We are developing a broadband THz detectors using Nb-based superconducting tunnel junctions. We found two components in a current signal for 1-2 THz pulse input. From the comparison of results obtained for the signals, the frequency response for the different size of STJs and the STJs fabricated on different substrate materials, we demonstrate that they correspond to photons absorbed with the superconductor electrode (referred as 'direct' component) and phonons generated by photons absorbed with the substrate (refered as 'phonon-mediated' component).


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    Title :

    Detection of direct and indirect terahertz waves using a Nb-based superconducting tunnel junction


    Contributors:
    Otani, C. (author) / Shibuya, T. (author) / Ariyoshi, S. (author) / Sato, H. (author) / Shimizu, H.M. (author) / Kawase, K. (author) / Nakano, R. (author) / Taino, T. (author) / Myoren, H. (author) / Takada, S. (author)


    Publication date :

    2005-01-01


    Size :

    1241908 byte




    Type of media :

    Conference paper


    Type of material :

    Electronic Resource


    Language :

    English



    TB2-4 Detection of Direct and Indirect Terahertz Waves using a Nb-based Superconducting Tunnel Junction

    Otani, C. / Nakano, R. / Taino, T. et al. | British Library Conference Proceedings | 2005


    Terahertz detector using a Nb-based superconducting tunnel junction

    Otani, C. / Hoshino, K. / Taino, T. et al. | IEEE | 2004


    Direct Detection of THz Signals with an NbN Superconducting Tunnel Junction

    Shen, Xiao-Fang / Li, Jing / Shi, Sheng-Cai | IEEE | 2006


    Superconducting Tunnel Junction Bolometers

    J. Clarke / G. I. Hoffer / P. L. Richards | NTIS | 1973


    Substrate Effects in Superconducting Tunnel Junction Detectors

    Lemke, S. | British Library Online Contents | 1992