Analysis Of Hybrid Plasmonic Waveguide Characteristics And Design Of Bragg Grating Photonic Devices

Hybrid plasmonic waveguides are widely concerned in the field of nano-optics due to their advantages of high integration and strong field localization.Researchers are committed to studying hybrid plasmonic waveguides in different morphologies in order to improve integration and field locality while pursuing longer transmission distances.Integrated photonic devices based on hybrid plasmonic waveguides,such as polarizer couplers and beam splitters,have been widely used.In this thesis,the mode-limiting ability and propagation length of two different types of hybrid plasmonic waveguides are studied.Then the transmission spectrum of Bragg grating structures based on the hybrid plasmonic waveguides and the chirped structure are analysed.Finally,an element structure with dual-mode adjustable band gap,single-mode wide adjustable band gap are designed.The main research contents of this paper are as follows: Firstly,according to the dispersion relationship and transmission characteristics of the ridge hybrid plasmonic waveguide,the transmission characteristics of TE and TM modes of the hybrid plasmonic waveguide Bragg grating structure are studied.Then optimizing the transmission spectrum at specified wavelength bands through the admittance matching theory and achieve a good filtering function.Secondly,the slab hybrid plasmonic waveguide is studied,which maintains the great mode limiting ability,the very low loss caused and the optimized propagation length.Then use two different ways to construct Bragg grating structures according to the effective refractive index or the widths of the high-refractive-index dielectric layer.By using the admittance matching theory,setting the same kind of admittance matching structures at both ends to optimize the transmission spectrum at specified wavelength bands.Thereby obtaining an element structure suitable for different filtering conditions.Finally,the effect of different construction methods on the transmission spectrum of chirped structure is studied.At the same time,different admittance matching structures are provided at both ends to optimize the transmission spectrum at specified wavelength bands,and a wide band TM filter element structure with adjustable bands is realized.Through the work of this paper,two kinds of hybrid plasmonic waveguide structure are studied,with the loss is effectively reduced while the propagation length is increased.Through the investigation of the hybrid plasmonic waveguide Bragg gratings,an ultra-low loss polarizer 0with high tolerance rate,dual-mode filtering and adjustable band gap was designed.By constructing a chirp structure,a TM filter element structure with a wide and adjustable band gap is designed.By using admittance matching theory to analyze and optimize the transmission spectrum of the specified wave band.It has certain application value in the field of integrated optics.