| In recent years,the research of terahertz(THz)and photonic crystals has shown a spurt of growth.Due to the importance of these two technologies and the broad development prospects,it has attracted great attention.With the development of terahertz technology,applying a photonic crystal structure to the terahertz frequency band can design a new low-loss,wide-band bandpass filter.Terahertz photonic crystal filters have excellent frequency selection,gain equalization,low loss,etc.and have more excellent filtering characteristics compared with traditional terahertz filters.Therefore,the study of the transmission characteristics of terahertz waves in photonic crystals has excellent construction performance.And the terahertz photonic crystal filter applied in the terahertz communication system has important theoretical research value and practical significance.This article considers these two popular technologies together and simulates the regulation of photonic crystals by software to achieve the purpose of controlling THz,which provides theoretical support for the actual production and utilization of THz and photonic crystals.This article mainly studies photonic crystals from the following aspects,including onedimensional ultrasonic photonic crystals and ultrasonic modulation of photonic crystals.The main research contents are as follows:(1)Through the study of one-dimensional ultrasonic photonic crystals,the elasto-optical effect caused by the ultrasonic wave incident on the crystal is carefully analyzed,and the photonic band gap can be adjusted by changing the wavelength and amplitude of the ultrasonic wave and the incident angle of the optical wave effect.The study found that the photonic band gap in the THz band can be modulated by ultrasound to achieve the frequency selection effect in the THz band.(2)Theoretical analysis of the modulation of the photonic crystal band gap by ultrasonic waves,including the effect of different polarized light on the band gap.The results of the study show that the photonic band gap in THz band can be modulated by ultrasonic waves to achieve the effect of frequency selection in THz band,and the band gap range basically covers the Terahertz band(0.1THz～10 THz).(3)The band gap modulation of photonic crystals by ultrasonic wave including the influence of different polarized light on the band gap is studied theoretically.The results show that the band gap of photonic crystals is on the order of 103 nm.What is different from photonic crystals is that the band gap falls on the order of 104nm after the ultrasonic wave is on the photonic crystal,which is an order of magnitude different.According to Bragg conditions,the band gap position is determined by the wavelength of ultrasonic wave. |
