Patent ID: 8294121

Claim:
A fixture comprising a fixing surface in the same shape as an end surface of a device under test which is measured by irradiating an electromagnetic wave to be measured having a frequency equal to or more than 0.01 terahertz and equal to or less than 100 terahertz on the device under test, wherein: the end surface is fixed to the fixing surface; a relationship n 1 −0.1≦n 0 ≦n 1 +0.1 holds, where n 0 denotes a refractive index of the fixture and n 1 denotes a refractive index of the device under test; and the fixture does not cover a side surface of the device under test, wherein the fixture is disposed within a container that includes at least one curved surface portion that at least partially encloses the device under test, the at least one curved surface portion being a lens for refracting the electromagnetic wave.