Abstract
Abstract Metasurfaces have received enormous attention thanks to their unique ability to modulate electromagnetic properties of light in various frequency regimes. Recently, exploiting its fabrication ease and modulation strength, unprecedented and unique controlling of light that surpasses conventional optical devices has been suggested and studied a lot. Here, in this paper, we discuss some parts of this trend including holography, imaging application, dispersion control, and multiplexing, mostly operating for optical frequency regime. Finally, we will outlook the future of the devices with recent applications of these metasurfaces.
Highlights
Metasurfaces have received enormous attention thanks to their unique ability to modulate electromagnetic properties of light in various frequency regimes
The scale of metaatoms should be smaller than the operational wavelength, so that the early researches on metamaterials or metasurfaces were performed in microwave range, which has a wavelength in centimeter scale [11, 15, 16]
In the case of a metahologram, which indicates the holography produced by a metasurface, the problems regarding large pixel pitch vanish thanks to its subwavelength periodic length
Summary
Holography, in its broadest sense, refers to the optical technique of controlling the wavefront of light as desired by spatially varied change of phase and amplitude [45, 46]. In the case of a metahologram, which indicates the holography produced by a metasurface, the problems regarding large pixel pitch vanish thanks to its subwavelength periodic length. This is because each meta-atom contains information of the phase or amplitude of light [1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20]. We discuss how light reacts with meta-atoms and review some of the representative metahologram studies together
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