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Chiral dependent surface plasmon polariton wavefront modulator under circular polarized light incidence

A technology of surface plasmons and circular polarization, which can be used in optics, instruments, electrical components, etc., and can solve problems such as not being modulated

Active Publication Date: 2019-09-24
FUDAN UNIV
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  • Abstract
  • Description
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Problems solved by technology

These two types of work solve the excitation problem of SPP, however, the wavefront of the excited SPP is similar to the wavefront of a plane wave, and has not been effectively modulated

Method used

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  • Chiral dependent surface plasmon polariton wavefront modulator under circular polarized light incidence
  • Chiral dependent surface plasmon polariton wavefront modulator under circular polarized light incidence
  • Chiral dependent surface plasmon polariton wavefront modulator under circular polarized light incidence

Examples

Experimental program
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Effect test

experiment example

[0058] Experimental example: SPP coupled wavefront and direction control effect chiral test

[0059] use Figure 14 The shown near-field SPP intensity detection experimental framework detects the near-field SPP intensity distribution in the left and right regions. The circularly polarized light emitted by the circularly deflected horn is vertically irradiated on the designed sample, and the probe is used to receive and detect the E z For distribution, the probe and the incident circular horn are connected by a network analyzer.

[0060] The experiment measures the near-field distribution of the central operating frequency of 12 GHz. The left-handed light (LCP) irradiates the excitation area, and the near-field scans the SPP intensity distribution on the left and right sides, as shown in Figure 15 As shown, the intensity of the left SPP is much greater than that of the right SPP, which means that the main energy is coupled to the left, and the wavefront of the SPP is modulate...

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Abstract

The invention belongs to the technical field of electromagnetic specific medium metasurfaces, and particularly relates to a chiral dependent surface plasmon polariton wavefront modulator under circular polarized light incidence. A coupling regulator is composed of an excitation region and two intrinsic regions which are spliced at the left side and the right side of the excitation region and are of the same structure. For circular polarized light, the modulator can achieve the regulation and control on SPP wavefront chirality dependence while achieving the SPP high-efficiency coupling; for a condition that the circular polarized light is in a left-handed rotation state, the modulator achieves the point focusing regulation and control on the SPP wave surface; for a condition that the circular polarized light is in a right-handed rotation state, the modulator achieves the beam deflection regulation and control on the SPP wave surface; wherein a primitive cell is of a metal microstructure / dielectric medium / metal substrate sandwich structure, and the intrinsic region is of a dielectric medium / metal substrate structure. The modulator provided by the invention has the advantages of simple structure, function integration, ultra-high efficiency, independent and adjustable wavefront and the like, and has huge application potential for near-field regulation based on a chip.

Description

technical field [0001] The invention belongs to the technical field of meta-materials (Meta-materials) metasurfaces, and specifically relates to a chirality-dependent surface plasmon wavefront modulator under circularly polarized light incidence. Background technique [0002] Common materials in nature, such as the refractive index of glass to light is 1.45, and the dielectric parameter of metal to light is generally negative, these phenomena originate from the fact that natural materials are composed of molecules or atoms, and the response of molecules and atoms to external electromagnetic waves determines The electromagnetic properties of this material. The idea of ​​electromagnetic metamedia is to carefully design some artificial "molecules and atoms" (Meta-atom), usually called metamedia units, and combine them into (two-dimensional or three-dimensional) arrays in a certain arrangement to construct Specific electromagnetic parameters that do not exist in nature can obta...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02F1/01H01Q15/00
CPCG02F1/0102G02F1/0136H01Q15/0086
Inventor 孙树林李小二王卓董少华易思雄段静文管福鑫陈宜臻何琼周磊
Owner FUDAN UNIV
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