Liquid crystal based tunable terahertz metadevices
), Yanqing Lub()Graphical Abstract
Abstract
Metasurface significantly enriches the light-matter interaction and promotes the development of planar optics. In recent years, with the rapid advancements of terahertz (THz) technology, THz devices with switchable and reconfigurable functions have been intensively pursued. Liquid crystal (LC), a unique soft matter that combines the fluidity of liquids and the order of crystals, is now indispensable in displays and spatial light modulations. LC is integrated with metasurfaces to realize dynamic THz devices and apparatuses as well. This review summarizes the research progress in LC based THz metadevices in three different respects: LC planar THz devices, LC integrated metal metasurfaces, and LC integrated dielectric metasurfaces. Various technologies for fabrications of LC microstructures and integrations of LCs with metal or dielectric metasurfaces are presented. The obtained LC metadevices exhibit excellent responsiveness to external stimulus such as electric fields, magnetic fields, heat, and light. By this means, the amplitude, frequency, phase as well as polarization of THz waves are dynamically manipulated. The LC based tunable THz metadevices will significantly improve THz applications in imaging, communication, and sensing.
References
Zhou J, Liu SG. Research progress of terahertz biomedical applications. Modern Applied Physics 2014;5:85-97.
Yao J, Chi N, Yang P, Cui H, Wang J, Li J, et al. Study and Outlook of terahertz communication technology. Chin J Lasers 2009;36:2213-33.
Tonouchi M. Cutting-edge terahertz technology. Nat Photonics 2007;1:97-105.
Ferguson B, Zhang XC. Materials for terahertz science and technology. Nat Mater 2002;1:26-33.
Pendry JB, Holden AJ, Stewart WJ, Youngs I. Extremely low frequency plasmons in metallic mesostructures. Phys Rev Lett 1996;76:4773-6.
Yu NF, Genevet P, Kats MA, Aieta F, Tetienne JP, Capasso F, et al. Light propagation with phase Discontinuities: Generalized Laws of reflection and refraction. Science 2011;334:333-7.
Khorasaninejad M, Chen WT, Devlin RC, Oh J, Zhu AY, Capasso F. Metalenses at visible wavelengths: diffraction-limited focusing and subwavelength resolution imaging. Science 2016;352:1190-4.
Xiong J, Wu ST. Planar liquid crystal polarization optics for augmented reality and virtual reality: from fundamentals to applications. eLight 2021;1:3.
Ma LL, Li CY, Pan JT, Ji YE, Jiang C, Zheng R, et al. Self-assembled liquid crystal architectures for soft matter photonics. Light Sci Appl 2022;11:270.
Maune H, Jost M, Reese R, Polat E, Nickel M, Jakoby R. Microwave liquid crystal technology. Crystals 2018;8:355.
Fan YH, Lin YH, Ren HW, Gauza S, Wu ST. Fast-response and scattering-free polymer network liquid crystals for infrared light modulators. Appl Phys Lett 2004;84:1233-5.
Zhu L, Xu CT, Chen P, Zhang YH, Liu SJ, Chen QM, et al. Pancharatnam-Berry phase reversal via opposite-chirality-coexisted superstructures. Light Sci Appl 2022;11:135.
Chen P, Wei BY, Hu W, Lu YQ. Liquid-crystal-mediated geometric phase: from transmissive to broadband reflective planar optics. Adv Mater 2020;32:1903665.
Tsai TR, Chen CY, Pan CL, Pan RP, Zhang XC. Terahertz time-domain spectroscopy studies of the optical constants of the nematic liquid crystal 5CB. Appl Opt 2003;42:2372-6.
Yang CS, Lin CJ, Pan RP, Que CT, Yamamoto K, Tani M, et al. The complex refractive indices of the liquid crystal mixture E7 in the terahertz frequency range. J Opt Soc Am B 2010;27:1866-73.
Vieweg N, Shakfa MK, Koch M. BL037: a nematic mixture with high terahertz birefringence. Opt Commun 2011;284:1887-9.
