Tianlong Wen, Jing Tong, Dai-nan Zhang, Yunqiao Zhu, Qi-Ye Wen, Yuanpeng Li, Huai-Wu Zhang, Yu-Lan Jing, Zhi-Yong Zhong
https://iopscience.iop.org/article/10.1088/1361-6463/ab146d/pdf
Spatial modulation of terahertz wave enabled by the charge carrier generation-recombination dynamics in semiconductor is promising for terahertz compressive sensing imaging since the modulation is broadband, low-loss and of enough speed (tens of thousands of Hertz). However their performance in terahertz compressive sensing imaging is significantly limited by their inferior modulation depth and resolution. Here silicon was cut into small pieces and packed closely in arrays to shut off the charge carrier diffusion between them and increase the resolution of the terahertz spatial modulator. A monolayer of gold nanoparticles was coated on the silicon surface to enhance the terahertz modulation depth through the enhanced generation of charge carriers by surface plasma. By comparison test, it is found that the gold nanoparticle coated small silicon arrays have improved contrast and resolution for terahertz imaging over the uncoated and coated large pieces of silicon respectively.
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