Metasurfaces have shown many interesting physical phenomena by designing the subwavelength antennas and, thus, controlling the complex amplitude of optical waves. Practicality is one of the biggest challenges of metasurfaces because practical applications have not been realized yet, despite well-demonstrated metasurfaces such as achromatic lenses, holograms, and optical cloaks. Early metasurfaces composed of plasmonic resonators have a significant loss of optical power at visible wavelengths. Amorphous silicon, which is easy to fabricate, can overcome the optical loss only above the wavelength of 600 nm. Use of other dielectric materials such as crystalline silicon or titanium dioxide drastically increases the efficiency of the metasurfaces at whole visible wavelengths, but complex fabrication processes remain an ongoing challenge for practical applications. Here, we exploit polycrystalline silicon to achieve both fabrication compatibility and hologram functionality at the wavelength of 532 nm. Polarization-independent meta hologram is experimentally demonstrated to verify our approach, and our device shows the highest efficiency compared to other reported meta holograms that do not need complicated fabrication processes. We believe that our approach can provide a useful perspective on practicality improvement of metasurfaces.

中文翻译：

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可见光波长下的实用形表面全息图：衍射效率和制造兼容性之间的平衡。

通过设计亚波长天线，从而控制光波的复振幅，超表面已经显示出许多有趣的物理现象。实用性是超颖表面的最大挑战之一，因为尽管消消色差透镜，全息图和光学隐身衣等经过充分证明的超颖表面已得到实际应用，但尚未实现实际应用。由等离子共振器组成的早期超颖表面在可见光波长处的光功率显着损失。易于制造的非晶硅只能克服波长大于600 nm的光损耗。使用其他介电材料（例如晶体硅或二氧化钛）会大大提高整个可见光波长下超颖表面的效率，但是复杂的制造工艺对于实际应用仍然是一个持续的挑战。在这里，我们利用多晶硅在532 nm波长下实现制造兼容性和全息功能。实验证明了偏振无关的全息图可以验证我们的方法，并且与其他不需要复杂制造工艺的报道的全息图相比，我们的设备显示出最高的效率。我们相信，我们的方法可以为改进超颖表面的实用性提供有用的观点。与其他不需要复杂制造工艺的报道的全息图相比，我们的设备显示出最高的效率。我们相信，我们的方法可以为改进超颖表面的实用性提供有用的观点。与其他不需要复杂制造工艺的报道的全息图相比，我们的设备显示出最高的效率。我们相信，我们的方法可以为改进超颖表面的实用性提供有用的观点。