Ku CP, Shih CC, Lin CJ, Pan RP, Pan CL. THz optical constants of the liquid crystal MDA-00-3461. Mol Cryst Liq Cryst 2011;541:303-8.
Wang L, Lin XW, Liang X, Wu JB, Hu W, Zheng ZG, et al. Large birefringence liquid crystal material in terahertz range. Opt Mater Express 2012;2:1314-9.
Chodorow U, Mavrona E, Palka N, Strzezysz O, Garbat K, Saitzek S, et al. Terahertz properties of liquid crystals doped with ferroelectric BaTiO3 nanoparticles. Liq Cryst 2017;44:1207-15.
Reuter M, Vieweg N, Fischer BM, Mikulicz M, Koch M, Garbat K, et al. Highly birefringent, low-loss liquid crystals for terahertz applications. Apl Mater 2013;1:12107.
Dziaduszek J, Dabrowski R, Urban S, Garbat K, Glushchenko A, Czupryíski K. Selected fluorosubstituted phenyltolanes with a terminal group: NCS, CN, F, OCF3 and their mesogenic and dielectric properties and use for the formulation of high birefringence nematic mixtures to GHz and THz applications. Liq Cryst 2017;44:1277.
Yamaguchi R. Physical properties of hydrogen bonded nematic liquid crystals and electro-optical properties in terahertz waves Invited. Opt Mater Express 2023;13:2147-57.
Chodorow U, Parka J, Kula P, Herman J, Chojnowska O, Dabrowski R, et al. Terahertz properties of fluorinated liquid crystals. Liq Cryst 2013;40:1586-90.
Wang CT, Wu CL, Zhang HW, Lin TH, Lee CK. Polarization-independent 2 pi phase modulation for terahertz using chiral nematic liquid crystals. Opt Mater Express 2016;6:2283-90.
Yu JP, Chen S, Fan F, Cheng JR, Xu ST, Wang XH, et al. Tunable terahertz wave-plate based on dualfrequency liquid crystal controlled by alternating electric field. Opt Express 2018;26:663-73.
Meng QH, Wang XY, Zhang BY, Qian SY, Peng B, Zhou HY, et al. Magnetic induced terahertz modulation characteristics based on ferromagnetic nematic liquid crystals. Spectrochim Acta 2023;289:122232.
Wu H, Hu W, Hu HC, Lin XW, Zhu G, Choi JW, et al. Arbitrary photo-patterning in liquid crystal alignments using DMD based lithography system. Opt Express 2012;20:16684-9.
Xiong JH, Zhong HZ, Cheng DW, Wu ST, Wang YT. Full degree-of-freedom polarization hologram by freeform exposure and inkjet printing. Photonix 2023;4:35.
Shen ZX, Zhou SH, Ge SJ, Duan W, Ma LL, Lu YQ, et al. Liquid crystal tunable terahertz lens with spin-selected focusing property. Opt Express 2019;27:8800-7.
Ge SJ, Chen P, Shen ZX, Sun WF, Wang XK, Hu W, et al. Terahertz vortex beam generator based on a photopatterned large birefringence liquid crystal. Opt Express 2017;25:12349-56.
Ge SJ, Shen ZX, Chen P, Liang X, Wang XK, Hu W, et al. Generating, separating and polarizing terahertz vortex beams via liquid crystals with gradient-Rotation directors. Crystals 2017;7:314.
Shen YC, Shen ZX, Zhao GZ, Hu W. Photopatterned liquid crystal mediated terahertz Bessel vortex beam generator Invited. Chin Opt Lett 2020;18:080003.
Shen ZX, Tang MJ, Chen P, Zhou SH, Ge SJ, Duan W, et al. Planar terahertz photonics mediated by liquid crystal polymers. Adv Opt Mater 2020;8:1902124.
Chen CY, Hsieh CF, Lin YF, Pan RP, Pan CL. Magnetically tunable room-temperature 2π liquid crystal terahertz phase shifter. Opt Express 2004;12:2625-30.
Yang L, Fan F, Chen M, Zhang X, Bai J, Chang S. Magnetically induced birefringence of randomly aligned liquid crystals in the terahertz regime under a weak magnetic field. Opt Mater Express 2016;6:2803-11.
