An electromagnetic wave detection apparatus (1, 511) configured to detect a characteristic of a resonator structure (110, 130) made of a meta-material formed in a part of a medium being transported in a transport direction (X-axis direction) to pass a predetermined position, the electromagnetic wave detection apparatus (1, 511) comprising: a first detector channel comprising a first transmission element configured to transmit a first terahertz electromagnetic wave having a first polarization direction to the medium and a first reception element configured to receive the first terahertz electromagnetic wave having the first polarization direction from the medium; a second detector channel comprising a second transmission element configured to transmit a second terahertz electromagnetic wave having a second polarization direction different from the first polarization direction to the medium and a second reception element configured to receive the second terahertz electromagnetic wave having the second polarization direction from the medium; and a controller configured to detect the characteristic of the resonator structure (110, 130) of the medium from portions of the first terahertz electromagnetic wave and the second terahertz electromagnetic wave that have been received by the first reception element and the second reception element respectively, characterized in that the first detector channel and the second detector channel are arranged along a width direction (Y-axis direction) of the transport path perpendicular to the transport direction (X-axis direction) such that the first terahertz electromagnetic wave and the second terahertz electromagnetic wave can be applied to the resonator structure (110, 130) when the medium passes the predetermined position. a first detector channel comprising a first transmission element configured to transmit a first terahertz electromagnetic wave having a first polarization direction to the medium and a first reception element configured to receive the first terahertz electromagnetic wave having the first polarization direction from the medium; a second detector channel comprising a second transmission element configured to transmit a second terahertz electromagnetic wave having a second polarization direction different from the first polarization direction to the medium and a second reception element configured to receive the second terahertz electromagnetic wave having the second polarization direction from the medium; and a controller configured to detect the characteristic of the resonator structure (110, 130) of the medium from portions of the first terahertz electromagnetic wave and the second terahertz electromagnetic wave that have been received by the first reception element and the second reception element respectively, characterized in that the first detector channel and the second detector channel are arranged along a width direction (Y-axis direction) of the transport path perpendicular to the transport direction (X-axis direction) such that the first terahertz electromagnetic wave and the second terahertz electromagnetic wave can be applied to the resonator structure (110, 130) when the medium passes the predetermined position.