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

29th International Symposium on Superconductivity

Sone, M.^1 ; Igarashi, N.^1 ; Naruse, M.^1 ; Myoren, H.^1 ; Sasaki, Y.^2 ; Otani, C.^2 ; Taino, T.^1

Graduate School of Science and Engineering, Saitama University, 225 Shimo-Ohkubo, Sakura-ku, Saitama

338-8570, Japan^1

RIKEN, 519-1399 Aramaki Aoba, Aoba-ku, Sendai, Miyagi

980-0845, Japan^2

关键词: Dicing process;    Diffusion characteristics;    Phonon diffusion;    Spatial resolution;    Superconducting tunnel junction;    THz photon;    THz waves;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/871/1/012069/pdf
DOI  :  10.1088/1742-6596/871/1/012069

来源: IOP

【 摘 要 】

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 LiNbO3substrate by detecting THz photons. We found that the phonon diffusion length in a 500-μm-thick LiNbO3substrate was over 1 mm. No degradation of the current - voltage (I-V) characteristics of the STJ after performing the dicing process.