ELECTROMAGNETIC WAVE DETECTION APPARATUS AND ELECTROMAGNETIC WAVE DETECTION METHOD

An electromagnetic wave detection apparatus includes a radiation unit, a first detection module, a propagation module, and a control unit. The radiation unit is configured to emit an electromagnetic wave. The first detection module includes a plurality of detection elements configured to output result denoting detection of an electromagnetic wave. The propagation module includes a plurality of propagation elements capable of switching between a first state and a second state. The electromagnetic wave is caused to proceed toward the first detection module by the plurality of propagation elements in the first state and is kept from proceeding toward the first detection module by the plurality of propagation elements in the second state. The control unit is configured to cause a first propagation element to transition into the first state and to cause a second propagation element to transition into the second state. The electromagnetic wave proceeds into the first propagation element and does not proceed into the second propagation element. The control unit is configured not to determine, based on detection result output by at least one of the plurality of detection elements into which the electromagnetic wave does not proceed, the detection of the electromagnetic wave.