Terahertz(THz)waves show great potential in nondestructive testing,biodetection and cancer imaging.Despite recent progress in THz wave near-field probes/apertures enabling raster scanning of an object’s surface,an ef...Terahertz(THz)waves show great potential in nondestructive testing,biodetection and cancer imaging.Despite recent progress in THz wave near-field probes/apertures enabling raster scanning of an object’s surface,an efficient,nonscanning,noninvasive,deep subdiffraction imaging technique remains challenging.Here,we demonstrate THz near-field microscopy using a reconfigurable spintronic THz emitter array(STEA)based on the computational ghost imaging principle.By illuminating an object with the reconfigurable STEA followed by computing the correlation,we can reconstruct an image of the object with deep subdiffraction resolution.By applying an external magnetic field,inline polarization rotation of the THz wave is realized,making the fused image contrast polarization-free.Time-of-flight(TOF)measurements of coherent THz pulses further enable objects at different distances or depths to be resolved.The demonstrated ghost spintronic THz-emitter-array microscope(GHOSTEAM)is a radically novel imaging tool for THz near-field imaging,opening paradigm-shifting opportunities for nonintrusive label-free bioimaging in a broadband frequency range from 0.1 to 30 THz(namely,3.3-1000 cm^(−1)).展开更多
基金supported by the National Key Research and Development Program(No.2017YFC1200400)the Science Challenge Project(No.TZ2018003)+2 种基金the Distinguished Young Scholars of Sichuan Province(No.2020JDJQ0008)the National Natural Science Foundation of China(NSFC)(Nos.U1730246 and 11704358)the Foundation of President of China Academy of Engineering Physics(No.201501033).
文摘Terahertz(THz)waves show great potential in nondestructive testing,biodetection and cancer imaging.Despite recent progress in THz wave near-field probes/apertures enabling raster scanning of an object’s surface,an efficient,nonscanning,noninvasive,deep subdiffraction imaging technique remains challenging.Here,we demonstrate THz near-field microscopy using a reconfigurable spintronic THz emitter array(STEA)based on the computational ghost imaging principle.By illuminating an object with the reconfigurable STEA followed by computing the correlation,we can reconstruct an image of the object with deep subdiffraction resolution.By applying an external magnetic field,inline polarization rotation of the THz wave is realized,making the fused image contrast polarization-free.Time-of-flight(TOF)measurements of coherent THz pulses further enable objects at different distances or depths to be resolved.The demonstrated ghost spintronic THz-emitter-array microscope(GHOSTEAM)is a radically novel imaging tool for THz near-field imaging,opening paradigm-shifting opportunities for nonintrusive label-free bioimaging in a broadband frequency range from 0.1 to 30 THz(namely,3.3-1000 cm^(−1)).
