Figure 1
From: Metasurface-based broadband hologram with high tolerance to fabrication errors
Optical performance of the elongated nanoaperture.
(a) An illustration of the unit cell. The elongated aperture could rotate in the x-y plane with an orientation angle of ζ to produce a particular phase delay. The periods Px and Py are both 300 nm. The length, width and height are L = 200 nm, W = 100 nm and H = 120 nm. The thickness of the glass substrate in the experiment is 2 mm. (b) Phase and transmission efficiency in power versus the rotation angle ζ of the unit cell. The blue line and red line correspond to the phase-angle relation and transmission efficiency-angle relation, respectively. The wavelength is set with 632.8 nm. (c) Phase shift of the transmitted RCP light and (d) the transmission efficiencies of LCP and RCP light with different orientation angle ζ when the incident wavelength from 400 nm to 1000 nm, the colorful solid line and dot line correspond to the transmitted RCP and LCP light, respectively. The incident light is set with LCP light. The lines for 0 degree and 180 degrees are overlapped.
