Miniaturization for Dual-Beam Super-Resolution Optical Data Storage System with Ultra-High Capacities

An achromatic metalens in the near-infrared region with an array based on a single nano-rod unit

“…With the advantages of ultra-thin thickness and easy processing, massive investigations of metasurfaces have explored various functional optical components such as lightweight coding, 1) light beam shaping, [2][3][4][5] hologram, [6][7][8][9][10][11][12][13] polarization control [14][15][16][17][18][19][20][21] and so on. [22][23][24][25][26] In 2016 Mohammadreza et al 27) developed a metalens which has a better imaging performance with a smaller FWHM than a commercial objective lens when the light is normally incident to the metalens. A pioneering work by Aieta et al in 2015 demonstrated a multiwavelength metalens by dispersive phase compensations which engineered a wavelength-dependent phase shift imparted by low-loss dielectric resonators.…”