Improving the spatial resolution of superconducting tunnel junction THz wave detectors using a modified LiNbO3 absorber

We proposed a superconducting tunnel junction (STJ) detector for terahertz (THz) waves with a modified substrate absorber. The absorber of each STJ was isolated by trenches in order to restrict the diffusion of phonons generated by THz waves, which are made with a dicing process. We evaluated the di...

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Bibliographic Details
Published in:Journal of physics. Conference series 2017-07, Vol.871 (1)
Main Authors: Sone, M, Igarashi, N, Naruse, M, Myoren, H, Sasaki, Y, Otani, C, Taino, T
Format: Article
Language:English
Subjects:
Absorbers
Diffusion
Diffusion length
Lithium niobates
Phonons
Physics
Spatial resolution
Substrates
Superconductivity
Terahertz frequencies
Tunnel junctions
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Summary:We proposed a superconducting tunnel junction (STJ) detector for terahertz (THz) waves with a modified substrate absorber. The absorber of each STJ was isolated by trenches in order to restrict the diffusion of phonons generated by THz waves, which are made with a dicing process. We evaluated the diffusion characteristics of phonons in the LiNbO3 substrate by detecting THz photons. We found that the phonon diffusion length in a 500-μm-thick LiNbO3 substrate was over 1 mm. No degradation of the current - voltage (I-V) characteristics of the STJ after performing the dicing process.
ISSN:1742-6588
1742-6596
DOI:10.1088/1742-6596/871/1/012069