Development of Superconducting Tunnel Junction detectors as a far-infrared photon-by-photon spectrometer for neutrino decay search. - Yuji Takeuchi; Shin-Hong Kim; Kenichi Takemasa; Kenji Kiuchi; Kazuki Nagata; Kota Kasahara; Takuya Okudaira; Tatsuya Ichimura; Masahiro Kanamaru; Kouya Moriuchi; Ren Senzaki; Shunsuke Yagi; et al. (I2MTC, 2015)