研究目的
To demonstrate a 3D-integrated metasurface device for achieving low-crosstalk, polarisation-independent, high-efficiency, full-colour holography, and microprint, outlining a novel scheme for data recording, security encryption, colour displays, and information processing.
研究成果
The 3D-integrated metasurface device demonstrated the advantages of low crosstalk, high efficiency, and polarisation independence for full-colour holography. The concept of 3D integration can be extended to achieve more complicated functions by including a variety of functional metasurface layers, demonstrating the great application potential of metasurfaces in multi-functional on-chip optoelectronic devices.
研究不足
The crosstalk in the experiment was larger than the theoretical prediction due to fabrication inaccuracy. The diffraction efficiency could be further improved by using higher structures and materials with a larger refractive index.
1：Experimental Design and Method Selection:
The device was designed by stacking a hologram metasurface on a monolithic Fabry–Pérot cavity-based colour filter microarray. The design rationale was to utilize the ultrathin and compact characteristics of metasurfaces for multi-tasking applications.
2：Sample Selection and Data Sources:
The samples were fabricated using electron-beam lithography (EBL) and metal evaporation processes. The colour filter microarray was specifically arranged to form a colour microprint under white-light illumination.
3：List of Experimental Equipment and Materials:
The fabrication involved a 30-kV EBL system, thermal evaporation for silver layer deposition, and spin-coating for resist layers. Materials included polymethyl methacrylate (PMMA), hydrogen silsesquioxane (HSQ), and silver.
4：Experimental Procedures and Operational Workflow:
The fabrication process included two EBL processes for the colour filter microarray and hologram metasurface, followed by metal evaporation and lift-off processes. Optical characterisation was performed using an optical microscope and laser diodes for hologram projection.
5：Data Analysis Methods:
The performance of the device was analysed based on transmission efficiency, crosstalk, and diffraction efficiency. The hologram images were captured and compared with simulations to evaluate the device's performance.
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