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.
Claims23
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 between different temperatures, 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, and
- wherein the different holographic images comprise a first holographic image displayed in the first phase at a first temperature and a second holographic image displayed in the second phase at a second temperature.
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, and phase transition between the first phase and the second phase occurs when the metasurface structure is thermally tuned between different temperatures,
- wherein the at least two different holographic images comprise a first holographic image displayed in the first phase at a first temperature and a second holographic image displayed in the second phase at a second temperature.
Dependencies are inferred from the claim text.