Space-variant polarization manipulation of thermal emission
View Patent ↗A method for Space-variant polarization manipulation of enhanced nondirectional thermal emission in a narrow spectral peak is disclosed, comprising providing a subwavelength grating irradiating non-directional thermal emission on the grating and discretely controlling the local orientation of the grating.
1. A method for space-variant manipulating of thermal emission from a surface of a material that supports surface waves, the method comprising:
providing on the surface of the material a grating with a spatially varying grating parameter for optical encryption of information; and
imaging the thermal emission.
2. The method of claim 1 , wherein the grating parameter is selected from the group of grating parameters consisting of grating orientation, grating period, grating fill factor and grating depth.
3. The method of claim 1 , further comprising decrypting the imaged thermal emission.
4. The method of claim 1 , wherein the grating with a spatially varying grating parameter is designed with a key function.
5. The method of claim 4 , further comprising decrypting the imaged thermal emission based on the key function.
6. The method of claim 1 , wherein the spatially varying grating parameter varies discretely.
7. A method for optical encryption of information, the method comprising providing a grating with a spatially varying grating parameter on a surface of a material that supports surface waves, wherein the spatially varying grating parameter is designed to so as to include optically encrypted information.
8. The method of claim 7 , wherein the grating parameter is selected from the group of grating parameters consisting of grating orientation, grating period, grating fill factor and grating depth.
9. The method of claim 7 , further comprising imaging the thermal emission and decrypting the optically encrypted information from the imaged thermal emission.
10. The method of claim 7 , wherein the grating with a spatially varying grating parameter is designed with a key function.
11. The method of claim 10 , further comprising imaging the thermal emission and decrypting the optically encrypted information from the imaged thermal emission based on the key function.
12. The method of claim 7 , wherein the spatially varying grating parameter on the surface of the material varies discretely.