Terahertz Linear to Circular Polarization Converter Based on Reflective Metasurface

Document Type : Article

Authors

1 Centre of Excellence in Electromagnetics, Optical Communication Lab, Faculty of Electrical Engineering, K. N. Toosi University of Technology, Tehran, Iran

2 Faculty of Electrical Engineering, K. N. Toosi University of Technology, Tehran, Iran

3 Electronic Materials Laboratory, Faculty of Electrical Engineering, K. N. Toosi University of Technology, Tehran, Iran

Abstract

Metasurfaces are two-dimensional artificial structures which have extraordinary electromagnetic properties. They have been used in myriad of devices such as nano-antennas, cloaking coatings, imaging devices, flat lenses, and polarization converters over a wide range of frequency. Due to high dependency of many devices on incident wave polarization, manipulating the polarization of electromagnetic waves would be useful, especially in the THz regime. In this study, we propose a linear to circular polarization converter (LTC-PC) based on a THz reflective metasurface. For a TE linear polarization incident wave, this structure has two distinct bands; the first one lays in a wideband frequency range of 0.5-1.41 THz, in which the reflected wave would be a left-handed circular polarization (LHCP) with minimum efficiency of 89% and maximum efficiency of more than 95% in 80% of the bandwidth. The second band lays in the narrowband frequency range of 1.45-1.55 THz, resulting a right-handed circular polarization (RHCP) wave with a minimum efficiency of 82%. The proposed polarization converter can be used in optical communication and electronic devices.

Keywords


  1. 1.      References

    1. Chen, H.T., Taylor, A.J. and Yu, N. “A review of metasurfaces: physics and applications”. Reports on progress in physics, 79(7), p. 076401 (2016).
    2. Mendhe, S.E. and Kosta, Y.P. “Metamaterial properties and applications”. International Journal of Information Technology and Knowledge Management, 4(1), pp. 85-89 (2011).
    3. Achouri, K. and Caloz, C. “Design, concepts, and applications of electromagnetic metasurfaces”. Nanophotonics, 7(6), pp. 1095-1116 (2018).
    4. Glybovski, S.B., Tretyakov, S.A., Belov, P.A., et al. “Metasurfaces: From microwaves to visible”. Physics reports, 634, pp. 1-72 (2016).
    5. Achouri, K., Khan, B.A., Gupta, S., et al. “Synthesis of electromagnetic metasurfaces: principles and illustrations” . arXiv preprint arXiv:1510.05997 (2015).
    6. Sarychev, A.K., Lagarkov, A.N., Ivanov, A.V., et al. “Metal-dielectric resonances in tip silicon metasurface and SERS based nanosensors”. In Plasmonics: Design, Materials, Fabrication, Characterization, and Applications XV (Vol. 10346, p. 103460C) (2017).
    7. Sleasman, T., Imani, M.F., Boyarsky, M., et al. “Reconfigurable metasurface aperture for security screening and microwave imaging”. In Passive and Active Millimeter-Wave Imaging XX (Vol. 10189, p. 101890G) (2017).
    8. Liu, Z. and Bai, B. Ultra-thin and high-efficiency graphene metasurface for tunable terahertz wave manipulation. Optics express, 25(8), pp.8584-8592 (2017).
    9. Yachmenev, A.E., Lavrukhin, D.V., Glinskiy, I.A., et al. “Metallic and dielectric metasurfaces in photoconductive terahertz devices” : a review. Optical Engineering, 59(6), p. 061608 (2019).
    10. Gao, X., Han, X., Cao, W.P., et al., “Ultrawideband and high-efficiency linear polarization converter based on double V-shaped metasurface,” IEEE Transactions on Antennas and Propagation, 63(8), pp. 3522-3530 (2015).
    11. Jiang, Y., Wang, L., Wang, J., et al. Ultra-wideband high-efficiency reflective linear-to-circular polarization converter based on metasurface at terahertz frequencies. Optics express, 25(22), pp. 27616-27623 (2017).
    12. Gao, X., Yang, W., Cao, W., et al. “Bandwidth broadening of a graphene-based circular polarization converter by phase compensation”. Optics express, 25(20), pp. 23945-23954 (2017).
    13. Yang, Z., Yu, S., Kou, N., et al. “Ultrathin tri-band reflective cross-polarization artificial electromagnetic metasurface”. Journal of Electromagnetic Waves and Applications, pp. 1-11 (2020).
    14. Chen, H.T. and Chang, C.C. “Broadband terahertz polarization conversion using metasurfaces” (Conference Presentation). In Terahertz Emitters, Receivers, and Applications IX (Vol. 10756, p. 107560C) (2018).
    15. Swain, R., Chatterjee, A., Nanda, S. et al. “A Linear-to-Circular Polarization Conversion Metasurface Based Wideband Aperture Coupled Antenna”. Journal of Electrical Engineering & Technology, pp. 1-7 (2020).
    16. Lin, B.Q., Lv, L., Guo, J., et al. Ultra-wideband circular polarization-maintaining reflection realized by an anisotropic metasurface. Journal of Electromagnetic Waves and Applications, pp. 1-10 (2020).
    17. Khan, B., Kamal, B., Ullah, S., et al. “Design and experimental analysis of dual-band polarization converting metasurface for microwave applications”. Scientific Reports, 10(1), pp. 1-13 (2020).
    18. Zhang, L., Zhou, P., Lu, H., et al. “Realization of broadband reflective polarization converter using asymmetric cross-shaped resonator”. Optical Materials Express, 6(4), pp. 1393-1404 (2016).
    19. Cong, L., Cao, W., Zhang, X., et al. “A perfect metamaterial polarization rotator,” Applied Physics Letters, 103(17), p. 171107 (2013).
    20. Goldstein, Dennis H., December 16, Polarized light, Pages 59-61, CRC press, 2016, p 59-61.
    21. Li, Y., Zhang, J., Qu, S., et al. “Achieving wide-band linear-to-circular polarization conversion using ultra-thin bi-layered metasurfaces”. Journal of Applied Physics, 117(4), p. 044501 (2015).
    22. Khan, M.I., Khalid, Z. and Tahir, F.A. Linear and circular-polarization conversion in X-band using anisotropic metasurface. Scientific reports, 9(1), pp. 1-11 (2019).
    23. Fu, C., Sun, Z., Han, L., et al. High-Efficiency “Dual-Frequency Reflective Linear Polarization Converter Based on Metasurface for Microwave Bands,” Applied Sciences, 9(9), p. 1910 (2019).