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Multi-Band Terahertz Filter with Independence to Polarization and Insensitivity to Incidence Angles

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Abstract

Multi-band terahertz filters with independence to polarization and insensitivity to incidence angles are designed, fabricated, and measured, respectively. The promoted multi-band terahertz filters consist of two and three concentric ring complementary structure. Compared with the dual-ring structure, the triple-ring structure not only increases numbers of the pass bands but also heightens the out-of-band rejection of the middle band. The physical mechanisms of the multi-band resonant responses are clarified using three different configurations and distribution of magnetic fields and current surfaces. At normal incidence, the triple-ring structure is independent to polarization due to the symmetry. At oblique incidences, transmission magnitudes as a function of the frequency are firstly demonstrated for the multi-band filter; it is found that this structure shows great insensitivity to incidence angles. The multi-band filter also has advantages in easy fabrication. The encouraging results afforded by the design of the filters could find applications in multi-band sensors, terahertz communication systems, and other emerging terahertz technologies.

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Acknowledgments

This work was supported by the National Natural Science Foundation of China (11174280 and 61107030), the Knowledge Innovation Program of Chinese Academy of Sciences (YYYJ-1123), and the China Postdoctoral Science Foundation (2012 M520377).

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Authors and Affiliations

  1. Key Laboratory of Electromagnetic Radiation and Sensing Technology, Chinese Academy of Sciences, Beijing, 100190, China

    Limei Qi & Chao Li

  2. School of Electronic Engineering, Beijing University of Posts and Communications, Beijing, 100876, China

    Limei Qi

Authors
  1. Limei Qi
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  2. Chao Li
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Correspondence to Chao Li.

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Qi, L., Li, C. Multi-Band Terahertz Filter with Independence to Polarization and Insensitivity to Incidence Angles. J Infrared Milli Terahz Waves 36, 1137–1144 (2015). https://doi.org/10.1007/s10762-015-0202-4

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  • DOI: https://doi.org/10.1007/s10762-015-0202-4

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