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. 2021 May 18;21(10):3510. doi: 10.3390/s21103510

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© 2021 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).

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The radiation patterns measured with different Ti- $μ$ bolometers placed at $z = 10$ mm position: Panel (a)—0.3 THz $μ$ bolometer; panel (b)—0.7 THz Ti- $μ$ bolometer, panel (c)—wideband Ti- $μ$ bolometer. Grey lines indicate intensity center cross-sections along the relevant axes. Note particular spatial mode profiles clearly resolved by different antenna-coupled Ti- $μ$ bolometers. Panels (d–f) depict $x - z$ and $y - z$ scans from 10 mm to 50 mm along z direction for 0.3 THz, 0.7 THz and wideband Ti- $μ$ bolometers, respectively.