Ghost spintronic THz-emitter-array microscope
Si-Chao Chen, Zheng Feng, Jiang Li, Wei Tan, Liang-Hui Du, Jianwang, Cai, Yuncan Ma, Kang He, Haifeng Ding, Zhao-Hui Zhai, Ze-Ren Li, Cheng-Wei, Qiu, Xi-Cheng Zhang, Li-Guo Zhu

TL;DR
This paper introduces a novel THz near-field microscopy technique using a reconfigurable spintronic emitter array with computational ghost imaging, enabling deeply sub-diffraction, polarization-free, real-time imaging for bioapplications.
Contribution
The work presents a reconfigurable spintronic THz emitter array combined with ghost imaging for non-invasive, high-resolution, real-time THz microscopy, surpassing traditional scanning methods.
Findings
Achieved deeply sub-diffraction resolution imaging.
Enabled polarization-free contrast through magnetic field circulation.
Demonstrated depth resolution with time-of-flight measurements.
Abstract
Terahertz (THz) wave shows great potential in non-destructive testing, bio detection and cancer imaging. Recent progresses on THz wave near-field probes/apertures enable mechanically raster scanning of an object's surface in the near-field region, while an efficient, non-scanning, non-invasive, deeply sub-diffraction-limited imaging still remains challenging. Here, we demonstrate a THz near-field microscopy using a reconfigurable spintronic THz emitter array (STEA) with computational ghost imaging. By illuminating an object with the reconfigurable STEA in near field and computing the correlation measurements, we reconstruct its image with deeply sub-diffraction resolution. By circulating an external magnetic field, the in-line polarization rotation of THz waves is realized, making the fused image contrast polarization-free. The time-of-flight (TOF) measurements of coherent THz pulses…
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Taxonomy
TopicsTerahertz technology and applications · Superconducting and THz Device Technology · Photonic and Optical Devices
