Abstract-Controlling the terahertz radiation with subwavelength blocky patterned CoFeB/Pt heterostructures

Bangju Song, Yuna Song, Shunnong Zhang, KaiLong Jin, Weihua Zhu, Qin Li, Zongzhi Zhang, Xian Lin, Ye Dai, Xiaona Yan,

https://iopscience.iop.org/article/10.7567/1882-0786/ab4d2b/pdf

We report the broadband emission of THz pulse in the metallic patterned ferromagnetic heterostructures CoFeB/Pt based on inverse spin-Hall effect, by illuminating a train of linearly polarized 120 fs-wide laser pulses at 800 nm. The spatial-temporal distribution of charge currents by changing the length of the subwavelength rectangular metal-blocks allows not only effectively controlling the magnitude, but also subtly tuning the center frequency and bandwidth of the emitted THz pulses. Our results will open new avenues for the study of modulated spintronic-based THz emitters.

Abstract-A Novel CMOS Multi-band THz Detector with Embedded Ring Antenna

• Lei-jun Xu, 
• Jia-ning Guan, 
• Xue Bai, 
• Qin Li, 
• Han-ping Mao
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https://link.springer.com/article/10.1007/s10762-017-0411-0

To overcome the large chip area occupation for the traditional terahertz multi-frequency detector by using the antenna elements in a different frequency, a novel structure for a multi-frequency detector is proposed and studied. Based on the ring antenna detector, an embedded multi-ring antenna with multi-port is proposed for the multi-frequency detector. A single-ring and dual-ring detectors are analyzed and designed in 0.18 μ m CMOS. For the single-ring detector, the best responsivity and NEP is 701 V/W and 261 pW/Hz0.5 at the frequency of 290 GHz. For the dual-ring detector, the best responsivity is 367 V/W and 297 V/W, NEP is 578 pW/Hz0.5 and 713pW/Hz0.5, at the frequency of 600 GHz and 806 GHz, respectively. This embedded multi-ring detector has a simple structure which can be expanded easily in a compact size.