Abstract
With new degrees of freedom to achieve full control of the optical wavefront, metasurfaces could overcome the fabrication embarrassment faced by the metamaterials. In this paper, a broadband hologram using metasurface consisting of elongated nanoapertures array with different orientations has been experimentally demonstrated. Owing to broadband characteristic of the polarization-dependent scattering, the performance is verified at working wavelength ranging from 405 nm to 914 nm. Furthermore, the tolerance to the fabrication errors, which include the length and width of the elongated aperture, the shape deformation and the phase noise, has been theoretically investigated to be as large as 10% relative to the original hologram. We believe the method proposed here is promising in emerging applications such as holographic display, optical information processing and lithography technology etc.
Highlights
632.8 nm. (c) Phase shift of the transmitted right-handed circular polarization (RCP) light and (d) the transmission efficiencies of left-handed circular polarization (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 left-handed circular polarization (LCP) plane wave is used as input light both in the simulation and experiment
Since the phase is about twice of the orientation angle of the nano-aperture, so the phase could be modulated from 0–360 degrees
Summary
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. (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. Structure, the fabrication tolerance could be as high as 10% relative to the original designed phase hologram. The elongated aperture, which can be processed conveniently by the focused ion beam (FIB), is used to demonstrate the broadband and high tolerance feature. This design holds promise for practical systems of holographic display as the working wavelength range of the configuration covers the whole visible light region
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