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Terahertz imaging with a direct detector based on superconducting tunnel junctions
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Image of FIG. 1.
FIG. 1.

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.

Image of FIG. 2.
FIG. 2.

Schematic of the BWO imaging system with the STJ detector. The numbers on the optical elements indicate their effective focal lengths in millimeters.

Image of FIG. 3.
FIG. 3.

Terahertz image of a railway payment IC card. This card is in size and thick. The scanning step is .

Image of FIG. 4.
FIG. 4.

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.

Image of FIG. 5.
FIG. 5.

(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.


Generic image for table
Table I.

Comparison of STJ direct detectors and semiconductor/TES bolometers.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Terahertz imaging with a direct detector based on superconducting tunnel junctions