Abstract
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 × 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/ √Hz. Measured radiation patterns, showing good agreement with simulations, reveal half-power beamwidths of 45° and 60° for H-and E-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.
Highlights
T ERAHERTZ (THz) imaging is a promising technique for many applications [1]
With the development of high-speed terahertz detectors, flat focal-plane arrays for terahertz imaging have been successfully implemented in different technologies, using detectors based on complementary metal oxide semiconductor transistors [2], [3], high electron mobility transistors [4], Manuscript received February 10, 2020; revised May 12, 2020; accepted May 17, 2020
We present the demonstration of a 1 × 6 linear array based on graphene field-effect transistors (GFETs) coupled with 300-GHz bow-tie antennas on a flexible substrate in both flat and curved configurations
Summary
IEEE TRANSACTIONS ON TERAHERTZ SCIENCE AND TECHNOLOGY, VOL. 10, NO. 5, SEPTEMBER 2020. A Linear-Array of 300-GHz Antenna Integrated GFET Detectors on a Flexible Substrate. Abstract—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. We demonstrate the implementation of a flexible, 300 GHz, 1 × 6 linear detector array based on graphene field-effect transistors and integrated bow-tie antennas. 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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