We have developed several strategies for modulating the infrared absorptivity and emissivity of metasurfaces via electrical control signal. These employ such approaches as voltage-induced symmetry breaking and period doubling for controlling the coupling between a guided mode of the metasurface and the continuum. We further describe potential applications in encoding and encrypting light, for development of secure tags.
We explore the possibility of communicating encrypted information using infrared metamaterials. We first describe our algorithm for encrypting a plain image in multiple cipher images, each corresponding to a different wavelength channel. Our scheme is designed so that an interloper will not be able to recover the image from the summed intensity or the individual channels. However, the intended recipient can easily reconstruct the image by performing a mathematical operation over the channels. We implement this scheme in a 4-channel infrared metamaterial and demonstrate image encryption and decryption.
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