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.

Abstract-Flat Terahertz Reflective Focusing Metasurface with Scanning Ability

Huan Yi, Shi-Wei Qu, Bao-Jie Chen, Xue Bai, Kung Bo Ng,  Chi Hou Chan

https://www.nature.com/articles/s41598-017-03752-3

The ability to manipulate the propagation properties of electromagnetic waves, e.g., divergence, focusing, holography or deflection, is very significant in terahertz applications. Metasurfaces with flat structures are attractive for achieving such manipulations in terahertz band, as they feature low profile, lightweight, and ease of design and installation. Several types of terahertz reflective or transmitting metasurfaces with focusing function have been implemented recently, but none of them can provide scanning ability with controllable focus. Here, a flat reflective metasurface featuring controllable focal shift is proposed and experimentally demonstrated. Furthermore, the principle of designing a focus scanning reflective metasurface is presented and the focusing characteristics are discussed, including focus scanning along a line parallel or orthogonal to the metasurface with a large bandwidth. These interesting properties indicate that this flat reflective metasurface could play a key role in many terahertz imaging and detection systems.

Abstract-Controlling Dispersion Characteristics of Terahertz Metasurface

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  Shi-Wei Qu,
• Wei-Wei Wu,
• Bao-Jie Chen,
• Huan Yi,
• Xue Bai,
• Kung Bo Ng
• & Chi Hou Chan

• Affiliations
• Contributions
• Corresponding author

Scientific Reports

 

http://www.nature.com/srep/2015/150323/srep09367/full/srep09367.html

Terahertz (THz) metasurfaces have been explored recently due to their properties such as low material loss and ease of fabrication compared to three-dimensional (3D) metamaterials. Although the dispersion properties of the reflection/transmission-type THz metasurface were observed in some published literature, the method to control them at will has been scarcely reported to the best of our knowledge. In this context, flexible dispersion control of the THz metasurface will lead to great opportunities toward unprecedented THz devices. As an example, a THz metasurface with controllable dispersion characteristics has been successfully demonstrated in this article, and the incident waves at different frequencies from a source in front of the metasurface can be projected into different desired anomalous angular positions. Furthermore, this work provides a potential approach to other kinds of novel THz devices that need controllable metasurface dispersion properties.

Subject terms:

• Electrical and electronic engineering
• Metamaterials
• Surfaces, interfaces and thin films
• Terahertz optics

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Abstract-Applications of spoof planar plasmonic waveguide to frequency-scanning circularly polarized patch array

Xue Bai, Shi-Wei Qu and Huan Yi

shiweiqu@uestc.edu.cn

School of Electronic Engineering, University of Electronic Science and Technology of China (UESTC), Chengdu 611731, People's Republic of China 

http://iopscience.iop.org/0022-3727/47/32/325101

Spoof planar plasmonic waveguides (SPPWs) show potential applications in many microwave and terahertz systems, e.g. imaging, communication and sensing, due to their capability of highly confining spoof surface plasmon polaritons (SPPs) and relatively low propagation loss. Meanwhile, efficient electromagnetic emission from the SPPWs is one of the dominant factors in the practical applications. In this article, we demonstrate a beam-scanning circularly polarized (CP) antenna based on the SPPW of blind-hole array, which can efficiently convert spoof SPPs propagating in the SPPW into free-space emissions. Several centre-inclined rectangular patches are adopted to achieve the CP emission. The antenna array was designed and fabricated in the microwave frequency band, and the measured results validate the good emission performance of the proposed array, e.g. high gain and wide-scan angle. Finally, the proposed idea can be further extended into the terahertz frequency band.