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Dielectric/metal composite structure supporting full-polarization coupling mode and application of dielectric/metal composite structure

A coupled-mode, full-polarization technology, applied in the field of sensing and color display, can solve the problems that hinder the application of nanophotonics and reduce the utilization efficiency of polarization polarization, and achieve simple test methods, bright luminous colors, and high test accuracy. Effect

Pending Publication Date: 2020-10-30
SOUTH CHINA NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This polarization limitation reduces the utilization efficiency of polarization and hinders the application of nanophotonics

Method used

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  • Dielectric/metal composite structure supporting full-polarization coupling mode and application of dielectric/metal composite structure
  • Dielectric/metal composite structure supporting full-polarization coupling mode and application of dielectric/metal composite structure
  • Dielectric/metal composite structure supporting full-polarization coupling mode and application of dielectric/metal composite structure

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Experimental program
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Effect test

Embodiment 1

[0031] see figure 1 , the present invention provides a sample supporting full polarization coupling mode, the sample adopts a glass substrate 1 coated with a metal film, and the material of the metal film is silver. The dielectric film is evenly attached to the surface of the silver film, and the material of the dielectric film is silicon nitride. The composition from bottom to top is glass substrate 1, metal film layer 2 (silver film), and dielectric film layer 3 (silicon nitride).

Embodiment 2

[0033] see figure 2 , the present invention provides a control device supporting full polarization coupling mode, including an input optical path, a receiving carrier and a detection mechanism 5 .

[0034] The input optical path includes a parallel white light source 4 with adjustable polarization state and incident angle. Plane wave light source is selected, with a wavelength range of 300nm-800nm. The polarization parameters and incident angle of the light source are adjusted, and incident on the containing carrier.

[0035] The holding carrier includes the sample and a prism 6, wherein the glass substrate 1 side of the sample is placed in the prism 6; the incident polarized light from the input light path is irradiated onto the glass substrate 1 of the sample.

[0036] The detection mechanism 5 uses a Frequency-domain field and power detector, which is placed on the reflection optical path to detect the reflection spectrum.

Embodiment 3

[0038] The present invention provides a control method that supports full polarization coupling mode, adopts the control device, and the control method includes:

[0039] By adjusting the polarization state of the light irradiated on the accommodating carrier to be TM light or TE light, the coupled Bosh-matched light enters the silver film, and further leaks to the silicon nitride, and the silicon nitride can be used as a waveguide.

[0040] The incident angle of the polarized light incident on the containing carrier is the critical angle of total internal reflection, so that an evanescent field is generated at the interface between the glass substrate and the silver film.

[0041] When the polarized light incident into the accommodation carrier is TM light, the surface plasmon wave generated on the surface of the silver film interacts with the silicon nitride waveguide to generate a surface plasmon waveguide mode; When the polarized light is TE light, a standing wave with an ...

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Abstract

The invention discloses a sample supporting a full-polarization coupling mode, a regulation and control device and a regulation and control method. The sample sequentially comprises a glass substrate,a metal film layer and a dielectric film layer from bottom to top. The regulation and control device comprises an input light path, an accommodating carrier and a detection mechanism, wherein the input light path comprises a linearly polarized parallel white light source with an adjustable polarization state and an adjustable incident angle, the accommodating carrier comprises a sample and a prism and one side of the glass substrate of the sample is positioned in the prism; polarized light incident from the input light path is irradiated to the metal film of the sample; the detection mechanism is placed on a reflection light path to detect a reflection spectrum. The resonance peaks of a surface polarization waveguide mode generated by TM light and a surface polarization-like surface waveguide mode generated by TE light are regulated and controlled by changing the refractive index, the thickness and the incident light angle of the dielectric film, and meanwhile, a high-order mode is supported. The limitation that only TM light can be applied to generate surface waves is broken through, the application of the TE light is expanded, full-polarization coupling is achieved, and the application efficiency of polarization is improved.

Description

technical field [0001] The invention relates to the technical fields of sensing and color display, in particular to a dielectric / metal composite structure supporting full polarization coupling mode and its application. Background technique [0002] Surface plasmons can confine and manipulate light at the sub-wavelength scale, and have a wide range of applications in the fields of biology, chemistry, sensing, and nanophotonic integration due to their excellent performance. Therefore, the acquisition of plasmonic waves is the basis. Since the momentum of the surface plasmons does not match the momentum of the incident photons, it is impossible to directly excite the metal surface with light to generate plasmon waves. Therefore, introducing a special structure to achieve Bosh matching is currently the most convenient and widespread method is prism coupling. The surface plasmon waves generated by this method must be excited by TM polarized light. Based on the current theory, TM ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N1/28G01N21/21G01D21/02G02B5/00G09F9/30
CPCG01N1/28G01N21/21G01D21/02G02B5/008G09F9/30
Inventor 兰胜李树磊
Owner SOUTH CHINA NORMAL UNIVERSITY
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