
1.Center for Terahertz Waves and College of Precision Instrument and Optoelectronics Engineering, Tianjin University and the Key Laboratory of Optoelectronics Information and Technology (Ministry of Education), Tianjin 300072, China
2.Optoelectronics Research Centre and Centre for Photonic Metamaterials, University of Southampton, Highfield, Southampton SO17 1BJ, UK
3.School of Electrical and Computer Engineering, Oklahoma State University, Stillwater, OK 74078, USA
Eric Plum (erp@orc.soton.ac.uk)
Jiaguang Han (jiaghan@tju.edu.cn)
Published:2018,
Published Online:27 June 2018,
Received:16 November 2017,
Revised:09 April 2018,
Accepted:11 April 2018
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Wang, Q. et al. Reflective chiral meta-holography: multiplexing holograms for circularly polarized waves. Light: Science & Applications, 4, 219-227 (2018).
Wang, Q. et al. Reflective chiral meta-holography: multiplexing holograms for circularly polarized waves. Light: Science & Applications, 4, 219-227 (2018). DOI: 10.1038/s41377-018-0019-8.
By allowing almost arbitrary distributions of amplitude and phase of electromagnetic waves to be generated by a layer of sub-wavelength-size unit cells
metasurfaces have given rise to the field of meta-holography. However
holography with circularly polarized waves remains complicated as the achiral building blocks of existing meta-holograms inevitably contribute to holographic images generated by both left-handed and right-handed waves. Here we demonstrate how planar chirality enables the fully independent realization of high-efficiency meta-holograms for one circular polarization or the other. Such circular-polarization-selective meta-holograms are based on chiral building blocks that reflect either left-handed or right-handed circularly polarized waves with an orientation-dependent phase. Using terahertz waves
we experimentally demonstrate that this allows the straightforward design of reflective phase meta-holograms
where the use of alternating structures of opposite handedness yields independent holographic images for circularly polarized waves of opposite handedness with negligible polarization cross-talk.
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