Terahertz Photonic Crystal Anisotropic Dielectric Characteristics Of Study

The terahertz (1012Hz) radiation occupies a large portion of the electromagnetic spectrum. Due to the lacking of exploration, there was a terahertz (THz) frequency region called"terahertz gap"in the electromagnetic spectrum. The so-called"terahertz gap"is from 30μm to 1 mm in wavelength, which is between far-infrared (photonics) and millimeter wave (electronics). Recently, with a progress on THz wave generation and detection, applications of THz waves have been dramatically developed. It is believed that THz technique has a good future in many fields, such as physics, chemistry, biological medicine, communication, radar, security inspection, etc.Utilizing the THz-TDS in School of Physical Electronics of UESTC, it is convenient for us to obtain theTHz transmission properties of the materials, we have done some researches in the retrevement of the THz optice constants of the materials, calculation of the photonic crystals and designment of the metamaterial in THz region.First, we study the THz test method and retrevement of the optice constants. They include three parts. (1) We systematic introduce the THz-TDS working details. (2) A model developed by T. D. Doney and D. Duvillaret et al is used to discuss the principle and method for optical constants extracting. Introducing into some improvement, we fabricate a MATLAB programme, which can obtain the optical constants fast and precisely.Second, the Photonic Bandgap (PBG) is studied. The band structures of square lattice photonic crystal and hexagonal lattice photonic crystals also have been computed, and we also have discussed the band gaps of the two types photonic crystals. In addition, since the manufacture of photonic crystal in THz range is seldom successed in China, we introduce the designing, fabrication and testing the 2D THz photonic crystals.At last, since metamaterial is the ideal candidate for filter and modulator in THz, using simulation soft CST we abtain the field distribution and S-parameters of many metamaterial with SRR structure, basing on which how four structure parameters in the SRR structure effect the transmission curves is studied. Then we fabricate two different SRRs to prove that the simulation method we used is available and believable...