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This paper addresses a reflection-type dual-band 2-bit coding metasurface(CM) design to achieve the dual-band functionalities in two different operatingbands, independently. We are particularly interested to controllinearly-polarized incident waves by encoding the propagation / dynamic phasein order to realize and fully control the orbital angular momentum (OAM) vortexbeam (VB) for dual-band, independently. In this regard, we perform digitaladdition operations to combine the coding sequences of traditional OAM andphase-gradient to construct the proposed CM. The proposed CM generates andsteers the OAM-VB with different topological charges in both lower and higherbands, independently. Similarly, the proposed CM is further extended for OAM-VBshaping by combining the coding sequences of traditional OAM and splittingphase unit-cells, and, we discuss two different scenarios. Firstly, OAM-VBsplitting is performed to achieve different topological charges in both lowerand higher bands, independently. Secondly, quad-beam shaping is realized toverify the proposed concept of this paper. Finally yet importantly, we alsoexamine that the reflected beam directions can be further independentlycontrolled to achieve anomalous, negative and retro-reflection at two differentoperating bands. The proposed concept will open up possibilities ofmulti-functional meta-devices and will be useful in many applications such asoptical spanners, quantum optics, spatial mode multiplexing fortelecommunications, and astronomy etc.

Fully-control of OAM vortex beam and realization of retro and negative reflection at oblique incidence using dual-band 2-bit coding metasurface