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Broadband plasmonic detour phase meta-holograms with full parameter control of light (Conference Presentation)

As a powerful and compact device for manipulating wavefront of light, metasurface has widely been studied in recent years. However, simultaneous control of full parameters of light (including amplitude, phase, and polarization) over a wide bandwidth is still a great challenge. In our works, we demonstrate that the combination of subwavelength plasmonic structures and detour phase could achieve full parameter control of light. Here, the traditional detour phase is used to manipulate the phase of light, while several different plasmonic structures are designed to control the amplitude and various polarization state distributions. We first introduce a type of detour phase meta-hologram composed of cross-shaped plasmonic nano-silt array which are sensitive to linear polarization with over 1000-nm bandwidth from visible to near-infrared. In a proof-of-concept experiment, we demonstrate 3D object reconstruction and polarization multiplexing images at various prescribed wavelengths from 473 nm to 1550 nm using a specially designed meta-hologram. Then we introduce another design of detour phase meta-hologram which is sensitive to circular polarizations. We choose a pair of oblique plasmonic nano-slits as a unit cell in the hologram, and modulate its polarization response by changing the distance between the two slits in a unit cell. We demonstrate that such design can be used for detecting both topological charge and polarization order of vortex vector beam, or generating holographic patterns with RGB colors. Beneﬁting from high controllability of amplitude, phase, and polarization, our meta-holograms offer great potential in future applications such as 3D displays, optical communications, and beam shaping.