| In recent years,quantum dots have attracted much attention as a new kind of nano-dimension semiconductor material.Because quantum dots have unique physical and optical properties,their applications are becoming more and more extensive.The luminescent properties,nonlinear optical effects and thermo-optical effects of PbSe quantum dots have been studied.In this thesis the thermo-optical effect of PbSe quantum dots,and the application of PbSe quantum dots used in the sensing field are studied.The thermal materials were widely used in the sensing applications,such as temperature sensor with high thermal coefficient material.Therefore,the study on the thermo-optic effect and sensing applications of PbSe quantum dots is of great significance.In this thesis,the thermo-optical effect of PbSe quantum dots is studied.PbSe colloidal quantum dots doped fiber was prepared.All-optical Mach-Zehnder(M-Z)interferometer was experimental realized.In the setup the quantum-dots-doped fiber was used as thesensing arm of the interferometer.Experimental movement of the interference fringes when the sensing arm at different irradiation conditions of light intensity.The experiments were carried out using semiconductor lasers with wavelengths of 473 nm,632nm,808 nm and980nm.The sensor was tested under different temperature.And the movement law of interference fringes under different wavelengths of light source was analyzed,and the law of interference fringes’ movement under different temperature condition was analyzed.From the experimental results,it was found that the movement of the interference fringes is related not only to the intensity of the light,but also to the wavelength of the light source irradiated on the sensing arm.The sensor has a higher sensitivity to temperature.In this thesis,the application of quantum dot material in light intensity sensing and temperature sensing is demonstrated,which achieved a wider application of quantum dot material,and it lays the foundation for the application of quantum material as thermo-optical materials. |
