Random laser manufacturing method based on coupling of silver nanorod metamaterial and luminous body

Abstract

The invention discloses a random laser manufacturing method based on coupling of a silver nanorod metamaterial and a luminous body. According to the random laser, an aluminum sheet is used as a substrate, a silver nanorod metamaterial structure is used as a surface plasmon resonant cavity, Nile red fluorescent dye and a polymethyl methacrylate (PMMA) active layer are used as an optical gain dielectric layer, and then a slide is covered to prevent oxidation of the dye. The excitation surface plasmon nanometer resonant cavity mode is adjusted by changing the length of the silver nanorods, and then the random laser emission wavelength can be adjusted and controlled by means of selective enhancement of the longitudinal high-order nanometer resonant cavity mode. The random laser has the characteristics of being low in threshold value and high in output power, the emission wavelength of the random laser can be effectively regulated and controlled within a wide wavelength range, the researchfield and research direction of the random laser are enriched, and the random laser can be applied to sensing, photonic crystals and the like.

Description

technical field [0001] The invention relates to the field of noble metal nanometer metamaterials and random lasers, in particular to a surface plasmon random laser with adjustable emission wavelength based on the coupling of silver nanorod metamaterials and fluorescent molecules. Background technique [0002] Unlike traditional lasers, random lasers do not require a resonant cavity composed of mirrors to capture photons to achieve lasing. It is generated by random scattered light in a disordered gain medium. In 1968, Letokhov et al. first calculated the optical properties of random gain media that amplify and scatter light. In 1996, Cao et al. observed the phenomenon of stimulated emission in ZnO semiconductor random media, and explained the radiation spectrum and spatial distribution characteristics of random lasers well with the photon localization theory. In recent years, due to the special properties of relatively simple technical requirements (no optical cavity), small...

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Problems solved by technology

In 2011, Zhai Tianrui of Beijing University of Technology and others studied a waveguide-plasmon random laser lasing scheme, which is to coat a layer of dye-doped polymer on the substrate of randomly distributed gold nano-island structure , by changing the average diameter of the gold nano-islands to change the plasmon resonance peak, the laser wavelength control is realized, and the control range reaches 17nm, but there are still deficiencies in the characteristics of the laser threshold and control efficiency.

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