Method for polarizing a terahertz electromagnetic wave using a polarizer
View Patent ↗This disclosure provides a new 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 comprises: a step (a) of preparing the polarizer; wherein the polarizer comprises a sapphire single crystalline layer and a Ca x CoO 2 crystalline layer, the Ca x CoO 2 crystalline layer is stacked on the sapphire single crystalline layer, a surface of the Ca x CoO 2 crystalline layer has a (010) surface orientation, and the Ca x CoO 2 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.
1. 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 Ca x CoO 2 crystalline layer,
the Ca x CoO 2 crystalline layer is stacked on the sapphire single crystalline layer,
a surface of the Ca x CoO 2 crystalline layer has a (010) surface orientation, and
the Ca x CoO 2 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.
2. The method according to claim 1 , wherein
the Ca x CoO 2 crystalline layer has a thickness of not less than 2 micrometers and not more than 9 micrometers.
3. The method according to claim 1 , wherein
the Ca x CoO 2 crystalline layer has a thickness of not less than 2 micrometers and not more than 4 micrometers.
4. The method according to claim 1 , wherein
in the step (b), the sapphire single crystalline layer is irradiated with the electromagnetic wave and the Ca x CoO 2 crystalline layer outputs the output wave.
5. The method according to claim 1 , wherein
in the step (b), the Ca x CoO 2 crystalline layer is irradiated with the electromagnetic wave and the sapphire single crystalline layer outputs the output wave.
6. The method according to claim 1 , wherein
in the step (b), the polarizer is irradiated with the electromagnetic wave travelling along the vertical direction to the polarizer.
7. The method according to claim 6 , wherein
in the step (b), the output wave is output from the polarizer along the vertical direction to the polarizer.
8. A polarizer comprising:
a sapphire single crystalline layer; and
a Ca x CoO 2 crystalline layer; wherein
the Ca x CoO 2 crystalline layer is stacked on the sapphire single crystalline layer,
a surface of the Ca x CoO 2 crystalline layer has a (010) surface orientation, and
the Ca x CoO 2 crystalline layer has a thickness of not less than 2 micrometers and not more than 20 micrometers.
9. The polarizer according to claim 8 , wherein
the Ca x CoO 2 crystalline layer has a thickness of not less than 2 micrometers and not more than 9 micrometers.
10. The polarizer according to claim 8 , wherein
the Ca x CoO 2 crystalline layer has a thickness of not less than 2 micrometers and not more than 4 micrometers.