Ji YY, Fan F, Xu ST, Yu JP, Chang SJ. Manipulation enhancement of terahertz liquid crystal phase shifter magnetically induced by ferromagnetic nanoparticles. Nanoscale 2019;11:4933-41.
Ji YY, Fan F, Zhang X, Cheng JR, Chang SJ. Terahertz birefringence anisotropy and relaxation effects in polymer-dispersed liquid crystal doped with gold nanoparticles. Opt Express 2020;28:17253-65.
Ge SJ, Liu JC, Chen P, Hu W, Lu YQ. Tunable terahertz filter based on alternative liquid crystal layers and metallic slats. Chin Opt Lett 2015;13:120401.
Zhang X, Fan F, Ji YY, Chang SJ. Temperature-dependent chirality of cholesteric liquid crystal for terahertz waves. Opt Lett 2020;45:4988-91.
Tsai TR, Chen CY, Pan RP, Pan CL, Zhang XC. Electrically controlled room temperature terahertz phase shifter with liquid crystal. IEEE Microw Wirel Compon Lett 2004;14:77-9.
Hsieh CF, Pan RP, Tang TT, Chen HL, Pan CL. Voltage-controlled liquid-crystal terahertz phase shifter and quarter-wave plate. Opt Lett 2006;31:1112-4.
Wu HY, Hsieh CF, Tang TT, Pan RP, Pan CL. Electrically tunable room-temperature 2/spl pi/liquid crystal terahertz phase shifter. IEEE Photon Technol Lett 2006;18:1488-90.
Du Y, Tian H, Cui X, Wang XJ, Lu JG, Zhou ZX. Super terahertz transparent electrodes. Opt Express 2016;24:6359-66.
Du Y, Tian H, Cui X, Wang H, Zhou ZX. Electrically tunable liquid crystal terahertz phase shifter driven by transparent polymer electrodes. J Mater Chem C 2016;4:4138-42.
Wu Y, Ruan X, Chen CH, Shin YJ, Lee Y, Niu J, et al. Graphene/liquid crystal based terahertz phase shifters. Opt Express 2013;21:21395-402.
Wang L, Lin XW, Hu W, Shao GH, Chen P, Liang LJ, et al. Broadband tunable liquid crystal terahertz waveplates driven with porous graphene electrodes. Light Sci 2015;4:e253.
Yang CS, Tang TT, Chen PH, Pan RP, Yu PS, Pan CL. Voltage-controlled liquid-crystal terahertz phase shifter with indium-tin-oxide nanowhiskers as transparent electrodes. Opt Lett 2014;39:2511-3.
Borshch V, Shiyanovskii SV, Lavrentovich OD. Nanosecond electro-optic switching of a liquid crystal. Phys Rev Lett 2013;111:107802.
Sasaki T, Okuyama H, Sakamoto M, Noda K, Okamoto H, Kawatsuki N, et al. Twisted nematic liquid crystal cells with rubbed poly(3,4-ethylenedioxythiophene)/poly(styrenesulfonate) films for active polarization control of terahertz waves. J Appl Phys 2017;121:143106.
Ji YY, Fan F, Zhang ZY, Cheng JR, Chang SJ. Active terahertz liquid crystal device with carbon nanotube film as both alignment layer and transparent electrodes. Carbon 2022;190:376-83.
Sahoo AK, Lin YH, Yang CS, Wada O, Yen CL, Pan CL. Electrically tunable dual-layer twisted nematic liquid crystal THz phase shifters with intermediate composite polymer thin film. Opt Mater Express 2022;12:4733-54.
Wang L, Ge SJ, Hu W, Nakajima M, Lu YQ. Tunable reflective liquid crystal terahertz waveplates. Opt Mater Express 2017;7:2023-9.
Shih YH, Lin XY, Silalahi HM, Lee CR, Huang CY. Optically tunable terahertz metasurfaces using liquid crystal cells coated with photoalignment layers. Crystals 2021;11:1100.
