PROBLEM TO BE SOLVED: To provide a photoconductive antenna capable of enhancing the utilization efficiency of a terahertz wave.SOLUTION: A photoconductive antenna 100 comprises: a photoconductive layer 10; and a first electrode 20 and a second electrode 30 located above a first surface 12 of the photoconductive layer 10, and that apply voltage to the photoconductive layer 10. A second surface 14 at an opposite side to the first surface 12, of the photoconductive layer 10 is a convex surface.SELECTED DRAWING: Figure 1
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