Abstract
Reflective metasurfaces based on metallic1,2,3 and dielectric4,5 nanoscatterers have attracted interest owing to their ability to control the phase of light. However, because such nanoscatterers require subwavelength features, the fabrication of elements that operate in the visible range is challenging. Here, we show that chiral liquid crystals6,7 with a self-organized helical structure enable metasurface-like, non-specular reflection in the visible region. The phase of light that is Bragg-reflected off the helical structure can be controlled over 0–2π depending on the spatial phase of the helical structure; thus planar elements with arbitrary reflected wavefronts can be created via orientation control. The circular polarization selectivity and external field tunability of Bragg reflection open a wide variety of potential applications for this family of functional devices, from optical isolators to wearable displays.
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References
Yu, N. et al. Light propagation with phase discontinuities: generalized laws of reflection and refraction. Science 334, 333–337 (2011).
Meinzer, N., Barnes, W. L. & Hooper, I. R. Plasmonic meta-atoms and metasurfaces. Nature Photon. 8, 889–898 (2014).
Kildishev, A. V., Boltasseva, A. & Shalaev, V. M. Planar photonics with metasurfaces. Science 339, 1232009 (2013).
Yu, N. & Capasso, F. Flat optics with designer metasurfaces. Nature Mater. 13, 139–150 (2014).
Fattal, D., Li, J., Peng, Z., Fiorentino, M. & Beausoleil, R. G. Flat dielectric grating reflectors with focusing abilities. Nature Photon. 4, 466–470 (2010).
Yeh, P. & Gu, C. Optics of Liquid Crystal Displays 2nd edn (Wiley, 2009).
de Vries, H. Rotatory power and other optical properties of certain liquid crystals. Acta Crystallogr. 4, 219–226 (1951).
Huang, Y., Zhou, Y., Doyle, C. & Wu, S.-T. Tuning the photonic band gap in cholesteric liquid crystals by temperature-dependent dopant solubility. Opt. Express 14, 1236–1242 (2006).
Hikmet, R. A. M. & Kemperman, H. Electrically switchable mirrors and optical components made from liquid-crystal gels. Nature 392, 476–479 (1998).
Kahn, F. J. Electric-field-induced color changes and pitch DILATION in cholesteric liquid crystals. Phys. Rev. Lett. 24, 209–212 (1970).
Brehmer, M., Lub, J. & van de Witte, P. Light-induced color change of cholesteric copolymers. Adv. Mater. 10, 1438–1441 (1998).
Berreman, D. W. Optics in stratified and anisotropic media: 4 × 4-matrix formulation. J. Opt. Soc. Am. 62, 502–510 (1972).
Honma, M. & Nose, T. Polarization-independent liquid crystal grating fabricated by microrubbing process. Jpn. J. Appl. Phys. 42, 6992–6997 (2003).
Kim, J.-H., Yoneya, M. & Yokoyama, H. Tristable nematic liquid-crystal device using micropatterned surface alignment. Nature 420, 159–162 (2002).
Chigrinov, V. G. et al. Photoalignment of Liquid Crystalline Materials: Physics and Applications (Wiley, 2008).
Ichimura, K. Photoalignment of liquid-crystal systems. Chem. Rev. 100, 1847–1874 (2000).
Nersisyan, S. R. & Tabiryan, N. V. Polarization imaging components based on patterned photoalignment. Mol. Cryst. Liq. Cryst. 489, 156–168 (2008).
Vernon, J. P. et al. Optically reconfigurable reflective/scattering states enabled with photosensitive cholesteric liquid crystal cells. Adv. Opt. Mater. 1, 84–91 (2013).
Culbreath, C., Glazar, N. & Yokoyama, H. Note: Automated maskless micro-multidomain photoalignment. Rev. Sci. Instrum. 82, 126107 (2011).
Yoshida, H., Asakura, K., Fukuda, J. & Ozaki, M. Three-dimensional positioning and control of colloidal objects utilizing engineered liquid crystalline defect networks. Nature Commun. 6, 7180 (2015).
Lee, C. H., Yoshida, H., Miura, Y., Fujii, A. & Ozaki, M. Local liquid crystal alignment on patterned micrograting structures photofabricated by two photon excitation direct laser writing. Appl. Phys. Lett. 93, 173509 (2008).
Gansel, J. K. et al. Gold helix photonic metamaterial as broadband circular polarizer. Science 325, 1513–1515 (2009).
Goodman, J. W. Introduction to Fourier Optics 3rd edn (Roberts & Company, 2005).
Gauza, S. et al. Super high birefringence isothiocyanato biphenyl-bistolane liquid crystals. Jpn. J. Appl. Phys. 43, 7634–7638 (2004).
Broer, D. J., Lub, J. & Mol, G. N. Wide-band reflective polarizers from cholesteric polymer networks with a pitch gradient. Nature 378, 467–469 (1995).
Sugita, A. et al. Numerical calculation of optical eigenmodes in cholesteric liquid crystals by 4 × 4 matrix method. Jpn. J. Appl. Phys. 21, 1543–1546 (1982).
Matsui, T., Ozaki, R., Funamoto, K., Ozaki, M. & Yoshino, K. Flexible mirrorless laser based on a free-standing film of photopolymerized cholesteric liquid crystal. Appl. Phys. Lett. 81, 3741 (2002).
Inoue, Y., Yoshida, H., Kubo, H. & Ozaki, M. Deformation-free, microsecond electro-optic tuning of liquid crystals. Adv. Opt. Mater. 1, 256–263 (2013).
McCollough, G. T., Rankin, C. M. & Weiner, M. L. Roll-to-roll manufacturing considerations for flexible, cholesteric liquid-crystal display (Ch-LCD) media. J. Soc. Info. Disp. 14, 25–30 (2006).
Acknowledgements
The authors thank R. Ozaki for discussions. The authors also thank the DIC Corporation for providing the photoalignment material, and Merck KGaA for providing the chiral dopant. This study was supported by a Grant-in-Aid for JSPS Fellows (15J00288), the MEXT Photonics Advanced Research Centre Program (Osaka University), and JST, PRESTO.
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J.K. designed the reflectors and carried out the experimental demonstrations and numerical simulations. H.Y. conceived and directed the study. M.O. supervised the study. All authors discussed the results and worked on the manuscript.
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Kobashi, J., Yoshida, H. & Ozaki, M. Planar optics with patterned chiral liquid crystals. Nature Photon 10, 389–392 (2016). https://doi.org/10.1038/nphoton.2016.66
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DOI: https://doi.org/10.1038/nphoton.2016.66
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