Phase change material-based metasurface structure and related method
AssigneeCity University of Hong Kong
InventorsDangyuan Lei, Yulong Fan, Yuan Liao
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Abstract
A metasurface structure including an array of sub-wavelength structures including a phase change material (PCM), encoded with different holographic images based on different phases of the PCM, the different phases including a first phase and a second phase. Phase transition between the first phase and the second phase occurs when the metasurface structure is thermally tuned. Each sub-wavelength structure in the array has a distinctive phase difference between the first phase and the second phase of the PCM.
Claims24
A metasurface structure comprising:
- an array of sub-wavelength structures including a phase change material (PCM), encoded with different holographic images based on different phases of the PCM, the different phases including a first phase and a second phase,
- wherein phase transition between the first phase and the second phase occurs when the metasurface structure is thermally tuned, and
- wherein each sub-wavelength structure in the array has a distinctive phase difference between the first phase and the second phase of the PCM.
A method for encoding information on a metasurface structure including an array of sub-wavelength structures, comprising:
- selecting the array of sub-wavelength structures including a phase change material (PCM) such that each sub-wavelength structure in the array has a distinctive phase difference between a first phase and a second phase of the PCM;
- and
- encoding at least two different holographic images into the array of sub-wavelength structures based on the first phase and the second phase of the PCM,
- wherein the first phase and the second phase are different.
Dependencies are inferred from the claim text.