Dual-color terahertz spatial light modulator for single-pixel imaging
作者机构：Research Institute of Superconductor Electronics(RISE)School of Electronic Science and EngineeringNanjing UniversityNanjing 210023China School of Electronic Science and EngineeringNanjing UniversityNanjing 210023China Purple Mountain LaboratoriesNanjing 211111China National Laboratory of Solid State MicrostructuresCollaborative Innovation Center of Advanced Microstructures and College of Engineering and Applied SciencesNanjing University163 Xianlin AvenueNanjing 210023China
出 版 物：《Light(Science & Applications)》 (光（科学与应用)（英文版）)
年 卷 期：2022年第11卷第7期
页 面：1585-1594页
核心收录：
学科分类：0831[工学-生物医学工程（可授工学、理学、医学学位）] 070207[理学-光学] 1002[医学-临床医学] 07[理学] 0804[工学-仪器科学与技术] 0805[工学-材料科学与工程（可授工学、理学学位）] 0702[理学-物理学]
基 金：supported by the National Key Research and Development Program of China(2017YFA0700202,2021YFB2800701) National Nature Science Foundation of China(61731010,62071217,61971465,62027807,61871212,62025108,62035014) Fundamental Research Funds for the Central Universities,and Research Fund for Jiangsu Key Laboratory of Advanced Techniques for Manipulatinp Electromagnetic Waves.
摘 要：Spatial light modulators(SLM),capable of dynamically and spatially manipulating electromagnetic waves,have reshaped modern life in projection display and remote sensing.The progress of SLM will expedite next-generation communication and biomedical imaging in the terahertz(THz)range.However,most current THz SLMs are adapted from optical alternatives that still need improvement in terms of uniformity,speed,and bandwidth.Here,we designed,fabricated,and characterized an 8×8THz SLM based on tunable liquid crystal metamaterial absorbers for THz single-pixel compressive imaging.We demonstrated dual-color compressive sensing(CS)imaging for dispersive objects utilizing the large frequency shift controlled by an external electric field.We developed auto-calibrated compressive sensing(ACS)algorithm to mitigate the impact of the spatially nonuniform THz incident beam and pixel modulation,which significantly improves the fidelity of reconstructed images.Furthermore,the complementary modulation at two absorption frequencies enables Hadamard masks with negative element values to be realized by frequency-switching,thereby halving the imaging time.The demonstrated imaging system paves a new route for THz single-pixel multispectral imaging with high reliability and low cost.
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