Design And Performance Study Of Functional Devices Based On Photonic Crystals

Photonic crystals (PCs) are Periodic dielectric structures fabricated artificially.As a new type of optical materials, because of its unique properties such as photonicband gap and photon localization, photonic crystal can freely control the movement ofthe photon and be used to make high-performance optoelectronic devices which arebased on new principle or can not be made previously. Due to its advantages of highstability, high speed and high integration and the advantages of high processing speedand non-interacting relative to the electron, design of new functional devices based onphotonic crystal has become a research hotspot in the field of optics.The study is based on transfer matrix method (TMM), the plane wave expansionmethod (PWM), the finite difference time domain method (FDTD), the coupled-modetheory (CMT) and super cell technology (Supercell). On the study of1D photoniccrystal, we firstly used photonic crystals to detect the water content in heavy oil. Awater content sensor model was presented with the help of the band gap propertiesand defects effects of photonic crystals. The sensor has high sensitivity and goodlinearity which has a certain reference value to theoretical research on the quality ofthe industrial heavy oil. On the study of2D photonic crystal, we put forward somenew models. For instance,①A Y-branch demultiplexer based on Kagomé latticephotonic crystals. When both of the k matching and group velocity matching aresatisfied,100%dropping efficiency for each output channel will be achieved byselecting the parameters reasonably. The study result provides very good referencebasis for designing the efficient photonic crystals demultiplexer.②An opticalswitch based on coupled heterostructure photonic-crystal waveguides. We constructeda coupled heterostructure photonic-crystal waveguides based on the principle ofdirectional coupling. The dispersion curves were used to calculate the couplinglengths. And then we chose the optimal structure parameters for the switch.③Aperfect lens based on2D honeycomb lattice photonic crystals. By calculating the bandstructure, equifrequency contours and equivalent refractive index of the photoniccrystal, we chose the frequency which make that value of the equivalent refractiveindex equals-1and proved the negative refraction and focusing properties of it.