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Structural design method of conical ring array optical filter for realizing dual-band light splitting

A technology of structural design and optical filter, which is applied in the field of optics, can solve the problems of less absorption bands and low resonance intensity, and achieve the effects of excellent effect, increased resonance intensity, and improved reflectivity

Active Publication Date: 2021-08-27
东北大学秦皇岛分校
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  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to provide a method for designing a structure of a dual-band light-splitting tapered ring array filter. Aiming at the problems of low resonance intensity and few absorption bands of the existing circular ring structure, a filter based on a tapered ring array is designed. Nano-metal structures are used to enhance the surface plasmon resonance effect, which can finally realize the frequency selection of visible light and near-infrared light bands, thus providing a technical means for the preparation of optical filters

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  • Structural design method of conical ring array optical filter for realizing dual-band light splitting
  • Structural design method of conical ring array optical filter for realizing dual-band light splitting
  • Structural design method of conical ring array optical filter for realizing dual-band light splitting

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Embodiment

[0030] Such as Figure 1 to Figure 6 Shown, a kind of realization double-band spectroscopic tapered ring array filter structure design method of the present invention comprises the following steps:

[0031] S1 determines the filter structure: the filter structure is a double-layer structure, the bottom layer is a quartz substrate, the top layer is a 180nm thick gold film, and a tapered ring array is engraved inside the gold film;

[0032] The theoretical basis on which the S2 filter relies: When a beam of natural light shines on the metal structure, the light of a specific wavelength will interact with the gold film and generate surface plasmon polaritons (SPPs) on its surface. When the light wave (electromagnetic wave ) is incident on the interface between the metal and the dielectric, the free electrons on the metal surface collectively oscillate, and the electromagnetic wave is coupled with the free electrons on the metal surface to form a near-field electromagnetic wave th...

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Abstract

The invention relates to the field of optics, in particular to a structural design method of a conical ring array optical filter for realizing dual-band light splitting, and designs a nano-metal structure based on a conical ring array to enhance the surface plasma resonance effect in order to solve the problems of low resonance intensity and few absorption bands of an existing circular structure. And finally, frequency selection of visible light and near-infrared light bands can be realized, so that a technical means is provided for preparation of the light filter. The method comprises: S1, determining an optical filter structure; S2, a theoretical basis on which an optical filter depends; and S3, regulating and controlling parameters.

Description

technical field [0001] The invention relates to the field of optics, in particular to a method for designing a structure of a dual-band light-splitting tapered ring array filter. Background technique [0002] Surface plasmon filter is a kind of structural filter designed by using the collective oscillation of free charges caused by the interaction between metal and free electrons on the surface. It has a wide range of applications in the fields of sensors, liquid crystal displays and super-resolution imaging. application. At present, there are many limitations in the optical filters prepared by using organic dyes, such as easy to decompose under high temperature and ultraviolet radiation, organic dye molecules must be prepared in layers, and the process is complicated. However, the surface plasmon filter can easily change the filtered color only by modulating the parameters of its physical structure, and will not lose its frequency selection characteristics due to the influ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B5/00G02B27/00G02B5/20
CPCG02B5/008G02B27/0012G02B5/20G02B5/208G02B5/201
Inventor 吕江涛苏金鑫王禄丰孔鲁杨冀铭莫欣伟
Owner 东北大学秦皇岛分校
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