Study On Photonic Crystal Defects Slow-light And Integrated Properties And The Applications In Microwave Photonic Devices

With the emergency development of modern social information interaction, and the growing demands for people to people and people to things communications, a variety of new business, new technologies gradually emerged. Data services and wireless communications industry is booming, but as a basis for carrying all wireless communications -spectrum resources, especially the current 4G and the future 5G business?intensive 2GHz-5GHz band, the application of about 1GHz spectrum resources almost consumed. For this reason, the future development of the network will inevitably tend to millimeter wave band. In order to adapt to the characteristics of the millimeter-wave band, a technique capable of processing microwave signals in the optical domain is proposed -microwave photonics. In recent years, the microwave photonics have achieved a lot of attention, and huge part of microwave photonics research focused on the basic physical effects and the basic physical device.In this research background, photonic crystal as a low loss, good locality, easy integration materials, gradually into the microwave photon scholars of the research field. The photonic crystal waveguide (PCW) can be formed by introducing a line defect in the complete photonic crystal.The light in the original completely photonic crystal opaque bandgap can propagate along the line defect, which is a new type of large-scale photonic integration (PIC) One of the important components. Since the periodicity(lattice constant) of the photonic crystal is in the order of wavelength, the volume of the photonics device is extremely small, and the silicon-based flat two-dimensional sub-crystal device can be combined with the current semiconductor process, making it easier to integrate. Photonic crystal optical waveguide corner angle can still be achieved when the low loss or even zero loss of optical transmission, which served the traditional waveguide and fiber at the bend of the large loss of the shortcomings; two-dimensional photonic crystal optical waveguide can also get low group speed, It is easier to realize the modulation of the light wave. The good local effect of the photon crystal for the photon can be applied to the design of the base station solar cell to achieve high absorption efficiency. These properties make photonic crystals, especially two-dimensional planar photonic crystals, a potential application material for microwave photonic devices. It is important to study the characteristics of photonic transmission,coupling and slow light for photonic crystals.In this paper, we focused on the coupling and slow light properties of photonic crystal defects, the major innovation include:(1) In order to solve the problem that the existing microwave photonic filter is large in size and difficult to integrate, two kinds of single-sideband(SSB) RoF can be applied to the advantages of photonic crystal waveguide slow light and low loss. (Free Spectrum Range, FSR) of up to 130GHz,3dB bandwidth of 4.12GHz, extinction ratio of 22dB; another one of the non-band filter frequency spectrum width (Free Spectrum Range, FSR)The bandpass filter bandwidth of 4.02GHz, extinction ratio of 19.6dB, 10-7 bit error rate required signal to noise ratio can be reduced by 9dB. The photonic crystal waveguide characteristics of polarized beam splitting slow light, U - waveguide are designed and simulated. The field distribution and transmission characteristics of microwave photonic filter are simulated by Rsoft software.(2) Aiming at the problem that the coupling efficiency between the photonic crystal waveguide and the microcavity is too low, we research on the coupled system with reflection microcavity. The coupled microcavity coupling system is deduced and simulated. With proper design of the distance between cavities, we significantly enhance the coupling efficiency.Moreover, a photonic crystal demultiplexer with implantation technique and reflection microcavity is designed by using the coupling system. The efficiency of the communication at 1550nm is more than 95%. A symmetrical microcavity sensor is used to improve the sensing intensity.The sensoruses the air pore structure to adsorb biological macromolecules,and simulates the relationship between the macro molecule capture thickness and the microcavity migration.(3) A 2 x 2 all-optical gate designed based on the demand of green,high efficiency and flexibility of the communication industry and the future trend offfuture microwave photonic network function. Based on the square lattice photonic crystal waveguide multi-mode coupling theory, two multi-mode coupling structure integration. Without affecting the positive and negative threshold conditions, we design and simulate the integrated 3×3 multi-function logic gate. We can achieve OR, NOT, NAND, XOR and XNOR logic operations, all logic functions have the positive and negative extinction ratio as high as 20dB.(4) The microwave photonic systems have big capacity, small cells properties and the systems expect to apply for web of things and sensor network. The huge energy consumption should also considered. Based on the Perovskite structure material CH3NH3PbI3, we design a vertical cone photonic crystal green solar cell to trap 92% solar light energy in 300nm-900nm range, resulting in a maximum achievable photocurrent density(MAPD) of 25.1 mA / cm2. We also design a soalr cell to absorb 300nm-850nm solar lights based on CH (NH2) 2PbI3 materials, which has a positive imaginary refractive index in 800nm-850nm range. For this solar cell,we get a MAPD of 29.1 mA/cm2, which equal to 23.4% photoelectric conversion efficiency of the total solar energy.