Design And Measurement Of Terahertz Photonic Crystal Wave Transmitting Device

With the commercialization and accelerated promotion of 5G technology,higher requirements have been imposed on high-frequency communication technologies,including 6G technology.How to apply higher frequency electromagnetic wave bands has been a hot topic for many researches.Terahertz waves are located at 0.1THz-10THz,The development of this region in the past 20 years has filled the development gap of the terahertz technology(THz Gap).Because of its transient nature,high signal-to-noise ratio,coherence,penetration,fingerprint spectrum,low energy and strong absorption of water molecules,Terahertz waves are gradually used in many fields.Now that terahertz sensing and imaging systems have been gradually commercialized,terahertz wireless communication will definitely be the mainstream of newer generation of wireless communications.New device design and research based on terahertz waves can greatly promote the development and applications of terahertz technology.The terahertz time domain spectroscopy(THz-TDS)technology have brought new opportunities for imaging and communication technology.Based on the terahertz spectroscopy system,the optical parameters of the designed device or sample can be measured,obtaining its unique transmittance spectrum,which provides a theoretical and practical basis for device design and application.What we have achieved in the work is consist of three parts:1)After a more in-depth analysis of the principle of terahertz technology and terahertz time-domain spectroscopy system,with the Advantest TAS7400TS terahertz time-domain spectroscopy system,we completed the spectral measurement of silicon wafers,PET and other basic materials.2)The design of terahertz photonic crystal(THz-Phcs)is completed based on the impedance matching theory.3)We experimentally demonstrate the wide-angle impedance matching effect in a one-dimensional THz PhC consisting of high-resistance Si and polyethylene terephthalate(PET)films.Simulation and experimental results demonstrate both high transmission and suppression of Fabry-Perot resonances over a wide incident angle range(0?60°)from 0.26THz to 0.55THz for both TE and TM polarizations.We believe that the proposed PhC provides a unique way to realize reflectionless THz devices,which may find applications in THz spectroscopy and imaging.