Gallium Nitride Metalens for Image Decryption

As the demand for secure digital data continues to increase, image encryption and decryption have recently received tremendous attention. The rapid development of ultrathin metasurfaces has mainly been driven by desire introduction novel methods with which electromagnetic waves can be manipulated. a promising application metasurfaces, metalenses shown great potential replace bulky traditional optical devices. In this work, we present that images produced commercially available projector are encrypted using color superposition principle, fabricated metalens is subsequently utilized perform an incidence made white light-emitting diodes (LEDs). correct positions carefully found three distinct diode lasers as incident light sources. Recent investigations show high-performance successfully developed once suitable dielectric material chosen. consequence, our high performance composed hexagon-resonated elements (HREs) gallium nitride (GaN) capable resolving line width small 870 nm. smaller diameter 8 μm numerically simulated diffraction-limited focusing efficiency 92%. This work again shows GaN metalenses, future optics, prospects in expanding widespread applications near future.