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Microscope photograph of a STJ direct detector. Linearly distributed junctions are integrated on two wings of a log-periodic antenna, whose radius is about . The spectral response of the STJ detector is determined by a resonance circuit in the distributed junctions, while that of the log-periodic antenna is relatively broad, from , so as not to disturb the detector spectral response.
Schematic of the BWO imaging system with the STJ detector. The numbers on the optical elements indicate their effective focal lengths in millimeters.
Terahertz image of a railway payment IC card. This card is in size and thick. The scanning step is .
Left: A nylon bag containing dehydrated milk powder, about in thickness, in which three needles were inserted. Right: The terahertz image of the central area with the scanning step of , revealing the needles.
(a) A terahertz image of a hole in aluminum foil. The scanning step is . The pixel time is set to be three times longer than the integration time. The chopping frequency is set to throughout the measurements. (b) Imaging performance of the terahertz detectors. The filled diamonds and open triangles show measurement data from the same STJ detector operated at 0.3 and , respectively. For comparison, data from a room temperature DLATGS sensor are shown as open squares. Each straight line fits the data with a linear function of the square root of the integration time.
Comparison of STJ direct detectors and semiconductor/TES bolometers.
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