Tunable metasurfaces with liquid crystals

Intensive researches in the area of metasurfaces have provided a new insight to obtain flat and compact optical systems. In this letter, we numerically show that, highly efficient tunable beam steering effect in transmission mode is achieved at wavelength λ = 550 nm using nematic liquid crystals (LCs) infiltrated into double sided metasurfaces. Using the electrooptical feature of LCs, the phase profile of the metasurfaces is controlled and thus, the transmitted beam is deflected within the range from -15° to 15° steering angles. Transparent dielectric materials are used in the designed structure that provides highly efficient beam-steering; the corresponding transmission efficiency is above 83% in the visible spectrum, which is another superiority of the proposed hybrid tunable structure over present plasmonic/metamaterial approaches. The designed metasurface still preserves its beam deflection property covering the visible spectrum and hence, such hybrid structure can be implemented for broadband electro-optically controllable beam steering applications.

[1]  Yi-Hsin Lin,et al.  An electrically tunable-focusing liquid crystal lens with a low voltage and simple electrodes. , 2012, Optics express.

[2]  Igal Brener,et al.  Active tuning of all-dielectric metasurfaces. , 2015, ACS nano.

[3]  Wei Ting Chen,et al.  Polarization-Insensitive Metalenses at Visible Wavelengths. , 2016, Nano letters.

[4]  Yuri S. Kivshar,et al.  Electrically tunable all-dielectric optical metasurfaces based on liquid crystals , 2017 .

[5]  W. T. Chen,et al.  Metalenses at visible wavelengths: Diffraction-limited focusing and subwavelength resolution imaging , 2016, Science.

[6]  Arka Majumdar,et al.  Tunable metasurfaces via subwavelength phase shifters with uniform amplitude , 2016, Scientific Reports.

[7]  Willem L. Vos,et al.  Liquid crystal infiltration of complex dielectrics , 2003 .

[8]  M. Yoneya,et al.  Physics of Liquid Crystals , 2014 .

[9]  F. Xia,et al.  Graphene Plasmonic Metasurfaces to Steer Infrared Light , 2015, Scientific Reports.

[10]  P. Chao,et al.  A new negative liquid crystal lens with multiple ring electrodes in unequal widths , 2012, IEEE Photonics Journal.

[11]  Yuzuru Takashima,et al.  Polarization independent high transmission large numerical aperture laser beam focusing and deflection by dielectric Huygens’ metasurfaces , 2017 .

[12]  Federico Capasso,et al.  Broadband high-efficiency dielectric metasurfaces for the visible spectrum , 2016, Proceedings of the National Academy of Sciences.

[13]  Junjie Li,et al.  Dielectric Huygens’ Metasurface for High-Efficiency Hologram Operating in Transmission Mode , 2016, Scientific Reports.

[14]  Highly tunable elastic dielectric metasurface lenses , 2016 .

[15]  Tatsuo Uchida,et al.  Liquid Crystal Orientation on the Surface of Obliquely-Evaporated Silicon Monoxide with Homeotropic Surface Treatment , 1980 .

[16]  Yi-Hsin Lin,et al.  Electrically tunable-focusing and polarizer-free liquid crystal lenses for ophthalmic applications. , 2013, Optics express.

[17]  Erez Hasman,et al.  Dielectric gradient metasurface optical elements , 2014, Science.

[18]  Yuri S. Kivshar,et al.  Liquid crystal tuning of all-dielectric metasurfaces , 2015, 2015 Conference on Lasers and Electro-Optics (CLEO).

[19]  Takashi Taniguchi,et al.  Higher refractive index and lower wavelength dispersion of SiO2 glass by structural ordering evolution via densification at a higher temperature , 2016 .

[20]  Junji Watanabe,et al.  Large extraordinary refractive index in highly birefringent nematic liquid crystals of dinaphthyldiacetylene-based materials , 2013 .

[21]  Daniel Wintz,et al.  Holographic metalens for switchable focusing of surface plasmons. , 2015, Nano letters.

[22]  Andrea Alù,et al.  Manipulating light polarization with ultrathin plasmonic metasurfaces , 2011 .

[23]  Yang Cao,et al.  Highly efficient beam steering with a transparent metasurface. , 2013, Optics express.

[24]  A. Arbabi,et al.  Subwavelength-thick lenses with high numerical apertures and large efficiency based on high-contrast transmitarrays , 2014, Nature Communications.

[25]  Din Ping Tsai,et al.  Active dielectric metasurface based on phase‐change medium , 2016 .