{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,4,6]],"date-time":"2026-04-06T20:18:55Z","timestamp":1775506735814,"version":"3.50.1"},"reference-count":30,"publisher":"MDPI AG","issue":"15","license":[{"start":{"date-parts":[[2021,7,31]],"date-time":"2021-07-31T00:00:00Z","timestamp":1627689600000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/501100001809","name":"National Natural Science Foundation of China","doi-asserted-by":"publisher","award":["61975223, 61874126, 91850208, 61991442, 61521005"],"award-info":[{"award-number":["61975223, 61874126, 91850208, 61991442, 61521005"]}],"id":[{"id":"10.13039\/501100001809","id-type":"DOI","asserted-by":"publisher"}]},{"name":"Hundred Talents Program of the Chinese Academy of Sciences","award":["No. 20181214"],"award-info":[{"award-number":["No. 20181214"]}]},{"name":"Key Deployment Projects of the Chinese Academy of Sciences","award":["ZDRW-XH-2021-7-1"],"award-info":[{"award-number":["ZDRW-XH-2021-7-1"]}]},{"name":"Fund of Shanghai Science and Technology Foundation","award":["18ZR1446000, 18JC1420401"],"award-info":[{"award-number":["18ZR1446000, 18JC1420401"]}]},{"name":"Shanghai Municipal Science and Technology Major Project","award":["Grant No.2019SHZDZX01"],"award-info":[{"award-number":["Grant No.2019SHZDZX01"]}]},{"name":"ShanghaiTech University Quantum Device Lab; Shenzhen Science and Technology Program","award":["Grant No. KQTD20190929173954826"],"award-info":[{"award-number":["Grant No. KQTD20190929173954826"]}]},{"DOI":"10.13039\/501100012166","name":"National Key Research and Development Program of China","doi-asserted-by":"publisher","award":["2017YFA0205800, 2018YFA0306200"],"award-info":[{"award-number":["2017YFA0205800, 2018YFA0306200"]}],"id":[{"id":"10.13039\/501100012166","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Sensors"],"abstract":"<jats:p>Single-wall carbon nanotube (SWCNT) thin films are promising for sensitive uncooled infrared detection based on the photothermoelectric effect. The SWCNT film is usually shaped into a belt and diversely doped to form a p-n junction at the center. Under the illumination of a focused incident light, the temperature gradient from the junction to the contacts leads to photoresponse. When the SWCNTs are aligned in one direction, the photoresponse becomes polarization selective. Although a typical bowtie antenna can improve the responsivity and polarization extinction ratio by deep-subwavelength light focusing, the absolute absorptance of the junction region is only 0.6%. In this work, the antenna was engineered for a higher light coupling efficiency. By integrating a bottom metal plane at a specific distance from the SWCNT film and optimizing the antenna geometries, we achieved ultra-efficient impedance matching between the antenna and the SWCNTs, thus the absorptance of the junction region was further enhanced by 21.3 times and reached 13.5%, which is more than 3 orders of magnitude higher than that of the device without the engineered antenna. The peak responsivity was further enhanced by 19.9 times and responsivity reached 1500 V\/W at 1 THz. The resonant frequency can be tuned by changing the size of the antenna. Over the frequency range of 0.5 THz to 1.5 THz, the peak responsivity was further enhanced by 8.1 to 19.9 times, and the polarization extinction ratio was enhanced by 2.7 to 22.3 times. The highest polarization extinction ratio reached 3.04 \u00d7 105 at 0.5 THz. The results are based on the numerical simulations of the light and the thermal fields.<\/jats:p>","DOI":"10.3390\/s21155221","type":"journal-article","created":{"date-parts":[[2021,8,1]],"date-time":"2021-08-01T21:46:44Z","timestamp":1627854404000},"page":"5221","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":6,"title":["Carbon Nanotube Far Infrared Detectors with High Responsivity and Superior Polarization Selectivity Based on Engineered Optical Antennas"],"prefix":"10.3390","volume":"21","author":[{"given":"Xiansong","family":"Ren","sequence":"first","affiliation":[{"name":"State Key Laboratory of Infrared Physics, Shanghai Institute of Technical Physics, Chinese Academy of Sciences, Shanghai 200083, China"}]},{"given":"Zhaoyu","family":"Ji","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Infrared Physics, Shanghai Institute of Technical Physics, Chinese Academy of Sciences, Shanghai 200083, China"}]},{"given":"Binkai","family":"Chen","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Infrared Physics, Shanghai Institute of Technical Physics, Chinese Academy of Sciences, Shanghai 200083, China"}]},{"given":"Jing","family":"Zhou","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Infrared Physics, Shanghai Institute of Technical Physics, Chinese Academy of Sciences, Shanghai 200083, China"}]},{"given":"Zeshi","family":"Chu","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Infrared Physics, Shanghai Institute of Technical Physics, Chinese Academy of Sciences, Shanghai 200083, China"}]},{"given":"Xiaoshuang","family":"Chen","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Infrared Physics, Shanghai Institute of Technical Physics, Chinese Academy of Sciences, Shanghai 200083, China"}]}],"member":"1968","published-online":{"date-parts":[[2021,7,31]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"97","DOI":"10.1038\/nphoton.2007.3","article-title":"Cutting-edge terahertz technology","volume":"1","author":"Tonouchi","year":"2007","journal-title":"Nat. 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