Electromagnetic wave detection element and electromagnetic wave detection device using the same

An electromagnetic wave detection element comprising

• a plurality of structure units each comprising a flat and electrically insulating substrate,
• a first superconducting electrode disposed on the substrate,
• a second superconducting electrode opposed to an upper part of the first superconducting electrode,
• an insulating film not less than 5 nm and not more than 10 nm in thickness and sandwiched between the first and second superconducting electrodes, with parts of cross sections of the second superconducting electrode and insulating film formed on the upper part of the first superconducting electrode, and
• a normal conducting line not more than 100 nm in width, not more than 100 nm in thickness and passing just once through the cross sections of the second superconducting electrode and insulating film to form a sole weak link and establish electric connection of the first and second superconducting electrodes,
• wherein the first superconducting electrode of each of the structure units is serially connected to an adjacent second superconducting electrode, the first or second superconducting electrodes of opposite end units are connected to leading lines, and the cross sections of the insulating films allowing passage of the normal conducting lines are disposed so as to face a same direction with respect to the plurality of structure units laid throughout between the leading lines.