Rewritable full-color computer-generated holograms based on color-selective diffractive optical components including phase-change materials
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Updated: Feb 4, 2026

Recording Ultra-Realistic Full-Color Analog Holograms for Use in a Moving Hologram Display
Published on: January 14, 2020
Chi-Young Hwang1, Gi Heon Kim, Jong-Heon Yang
1Reality Display Device Research Group, Electronics and Telecommunications Research Institute, Daejeon 34129, Republic of Korea. cyhwang@etri.re.kr yhakim@etri.re.kr.
Abstract:
We propose rewritable full-color computer-generated holograms (CGHs) based on color-selective diffraction using the diffractive optical component with the resonant characteristic. The structure includes an ultrathin layer of phase-change material Ge2Sb2Te5 (GST) on which a spatial binary pattern of amorphous and crystalline states can be recorded. The CGH patterns can be easily erased and rewritten by the pulsed ultraviolet laser writing technique owing to the thermally reconfigurable characteristic of GST. We experimentally demonstrate that the fabricated CGH, having a fine pixel pitch of 2 μm and a size of 32.8 × 32.8 mm2, reconstructs the three-dimensional holographic images. In addition, the feasibility of the rewritable property is verified by erasing and rewriting part of the CGH.
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