| 摘要 |
The present invention is drawn to a method for polarizing an electromagnetic wave having a frequency of not less than 0.1 THz and not more than 0.8 THz using a polarizer, the method comprising a step (a) of preparing the polarizer; wherein the polarizer comprises: a sapphire single crystalline layer; and a CaxCoO2 crystalline layer; the CaxCoO2 crystalline layer is stacked on the sapphire single crystalline layer; a surface of the CaxCoO2 crystalline layer has a (100) plane orientation; and the CaxCoO2 crystalline layer has a thickness of not less than 2 micrometers and not more than 20 micrometers, and a step (b) of irradiating the polarizer with the electromagnetic wave having a frequency of not less than 0.1 THz and not more than 0.8 THz to output an output wave having only a component parallel to a c-axis direction of the sapphire single crystalline layer. |
