a topological state widely existing in various condensed state physical systems and physical fields. For example, a morphologically rich spinodal core can be produced in ferroelectric, ferromagnetic materials. By utilizing the topological protection characteristic of the cassia seed and the characteristic of rich variety of the topological state of the cassia seed, the cassia seed is hopeful to be used in the field of information storage and transmission so as to realize high-density information storage and robust information transmission. Although the field of ferroelectric, ferromagnetic materials has been much advanced by the use of the spinodal materials, it is difficult to use the spinodal materials in long distance information transmission by being localized in specific spatial locations of the materials. The optical field is used as electromagnetic wave, has the advantages of multiple physical degrees of freedom, high transmission speed and the like, and is an ideal high-speed and high-capacity information transmission carrier. Therefore, constructing the optical sterculia seeds and realizing the robust transmission of the optical sterculia seeds in the free space are important paths for promoting the application of the sterculia seeds in the field of information transmission. Currently, the scheme for producing optical sterculia seeds has a specific working bandwidth of optical components used in series in an optical path, so that the production of the optical sterculia seeds is limited by a narrow available bandwidth, and an effective scheme for producing broadband optical sterculia seeds is lacking. Disclosure of Invention The invention provides a broadband optical space seed generator, which realizes the optical space seed generator with large available bandwidth and is beneficial to pushing the application of the optical space seed in the field of information transmission. In a first aspect, the present invention provides a broadband optical stigmine generator comprising: a spin orbit coupling function unit having optical anisotropy distributed rotationally symmetrically for modulating the polarization state of incident light to generate a light field covering all polarization states of the poincare sphere; The focusing effect functional unit is provided with lens type transmission phase distribution and is used for carrying out space reconstruction on the polarization state of the modulated light field; Under the combined action of the spin orbit coupling functional unit and the focusing effect functional unit, the optical Stokes vector distribution of the focusing light field on the focal section forms an optical Stokes sub-topological structure. According to the broadband optical Stark seed generator provided by the invention, the orientation angle theta of the optical anisotropy main axis of the spin orbit coupling functional unit and the attitude angle of the optical anisotropy main axis of the spin orbit coupling functional unitThe method meets the following conditions: θ=+0; Wherein, the 0 Is a fixed offset angle. According to the broadband optical Stokes son generator provided by the invention, the optical anisotropy main axes of the spin orbit coupling functional units are arranged in a tangential direction, a radial direction or a torsion type. According to the broadband optical Stokes son generator provided by the invention, the center thickness d of the spin orbit coupling functional unit along the light propagation direction meets the following non-half-wave condition and non-full-wave condition: 2(ne-no)d/λ≠m; Wherein λ is a central working wavelength, m is an arbitrary integer, n e and n o are refractive indices of an optically anisotropic material constituting the spin orbit coupling functional unit in two orthogonal principal axis directions, and n e≠no, respectively. According to the broadband optical Stark seed generator provided by the invention, the spin orbit coupling functional unit is composed of a medium with birefringence characteristics, and the optical axis direction of the medium continuously changes along with the attitude angle in a plane perpendicular to the light propagation direction. According to the broadband optical Sjog seed generator provided by the invention, the medium is a solid crystal, a liquid crystal functional device or a sub-wavelength structure super surface. According to the broadband light-stigman generator provided by the invention, the focusing effect functional unit is a transmission type optical focusing structure and comprises a plano-convex lens, a biconvex lens, a conical lens, a spherical lens, an aspherical lens or a Fresnel lens. According to the broadband optical sigma-delta generator provided by the invention, the spin o