A UV detector based on zno nanorod-micro-nano fiber hybrid waveguide

Abstract

The invention discloses an ultraviolet detector based on a ZnO nanorod / micro-nano fiber hybrid waveguide. The ultraviolet detector includes sequentially connected light source, input single-mode fiber, ZnO nanorod / micro-nano fiber hybrid waveguide, output single-mode fiber, spectrometer; the ZnO nanorod / micro-nano fiber hybrid waveguide is prepared by fusion tapered method The micro-nano optical fiber is further realized by growing zinc oxide nanorods in the prepared micro-nano optical fiber cone region by hydrothermal method; when the ZnO nanorod / micro-nano optical fiber hybrid waveguide is irradiated by ultraviolet light, the refractive index of the zinc oxide nano-rods changes , and then the evanescent field in the taper region of the micro-nano fiber changes accordingly, thereby changing the output light intensity of the ZnO nanorod / micro-nano fiber hybrid waveguide. The invention also discloses a corresponding manufacturing method of the ultraviolet detector based on the ZnO nanorod / micro-nano fiber hybrid waveguide. The invention realizes all-fiber ultraviolet detection based on the evanescent field principle, and has high sensitivity, compact and simple structure, and strong anti-electromagnetic interference capability.

Description

technical field [0001] The invention belongs to the technical field of optical fiber sensors, and more specifically relates to an ultraviolet detector based on a ZnO nanorod-micro-nano optical fiber hybrid waveguide. Background technique [0002] Ritte, a German physicist, found that the ultraviolet region is the electromagnetic wave band of 200nm-400nm. Usually, the ultraviolet spectral region is divided into three regions: a region (320nm-400nm), where the absorption of radiation in the atmosphere is the smallest. It is beneficial, but the ultraviolet radiation of 320nm-345nm can damage the eyes and produce pigmentation of the skin; the radiation in the b area (270nm-320nm, reaching the low-energy boundary of the X-ray spectrum) is the most harmful to humans. The absorption of protein and deoxyribonucleic acid (DNA) is located in this spectral region. Radiation in this range can produce biological mutations and skin cancer; radiation in region c (200nm-270nm) will be compl...

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Problems solved by technology

[0004] Aiming at the defects and improvement needs of the prior art, an implementation example of the present invention provides an ultraviolet detector based on a ZnO nanorod-micro-nano fiber hybrid waveguide, the purpose of which is to combine nano-ZnO material with micro-nano fiber sensing, The characteristics of ZnO refractive index can be changed by photogenerated carriers, and all-fiber ultraviolet detection is realized based on the evanescent field principle, which does not require electrical equipment, avoids the measurement of photocurrent, and solves the problem of low reliability of existing ultraviolet detectors, harsh preparation conditions, Problems of high production cost and technical difficulty

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