School of Materials Science and Engineering, Shanghai University, Shanghai, China
Polarization multiplexing or polarization conversion devices based on metasurfaces have been reported in various electromagnetic frequency bands, among which graphene-based electronically controlled devices and semiconductor-based optically controlled terahertz metasurfaces have unique advantages in terms of modulation depth and speed, respectively. However, both are often mutually constrained and difficult to satisfy simultaneously in a single device. In this paper, an electric-optical dual physical field modulation scheme is proposed to achieve broadband and efficient polarization transformation using metal-graphene-germanium heterostructured metasurfaces. By varying the Fermi level of graphene and the conductivity of the semiconductor, the linear polarization conversion efficiency of the device is effectively switched in a wide range of 99%-25%, and the polarization conversion characteristics are well maintained in the incident angle of 0-50 degrees. The proposed scheme provides a new idea for the design of terahertz polarization devices, which is expected to be applied to terahertz communication and imaging.
Metasurface, Polarization conversion, Tunable
Ting Zhang. Optoelectronic Jointly Tuned Terahertz Polarization Converter Based on Graphene-Semiconductor Hybrid Metasurfaces. Academic Journal of Materials & Chemistry (2022) Vol. 3, Issue 1: 7-12. https://doi.org/10.25236/AJMC.2022.030102.
 M. Onoda, S. Murakami, and N. Nagaosa, “Hall effect of light,” Phys. Rev. Lett. 93, 083901 (2004).
 O. Hosten and P. Kwiat, “Observation of the spin Hall effect of light viaweak measurements,” Science 319, 787–790 (2008).
 W. Groner, J. W. Winkelman, A. G. Harris, C. Ince, G. J. Bouma, K. Messmer, and R. G. Nadeau, “Orthogonal polarization spectral imaging: a new method for study of the microcirculation,” Nat. Med. 5, 1209–1212 (1999).
 T. Stav, A. Faerman, E. Maguid, D. Oren, V. Kleiner, E. Hasman, and M. Segev, “Quantum entanglement of the spin and orbital angular momentum of photons using metamaterials,” Science 361, 1101–1104 (2018).
 R. C. Devlin, A. Ambrosio, N. A. Rubin, J. P. B. Mueller, and F. Capasso, “Arbitrary spin-to-orbital angular momentum conversion of light,” Science 358, 896–901 (2017).
 D. Goldstein, Polarized Light, 3rd ed. (CRC Press, 2010)
 N. Yu and F. Capasso, “Flat optics with designer metasurfaces,” Nat. Mater. 13, 139–150 (2014).
 F. Zangeneh-Nejad, D. L. Sounas, A. Alù, and R. Fleury, “Analogue computing with metamaterials,” Nat. Rev. Mater. 6, 207–225 (2021).
 Y. Zhou, H. Zheng, I. I. Kravchenko, and J. Valentine, “Flat optics for image differentiation,” Nat. Photonics 14, 1–2 (2020).
 G. Li, S. Zhang, and T. Zentgraf, “Nonlinear photonic metasurfaces,” Nat. Rev. Mater. 2, 17010 (2017).
 S. Wang, Z. Deng, Y. Wang, Q. Zhou, X. Wang, Y. Cao, B. Guan, S. Xiao, and X. Li, “Arbitrary polarization conversion dichroism metasurfaces for all-in-one full Poincaré sphere polarizers,” Light Sci. Appl. 10, 24 (2021).
 Q. Fan, M. Liu, C. Zhang, W. Zhu, Y. Wang, P. Lin, F. Yan, L. Chen, H. J. Lezec, Y. Lu, A. Agrawal, and T. Xu, “Independent amplitude control of arbitrary orthogonal states of polarization via dielectric metasurfaces,” Phys. Rev. Lett. 125, 267402 (2020).
 Y. Malevich, M. S. Ergoktas, G. Bakan, P. Steiner, and C. Kocabas, “Video-Speed Graphene Modulator Arrays for Terahertz Imaging Applications,” ACS Photonics 7(9), 2374-2380 (2020).