Bandwidth Enhancement of Planar Terahertz Metasurfaces via Overlapping of Dipolar Modes

Abstract

We present enhancement of operational bandwidths of planar terahertz metasurfaces by incorporating a complex unit cell that consists of a pair of concentric ring resonators. The inner resonator is a closed ring, while the outer resonator contains a pair of split gaps introduced symmetrically into the two opposite arms. The enhancement of the bandwidth is attributed to the spectral overlapping of the resonant responses arising from both the resonators. A total of five metasurface samples (MM1 to MM5) have been designed, fabricated, and characterized using terahertz time domain spectroscopy (THz-TDS). Resonance broadening along with the blue shifting of higher order resonance mode is being observed while introducing the split gaps in the outer ring and increasing the split gap length (MM1 to MM5) successively. We have further performed detailed numerical investigations in order to explain the experimental observations which support the experimental results. Such metasurfaces can pave the way to realize versatile photonic applications including broadband modulators and band stop filters in the comparatively lesser explored yet technologically relevant terahertz region.

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Acknowledgments

DK acknowledges financial support received via Department of Science & Technology (DST) INSPIRE doctoral research fellowship, Ministry of Science and Technology, Government of India. Authors DRC and SB acknowledge support from Department of Science & Technology (DST), project EMR/2015/001339. We also acknowledge support from the Los Alamos National Laboratory LDRD Program and the Center for Integrated Nanotechnologies, a US Department of Energy, Office of Basic Energy Sciences Nanoscale Science Research Centre operated jointly by Los Alamos and Sandia National Laboratories.

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Correspondence to Dibakar Roy Chowdhury.

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Kumar, D., Jain, R., Shahjahan et al. Bandwidth Enhancement of Planar Terahertz Metasurfaces via Overlapping of Dipolar Modes. Plasmonics (2020). https://doi.org/10.1007/s11468-020-01222-7

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Keywords

  • Broadband
  • Metasurface
  • Metamaterial
  • Resonance
  • Terahertz