Properties Of Lattice Graded Two-Dimensional Photonic Crystals And Their Applications In Side-coupled Sensor Arrays

Photonic crystals are regular optical structures made up of periodically arranged media of different refractive indices.One of the most important characteristics of photonic crystals is the photonic band gap,which can block photons in a particular frequency band and thus control the motion of photons.Different from traditional optical devices such as optical fiber,photonic crystal displays a new mechanism to control photons,which brings new life and vitality to the development of optical communications.In addition,photonic crystals are very promising in optical,computer,integrated,and all-optical systems because of their small size.After the concept of photonic crystals was proposed,many different photonic crystal based devices have been invented.The main achievements of this paper are as follows:Firstly,the band pass filter composed of lattice graded W1 waveguide array and its characteristics are studied.The waveguide array is based on a two-dimensional photonic crystal slab made up of a W1 waveguide and introduces a lattice gradient structure.The W1 waveguide itself is a bandpass filter with wider passband,and the passband range is linearly related to the lattice constant a when other parameters remain unchanged.For W1 waveguides with different lattice constants,the range of the passband is also different.That is,the light located in the passband of a W1 waveguide may be located in the stop band of another block.When the multi W1 waveguides are connected together,the common passband will be smaller than the passband size,and the bandwidth tunable bandpass filter will be formed.In addition,the characteristic parameters of the photonic crystal sensor are optimized.According to the proposed photonic crystal sensing detection model and sensing application requirements,external characteristics of sensor parameters are introduced.Simulation of optical in the photonic crystal sensing model and the transport properties of light field distribution characteristics are studied.We research and analyse the application of photonic crystal structure characteristics and stability.Numerical analysis of the Q value,sensitivity and other characteristics of sensor parameters are done according to the calculation results.We further optimize the design to improve the local properties of light to improve the Q and the sensitivity.While optimizing sensitivity,we consider the mass sensing characteristics and the tradeoff between Sm and S.Based on optimized single cavity and lattice graded photonic crystal waveguide array,we put forward photonic crystal sensor array that has many advantages such as new multiplexing method,high single cavity performance,high independence,and controllable resonant frequency spacing.Finally,based on sensing array and double cross beam structure,three micro cavities in the photonic crystal waveguide are introduced and the resonant frequency of them are different.The sensor array is put below a cross double beam structure.Deformation occurs when the force press the beam,column beam of different height respectively into the cavity.The resonant peaks shif orderly and wide range sensor can be achieved.In this paper,a number of microcavities are used to measure a physical quantity for the first time.The sensor array with conditional design for high sensitivity and large range of photonic crystal sensing arrays is extensible and provides a realization of the range of expandable photon sensor arrays.