GQDs-FBG光譜特性研究
[Abstract]:In recent years, researchers have made use of various coating techniques to combine films formed from different materials with fiber gratings. A uniform symmetrical or periodically varying asymmetric film is coated on the cladding of the fiber grating to change the transmission characteristics of the fiber grating in order to fabricate a new type of fiber optic sensor. Different types of sensors with high sensitivity and good stability have been fabricated by coating dielectric film metal film and nanomaterial film on fiber Bragg gratings in different situations. They are widely used in the field of optical fiber communication and sensing. It has become a research focus at present to coating nano-material film on fiber gratings. Graphene quantum dot (GQDs) is a quasi zero dimensional carbon nanomaterial formed when graphene size is small 10nm. It not only has the fastest conductive speed of graphene, but also has large specific surface area and the strongest thermal conductivity. The maximum mechanical strength also has the advantages of high absorptivity and luminescence efficiency, unique and tunable optical properties, low toxicity, safety and environmental protection of quantum dots. Although there have been a lot of studies on fiber gratings coated with graphene and carbon nanotubes, there are no reports on the study of fiber gratings coated with graphene quantum dots. Because graphene quantum dots (GQDs) have unique optical and physical properties compared with graphene and carbon nanotubes, the spectrum of graphene quantum dots coated on fiber gratings will exhibit special changes. In this paper, the spectrum of graphene quantum dots (GQDs) coated with fiber grating is studied by combining theory and experiment. The main research contents are as follows: in chapter 1, the principle of coated fiber grating and the research status at home and abroad are summarized. At the same time, the related knowledge of fiber grating and graphene quantum dot (GQDs) is introduced. In the second chapter, from the fiber theory to the fiber grating theory and sensing theory, the grating parameters are studied and analyzed in detail and verified by MATLAB software. In chapter 3, the principle of coated fiber gratings is described in detail, and the photoelectric and adsorption properties of graphene quantum dots (GQDs) are studied. The model of cladding anisotropic crystal fiber grating and the cladding corrosion type fiber grating are analyzed, and the simulation results are analyzed by MATLAB Optigrting and Rsoft optical software. In chapter 4, the etching coated fiber gratings are obtained in the experimental preparation stage, and the coating solution of graphene quantum dots (GQDs) is prepared at the same time. Finally, the spectrum of graphene quantum dots (GQDs) coated with fiber gratings is studied. It is found that the reflection becomes smaller and higher, and the center wavelength is always redshift. A humidity sensor based on GQDs-FBG is proposed. This is a preliminary exploration for the fabrication of new fiber Bragg grating sensors.
【學(xué)位授予單位】:廣西師范大學(xué)
【學(xué)位級(jí)別】:碩士
【學(xué)位授予年份】:2017
【分類號(hào)】:TN25
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