Current Optics and Photonics

Optical Society of Korea (한국광학회)
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Broad Dual-band Metamaterial Filter with Sharp Out-of-band Rejections

  • Qi, Limei (School of Electronic Engineering, Beijing University of Posts and Telecommunications) ;
  • Shah, Syed Mohsin Ali (School of Electronic Engineering, Beijing University of Posts and Telecommunications)
  • Received : 2018.09.11
  • Accepted : 2018.11.26
  • Published : 2018.12.25
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Abstract

A broad dual-band terahertz metamaterial filter with sharp out-of-band rejections is designed and demonstrated. The center frequencies of the first and the second bands occur at 0.35 THz and 0.96 THz with 3 dB relative bandwidth of 31% and 17%, respectively. Results are measured using a THz time-domain spectroscopy system that shows agreement with simulations. Physical mechanisms of the broad dual-band resonance are clarified based on transmissions of different structures and surface current density distributions. Influence of structure parameters on the transmission characteristics are discussed. Symmetry of the structure ensures the filter polarization independence at normal incidence. These results supported by the design of the filter could find applications in broad multi-band sensors, terahertz communication systems, and other emerging terahertz technologies.

Keywords

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FIG. 1. Schematic view of the fourfold rotational symmetry filter, where P = 150, R = 70, W= 13, and h = 120 (all sizes in μm). (a) top view, (b) side view, microscope images of the fabricated sample at scale (c) 50 μm and (d) 100 μm.

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FIG. 2. The measured (solid line) and simulated (dash line) transmission curves for the broad dual-band filter at normal incidence.

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FIG. 3. Influence of (a) metal material and (b) dielectric loss on the transmission.

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FIG. 4. Transmission for the dielectric only (dotted line), single metal-dielectric structure (MD, dot-dashed line) and metal-dielectric-metal structure (MDM, solid line). The parameters are same as those in Fig. 1.

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FIG. 5. Surface current density distributions of the two pass bands. The yellow parts indicate the metallic Al layers, red lines with arrows indicate instantaneous directions of the current flow. (a) The top layer and (b) bottom layer of f1 = 0.311 THz. (c) The top layer and (d) bottom layer of f2 = 0.383 THz. (e) The top layer and (f) bottom layer of f3 = 0.898 THz. (g) The top layer and (h) bottom layer of f4 = 1.019 THz.

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FIG. 6. Transmission for different period and radius (a) period P, and (b) radius R.

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FIG. 7. Transmission for different width and substrate thickness (a) width w, and (b) substrate thickness h.

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FIG. 8. Transmission of oblique incidence for (a) TE and (b) TM polarization.

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