Study On The Regulation Of THz Waves By Ni Nanowire Ordered Arrays

Compared with the rapid development of THz radiation and detection technology,the research of terahertz regulation technology is still in its initial stage.Due to the excellent optical anisotropy effect,one-dimensional metal and semiconductor nanomaterials,especially one-dimensional nanomaterials ordered arrays,have attracted great attention in the field of THz modulation in the recent years.Based on Ni nanowires,this paper explores the regulation of THz waves by Ni nanowire ordered arrays.The main results are as follows:（1）The order and polarization properties of Ni nanowire arrays were studied by THz time domain spectroscopy.The results show that Ni nanowire ordered arrays have good optical anisotropy effects.The polarization degree and extinction ratio of the ordered array with a density of 3.0×10⁸cm^-2were 97.2%and 18.6d B,respectively.（2）A mechanical THz broadband modulator based on a sandwich structure with polydimethylsiloxane（PDMS）/Ni nanowire ordered arrays/polydimethy-lsiloxane was prepared.（3）A compressing-stretching platform was designed and prepared.Using this platform,the dynamic regulation of THz wave by PDMS/Ni NW/PDMS sandwich structure was studied.The results show that:a)When the platform is stretched along the radial direction of the nanowire,the optical anisotropy of the Ni nanowire array is significantly improved;b)When the platform is compressed along the same direction with the strain increasing from 0%to 6.5%,the modulation depth of the device increases linearly;c)When the deformation is 8%,the average modulation depth of the device is 79%in the frequency range of 0.3-2.4THz,and reaches a maximum modulation depth of 89%at 0.76THz;d)This device has no characteristic absorption peak in the frequency range of 0.3-2.4THz,and has good broadband modulation characteristics of THz wave.