A manufacturing method of achromatic focus metasurface

The flat lens based on mate-surface can reduce the volume of optical components further and is very potential to use in compact and integrated optics, here we proposed a kind of dielectric meta-surface which works on two wavelengths at infrared waveband and can focus light without chromatic aberration. Because the dielectric sub-wavelength resonator can make different phase shift covering 0–2π and relatively high transmission for particular resonance wavelengths, the wave-front of transmitted light can be shaped to wanted. By using FDTD method, the parameters of the resonators are optimized. Numerical simulation and experiment have largely same results, showing that, at 5μm and 10.6μm two wavelength, TE mode incident the meta-surface, transmitted light will focus on one point.