A Study on Resonance Properties of a Terahertz Asymmetric Split-Loop Resonator Type Metamaterial for High Quality Factor

테라헤르츠 비대칭 분리고리공진기 메타물질의 높은 품질인자를 위한 공진 특성에 관한 연구

  • Park, Dae-Jun (Dept. of convergence science, Sahmyook University) ;
  • Ryu, Han-Cheol (Dept. of convergence science, Sahmyook University)
  • 박대준 (삼육대학교 융합과학과) ;
  • 류한철 (삼육대학교 융합과학과)
  • Received : 2016.09.22
  • Accepted : 2016.11.10
  • Published : 2016.11.30


A terahertz asymmetric split-loop resonator (ASLR) was analyzed for use in high-sensitivity sensing applications. Its structural asymmetricity induces an asymmetric Fano resonance which has a high quality factor compared to the symmetric eigen-resonance. The variations of the resonant frequency, transmission coefficient, and quality factor of the ASLR in the eigen and Fano resonances are analyzed as a function of its structural asymmetricity. Also, the surface current densities on the ASLR in both resonances are calculated to analyze the main cause of the variations of its transmission characteristics. The surface current of the ASLR in the eigen resonance shows a dipole resonance, which increases the radiation loss and reduces the quality factor. On the other hand, the surface current of the ASLR in the Fano resonance shows a trapped or quadrupole mode which has a low radiation loss. Therefore, the ASLR operated in the Fano resonance has a high quality factor. Terahertz, high-performance filters and high sensitivity sensors can be developed based on our analysis results of the ASLR having a high quality factor. These high-performance devices based on terahertz metamaterials could increase the adoption of terahertz industrial applications.


Terahertz;Metamaterial;Asymmetric split-loop resonator;Fano resonance;Quality factor


Supported by : 삼육대학교


  1. Kawase, K.; Ogawa, Y.; Watanabe, Y.; Inoue, H. "Non-destructive terahertz imaging of illicit drugs using spectral fingerprints", Optics Express, 11, 2549, 2003. DOI:
  2. P. U. Jepsen, D. G. Cooke, and M. Koch, "Terahertz spectroscopy and imaging - Modern techniques and applications", Laser Photon. Rev. 5, pp. 124-166, 2011. DOI:
  3. M. Tonouchi, "Cutting-edge terahertz technology." Nat. Photonics 1, pp. 97-105, 2007. DOI:
  4. J. Valentine, S. Zhang, T. Zentgraf, E. Ulin-Avila, D. A. Genov, G. Bartal, and X. Zhang, "Three-dimensional optical metamaterial with negative refractive index", Nature 455, pp. 376-379, 2008. DOI:
  5. D. Schurig, J. J. Mock, B. J. Justice, S. A. Cummer, J. B. Pendry, A. F. Starr, D. R. Smith, "Metamaterial electromagnetic cloak at microwave frequencies", Science 314, pp. 977-979, 2006. DOI:
  6. M. Choi, S. H. Lee, Y. Kim, S. B. Kang, J. Shin, M. H. Kwak, K. -Y. Kang, Y.-H. Lee, N. Park, and B. Min, "A terahertz metamaterial with unnaturally high refractive index", Nature 470, pp. 369-373, 2011. DOI:
  7. Christian Debus, Peter Haring Bolivar, "Frequency selective surfaces for high sensitivity terahertz sensing", Applied Physics Letters 91, 184102, 2007. DOI:
  8. Ibraheem Al-Naib, Erik Hebestreit, Carsten Rockstuhl, Falk Lederer, Demetrios Christodoulides, Tsuneyuki Ozaki, and Roberto Morandotti, "Conductive Coupling of Split Ring Resonators: A Path to THz Metamaterials with Ultrasharp Resonances", PRL 112, 183903, 2014. DOI:
  9. Hadi Amarloo, Daniel M. Hailu, and Safieddin Safavi-Naeini, "Multiple Fano Resonances Structure for Terahertz Applications", Progress In Electromagnetics Research Letters, vol. 50, 2014. DOI:
  10. Ranjan Singh,Ibraheem A. I. Al-Naib, Martin Koch, and Weili Zhang, "Sharp Fano resonances in THz metamaterials", OPTICS EXPRESS 6312, 28, vol. 19, no. 7, Mar. 2011. DOI:
  11. Ndubuisi E. J. Omaghali, Volodymyr Tkachenko, Antonello Andreone, Giancarlo Abbate, "Optical Sensing Using Dark Mode Excitation in an Asymmetric Dimer Metamaterial", Sensors, 14, pp. 272-282, 2014. DOI:
  12. Ranjan Singh, Ibraheem A. I. Al-Naib, Yuping Yang, Dibakar Roy Chowdhury, Wei Cao, Carsten Rockstuhl, Tsuneyuki Ozaki, Roberto Morandotti, and Weili Zhang, "Observing metamaterial induced transparency in individual Fano resonators with broken symmetry", APPLIED PHYSICS LETTERS 99, 201107, 2011. DOI:
  13. Wei Cao, Ranjan Singh, Ibraheem A. I Al-Naib, Mingxia He, Antoinette J. Taylor, and Weili Zhang, "Low-loss ultra-high-Q dark mode plasmonic Fano metamaterials", OPTICS LETTERS / Vol. 37, No. 16 / August 15, 2012. DOI:
  14. Ibraheem Al-Naib, Yuping Yang, Marc M. Dignam, Weili Zhang, and Ranjan Singh, "Ultra-high Q even eigenmode resonance in terahertz metamaterials", APPLIED PHYSICS LETTERS 106, 011102, 2015. DOI:
  15. Yu Yuan, Christopher Bingham, Talmage Tyler, Sabarni Palit, Thomas H. Hand, Willie J. Padilla, Nan Marie Jokerst, and Steven A. Cummer, "A dual-resonant terahertz metamaterial based on single-particle electric-field-coupled resonators", APPLIED PHYSICS LETTERS 93, 191110, 2008. DOI:
  16. Christian Jansen, Ibraheem A. I. Al-Naib, Norman Born, and Martin Koch1, "Terahertz metasurfaces with high Q-factors", APPLIED PHYSICS LETTERS 98, 051109, 2011. DOI:
  17. Shengyan Yang, Zhe Liu, Xiaoxiang Xia, Yiwen E, Chengchun Tang, Yujin Wang, Junjie Li, Li Wang, and Changzhi Gu, "Excitation of ultrasharp trapped-mode resonances in mirror-symmetric metamaterials", PHYSICAL REVIEW B 93, 235407, 2016. DOI:
  18. Ranjan Singh, Wei Cao, Ibraheem Al-Naib, Longqing Cong, Withawat Withayachumnankul, and Weili Zhang, "Ultrasensitive THz sensing with high-Q Fano resonances in metasurfaces", Appl. Phys. Lett. 105, 171101, 2014. DOI: