Lens for converting infrared ray into visible light wave band image and preparation method thereof

Abstract

The invention provides a lens for converting infrared rays into visible light wave band images and a preparation method thereof. The lens comprises a lens substrate, wherein a silicon dioxide thin film protection layer, a rare earth ion-doped up-conversion luminescence infrared imaging material film layer, a silicon dioxide thin film middle isolation layer, a two-dimensional square nano-silver metal crystal periodic array metasurface thin film layer and a silicon dioxide thin film bottoming layer are sequentially arranged on a surface of the lens substrate from top to bottom. According to the preparation method of the lens capable of converting the infrared ray into the visible light wave band image, in the process of producing and preparing a plated film, adjustment of an optical equivalent admittance value is introduced, and a strict coupling wave method is adopted; a zinc oxide thin film layer of an up-conversion infrared imaging mechanism and a two-dimensional square nano-silver metal crystal periodic array metasurface thin film layer with a multi-resonance coupling field enhanced luminescence effect are optimized, and the prepared thin film has advantages of being compact in film layer structure, resistant to corrosion, good in environmental stability and the like.

Description

technical field [0001] The invention belongs to the technical field of up-conversion luminescence mechanism combined with surface plasmon multi-resonance coupling field enhancement, and specifically relates to a lens for converting infrared rays into visible light band images and a preparation method thereof. Background technique [0002] For example, the anti-counterfeiting mark on RMB is a kind of up-conversion luminescent material, which emits visible images in the visible light band under the irradiation of infrared light in the anti-counterfeiting identification machine. At present, it has been widely used in currency, credit card, certificate, trademark, etc. Applications; Infrared imaging is a key technology in many applications, including night vision, autonomous vehicle navigation, optical tomography, and food quality control. There is a growing need to detect infrared (IR) light invisible to the human eye for a variety of applications ranging from food quality cont...

AI Technical Summary

Problems solved by technology

Commercial infrared cameras need to first convert infrared light into electrons and project the resulting image onto a display that blocks the transmission of visible light, thereby interfering with normal vision in the visible band

In addition, due to the low energy of infrared photons, such infrared detectors usually require supporting cryogenic cooling technology and related equipment, which greatly increases the overall weight and volume of the detector, making the infrared detector bulky

[0003] There is no spectacle lens on the international market that emits high-energy short-wave visible light band images based on the up-conversion luminescence mechanism of ion energy level transitions, so any spectacle lens on the market does not have the night vision function of infrared to visible images

In addition, commercial infrared imaging detectors must rely on the absorption of incident photons in narrow-bandgap semiconductors and the release of electrons detected by electrons, and due to the low energy of infrared photons, this infrared detection scheme even requires cryogenic cooling, which contains a lot of A complex electronic component device for photon-electron conversion, which appears to be bulky and bulky

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