Shih YH, Silalahi HM, Tsai TI, Chen YC, Su JY, Lee CR, et al. Optically tunable and thermally erasable terahertz intensity modulators using dye-doped liquid crystal cells with metasurfaces. Crystals 2021;11:1580.
Ji YY, Jiang XH, Fan F, Zhao HJ, Cheng JR, Wang XH, et al. Active terahertz beam deflection based on a phase gradient metasurface with liquid crystal-enhanced cavity mode conversion. Opt Express 2023;31:1269-81.
Chiang WF, Silalahi HM, Chiang YC, Hsu MC, Zhang YS, Liu JH, et al. Continuously tunable intensity modulators with large switching contrasts using liquid crystal elastomer films that are deposited with terahertz metamaterials. Opt Express 2020;28:27676-87.
Zhuang XL, Zhang W, Wang KM, Gu YF, An YW, Zhang XQ, et al. Active terahertz beam steering based on mechanical deformation of liquid crystal elastomer metasurface. Light Sci Appl 2023;12:14.
Xu S, Fan F, Cao HZ, Wang YH, Chang SJ. Liquid crystal integrated metamaterial for multi-band terahertz linear polarization conversion. Chin Opt Lett 2021;19:093701.
Ji YY, Fan F, Zhang ZY, Tan ZY, Zhang X, Yuan YW, et al. Active terahertz spin state and optical chirality in liquid crystal chiral metasurface. Phys Rev Mater 2021;5:085201.
Vasić B, Isic G, Beccherelli R, Zografopoulos DC. Tunable beam steering at terahertz frequencies using reconfigurable metasurfaces coupled with liquid crystals. IEEE J Sel Top Quantum Electron 2020;26:1-9.
Shrekenhamer D, Chen WC, Padilla WJ. Liquid crystal tunable metamaterial absorber. Phys Rev Lett 2013;110:177403.
Isić G, Vasić B, Zografopoulos DC, Beccherelli R, Gajić R. Electrically tunable critically coupled terahertz metamaterial absorber based on nematic liquid crystals. Phys Rev Appl 2015;3:064007.
Yang L, Fan F, Chen M, Zhang XZ, Chang SJ. Active terahertz metamaterials based on liquid-crystal induced transparency and absorption. Opt Commun 2017;382:42.
Vasić B, Zografopoulos DC, Isic G, Beccherelli R, Gajic R. Electrically tunable terahertz polarization converter based on overcoupled metal-isolator-metal metamaterials infiltrated with liquid crystals. Nanotechnology 2017;28:124002.
Wang J, Tian H, Wang Y, Li X, Cao Y, Li L, et al. Liquid crystal terahertz modulator with plasmon-induced transparency metamaterial. Opt Express 2018;26:5769-76.
Yin ZP, Lu YJ, Xia TY, Lai WE, Yang J, Lu HB, et al. Electrically tunable terahertz dual-band metamaterial absorber based on a liquid crystal. RSC Adv 2018;8:4197-203.
Wang L, Ge SJ, Chen ZX, Hu W, Lu YQ. Bridging the terahertz near-field and far-field observations of liquid crystal based metamaterial absorbers. Chin Phys B 2016;25:094222.
Beddoes B, Perivolari E, Kaczmarek M, Apostolopoulos V, Fedotov VA. All-optical switching of liquid crystals at terahertz frequencies enabled by metamaterials. Opt Express 2023;31:18336-45.
Yang J, Xia TY, Jing SC, Deng GS, Lu HB, Fang Y, et al. Electrically tunable reflective terahertz phase shifter based on liquid crystal. Infrared Milli Terahertz Waves 2018;39:439.
Wang L, Ge SJ, Hu W, Nakajima M, Lu YQ. Graphene-assisted high-efficiency liquid crystal tunable terahertz metamaterial absorber. Opt Express 2017;25:23873-9.
Shen ZX, Zhou SH, Ge SJ, Hu W, Lu YQ. Liquid crystal enabled dynamic cloaking of terahertz Fano resonators. Appl Phys Lett 2019;114:041106.
