The Research Of Polymer Waveguide Ultraviolet Sensors Based On Mach-Zehnder Interferometer

The continuous development of new technologies,such as the internet of things,big data,cloud computing and so on,has brought more efficient and convenient life to today's high-speed information age,but also put forward more requirements for the perception of information needs.As the sensing layer in the internet of things system,the development of sensors greatly meets the needs of human in scientific research,environmental monitoring,medical care,Transportation,military and other aspects.The sensing of ultraviolet light has a wide demand for people in the field of life and research and also has important research significance.At present,the sensor of ultraviolet light is mainly based on various optical detector made by inorganic light-sensitive materials.However,the optical sensor of polymer waveguide structure has the advantage of simple processing technology,low price and easy integration.So,an optical waveguide sensor based on organic light-sensitive materials is proposed in this paper.Main research content is as follows:(1)Firstly,the current research status of polymer waveguide sensor is introduced,the advantages and disadvantages of different polymer waveguide sensors are analyzed.On this basis,the Mach-Zehnder Interferometer is proposed as the sensor structure to be developed.The research object and significance of this thesis are introduced.(2)For the selected optical waveguide materials,the dispersion equation of rectangular waveguide is used to analyze the condition range of single mode transmission of rectangular waveguide,and to be verified by COMSOL software.(3)For the design and simulation of the device,the structure of Two-mode Interfermeter(TMI)is used to distribute the light power of two arms,thus avoid the problem that the optical field interference effect is not obvious when the light power in the two arms has large difference.(4)A low refractive index silicon dioxide material(n = 1.4444)is used as a lower cladding layer,a commercial polymer Epo Core material(n = 1.5730)is use as a waveguide core layer,an upper cladding reference arm is used as an Epo Clad(n = 1.5595)material,the sensing arm material is an organic material prepared in the laboratory and has dynamic response to ultraviolet light,a polymer waveguide sensor with dynamic response to ultraviolet light is prepared through a simple process of two-step exposure development,and ultraviolet light source(lambda = 365 nm)is used to test the sensor,the wavelength drift of MZI interference spectrum under the condition of different power of ultraviolet light is researched.According to the experimental data,the sensitivity of the device is0.0423 nm/(min ? ?w/cm2).In this thesis,a novel optical polymer waveguide sensor with novel sensitive materials which can detect ultraviolet light intensity is prepared by simple exposure and development.It has important potential application value in the optical sensing field of the internet of things.