期刊
IEEE TRANSACTIONS ON TERAHERTZ SCIENCE AND TECHNOLOGY
卷 10, 期 5, 页码 554-557出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TTHZ.2020.2997599
关键词
Antenna arrays; field-effect transistors; flexible electronics; graphene; terahertz detectors; two-dimensional (2-D) materials; radiation patterns
资金
- EU Graphene Flagship Core 2 Project [785219]
- Swedish Research Council (VR) [2017-04504]
- Information and Communication Technology (ICT) Area of Advance (AoA) of Chalmers University of Technology
- Swedish Research Council [2017-04504] Funding Source: Swedish Research Council
Terahertz imaging has potential in a variety of applications, such as noninvasive inspection, medical examination, and security. Many of these applications call for flexible focal-plane arrays with large fields of view. Here, we demonstrate the implementation of a flexible, 300 GHz, 1 x 6 linear detector array based on graphene field-effect transistors and integrated bow-tie antennas. Conservative estimates based on room temperature measurements at 300 GHz show element voltage responsivities in the range from 20 to 70 V/W, and noise equivalent powers in the range from 0.06 to 0.2 nW/root Hz. Measured radiation patterns, showing good agreementwith simulations, reveal half-power beamwidths of 45. and 60. forH- andE-planes, respectively. Characterization of the antenna array in a curved configuration shows that the voltage response is reduced up to 3 dB compared to the flat configuration due to a decrease of the antenna directivity. We believe that our preliminary results could serve as an enabling platform for the future development of flexible antenna arrays based on graphene field-effect transistors for curved focal plane imaging, important for wearable sensors and many other applications.
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