Shen ZX, Zhou SH, Ge SJ, Duan W, Chen P, Wang L, et al. Liquid-crystal-integrated metadevice: towards active multifunctional terahertz wave manipulations. Opt Lett 2018;43:4695-8.
Yin ZP, Wan CF, Deng GS, Zheng AD, Wang P, Yang Y, et al. Fast-tunable terahertz metamaterial absorber based on polymer network liquid crystal. Appl Sci 2018;8:2454.
Chen CC, Chiang WF, Tsai MC, Jiang SA, Chang TH, Wang SH, et al. Continuously tunable and fast-response terahertz metamaterials using in-plane-switching dual-frequency liquid crystal cells. Opt Lett 2015;40:2021-4.
Deng GS, Mo HS, Kou ZF, Yang J, Yin ZP, Li Y, et al. A polyimide-free configuration for tunable terahertz liquid-crystal-based metasurface with fast response time. Opt Laser Technol 2023;161:109127.
Gerardo PP, Mariano B, José AE, Robert C, Raymond D, Paul B, et al. Design and demonstration of an electronically scanned reflectarray antenna at 100 GHz using multiresonant cells based on liquid crystals. IEEE Trans Antennas Propag 2015;63:3722-7.
Tao SN, Shen ZX, Yu HG, Wang HC, Ge SJ, Hu W. Transflective spatial terahertz wave modulator. Opt Lett 2022;47:1650-3.
Wu JB, Shen ZX, Ge SJ, Chen BW, Shen ZX, Wang TF, et al. Liquid crystal programmable metasurface for terahertz beam steering. Appl Phys Lett 2020;116:131104.
Li WL, Hu XM, Wu JB, Fan KB, Chen BW, Zhang CH, et al. Dual-color terahertz spatial light modulator for single-pixel imaging. Light Sci Appl 2022;11:191.
Fu X, Shi L, Yang J, Fu Y, Liu C, Wu JW, et al. Flexible terahertz beam manipulations based on liquid-crystal-integrated programmable metasurfaces. ACS Appl Mater Interfaces 2022;14:22287-94.
Liu CX, Yang F, Fu XJ, Wu JW, Zhang L, Yang J, et al. Programmable manipulations of terahertz beams by transmissive digital coding metasurfaces based on liquid crystals. Adv Opt Mater 2021;9:2100932.
Buchnev O, Podoliak N, Kaltenecker K, Walther M, Fedotov VA. Metasurface-based optical liquid crystal cell as an Ultrathin spatial phase modulator for THz applications. ACS Photonics 2020;7:3199-206.
Li WL, Chen BW, Hu XY, Guo HB, Wang S, Wu JB, et al. Modulo-addition operation enables terahertz programmable metasurface for high-resolution two-dimensional beam steering. Sci Adv 2023;9:eadi7565.
Li SQ, Xu XW, Veetil RM, Valuckas V, Paniagua-Domínguez R, Kuznetsov AI. Phase-only transmissive spatial light modulator based on tunable dielectric metasurface. Science 2019;364:1087-90.
Sautter J, Staude I, Decker M, Rusak E, Neshev DN, Brener I, et al. Active tuning of all dielectric metasurfaces. ACS Nano 2015;9:4308-15.
Gao S, Xu JC, Cao JQ, Yao HM, Ali SE, Abo-Dief HM, et al. Highly efficient tunable terahertz all-dielectric metasurface absorber based on high mode. Adv Compos Hybrid Ma 2023;6:116.
Lin CJ, Li YT, Hsieh CF, Pan RP, Pan CL. Manipulating terahertz wave by a magnetically tunable liquid crystal phase grating. Opt Express 2008;16:2995-3001.
Zhao HJ, Fan F, Ji YY, Jiang SL, Tan ZY, Chang SJ. Active terahertz beam manipulation with photonic spin conversion based on a liquid crystal Pancharatnam-Berry metadevice. Photonics Res 2022;10:2658-66.
Fan F, Zhao HJ, Ji YY, Jiang SL, Tan ZY, Cheng JR, et al. Spin-decoupled beam steering with active optical chirality based on terahertz liquid crystal chiral metadevice. Adv Mater Interfaces 2023;10:2202103.
Zhao HJ, Liu JY, Jiang SL, Jiang XH, Cheng JR, Ji YY, et al. Broadband large-angle beam scanning with dynamic spin energy distribution based on liquid crystal cascaded bilayer metasurface. Nanophotonics 2023;12:3945-54.
Zhang X, Fan F, Zhang CY, Ji YY, Wang XH, Chang SJ. Tunable terahertz phase shifter based on dielectric artificial birefringence grating filled with polymer dispersed liquid crystal. Opt Mater Express 2020;10:282-92.
Zhou SH, Shen ZX, Li XN, Ge SJ, Lu YQ, Hu W. Liquid crystal integrated metalens with dynamic focusing property. Opt Lett 2020;45:4324-7.
Shen ZX, Zhou SH, Li XA, Ge SJ, Chen P, Hu W, et al. Liquid crystal integrated metalens with tunable chromatic aberration. Adv Photon 2020;2:036002.
Ji YY, Fan F, Chen M, Yang L, Chang SJ. Terahertz artificial birefringence and tunable phase shifter based on dielectric metasurface with compound lattice. Opt Express 2017;25:11405-13.
Zhao HJ, Fan F, Zhang TR, Ji YY, Chang SJ. Dynamic terahertz anisotropy and chirality enhancement in liquid-crystal anisotropic dielectric metasurfaces. Photonics Res 2022;10:1097-106.
Ji YY, Fan F, Zhang X, Cheng JR, Chang SJ. Active terahertz anisotropy and dispersion engineering based on dual-frequency liquid crystal and dielectric metasurface. J Light Technol 2020;38:4030-6.
Qiu HS, Wang L, Shen ZX, Kato K, Sarukura N, Yoshimura M, et al. Magnetically and electrically polarization-tunable THz emitter with integrated ferromagnetic heterostructure and large-birefringence liquid crystal. Appl Phys Express 2018;11:092101.
Sun Y, Xu Y, Li H, Liu Y, Zhang F, Cheng H, et al. Flexible control of broadband polarization in a spintronic terahertz emitter integrated with liquid crystal and metasurface. ACS Appl Mater Interfaces 2022;14:32646-56.
Ako RT, Upadhyay A, Withayachumnankul W, Bhaskaran M, Sriram S. Dielectrics for terahertz metasurfaces: material selection and fabrication techniques. Adv Opt Mater 2020;8:1900750.
Molesky S, Lin Z, Piggott AY, Jin WL, Vuckovic J, Rodriguez AW. Inverse design in nanophotonics. Nat Photonics 2018;12:659-70.
Chen X, Korblova E, Dong DP, Wei XY, Shao RF, Radzihovsky L, et al. First -principles experimental demonstration of ferroelectricity in a thermotropic nematic liquid crystal: Polar domains and striking electro-optics. Proc Natl Acad Sci USA 2020;117:14021-31.
Li JX, Nishikawa H, Kougo J, Zhou JC, Dai SQ, Tang WT, et al. Development of ferroelectric nematic fluids with giant-ε dielectricity and nonlinear optical properties. Sci Adv 2021;7:eabf5047.
Lin J, Peng ZW, Liu YY, Ruiz-Zepeda F, Ye RQ, Samuel ELG, et al. Laser-induced porous graphene films from commercial polymers. Nat Commun 2014;5:5714.
Zhang RX, Zong GW, Wu SY, Song RQ, Zhang X, Ge SJ, et al. Ultrathin flexible terahertz metamaterial bandstop filter based on laser-induced graphene. J Opt Soc Am B 2022;39:1229-32.
Wang JY, Xia SQ, Wang RD, Ma RB, Lu Y, Zhang XZ, et al. Topologically tuned terahertz confinement in a nonlinear photonic chip. Light Sci Appl 2023;11(1):152.
Kumar A, Gupta M, Pitchappa P, Tan YJ, Wang N, Singh R. Topological sensor on a silicon chip. Appl Phys Lett 2022;121:011101.
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