SCIENCE CHINA Information Sciences, Volume 63 , Issue 10 : 202302(2020) https://doi.org/10.1007/s11432-020-2972-0

Integrated multi-scheme digital modulations of spoof surface plasmon polaritons

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  • ReceivedMar 31, 2020
  • AcceptedJun 24, 2020
  • PublishedSep 16, 2020



This work was supported by National Key Research and Development Program of China (Grant Nos. 2017YFA0700201, 2017YFA0700202, 2017YFA0700203), National Natural Science Foundation of China (Grant Nos. 61571117, 61631007, 61701108, 61871127), and the 111 Project (Grant No. 111-2-05).


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  • Figure 1

    (Color online) The proposed SPP structure and resulting multi-scheme modulations. (a) The multi-scheme-modulation SPP waveguide, whose main part is outlined in the purple dashed line. (b) The schematic diagram of a single switchable SPP unit, in which the period $p~=~6$ mm, radius of metal hole $r~=0.2$ mm, width of metallic bar $w_1~=~1.5$ mm, $w_2~=~3.5$ mm, height of metallic bar $h_1~=~4$ mm, and height of upper metallic bar $h_2~=~5$ mm. (c) The schematic diagram of multi-scheme modulations. In different modulation schemes, different modulation SPP signals are generated.

  • Figure 2

    (Color online) Equivalent circuit models of the proposed SPP unit with (a) short-circuit stub and (b) open-circuit stub.

  • Figure 3

    (Color online) (a) Dispersion curves of the proposed SPP unit in the “ON" and “OFF" states; (b), (c) the Eigen-mode field distributions of the SPP units in the “ON" and “OFF" states at 3.7 GHz.

  • Figure 4

    (Color online) Photographs of the fabricated prototype.

  • Figure 5

    (Color online) The measured transmission amplitude (a) and phase spectra (b) of the proposed SPP waveguide in the “ON" and “OFF" states.

  • Figure 6

    (Color online) The simulated near-field distributions of the proposed SPP waveguide in the “OFF" state ((a), (c) and (e)) and “ON" state ((b), (d) and (f)).

  • Figure 7

    (Color online) The measured near-field distributions of the proposed SPP waveguide in the “OFF" state ((a), (c) and (e)) and “ON" state ((b), (d) and (f)).

  • Figure 8

    (Color online) (a) The schematic diagram of measurement system for time-domain spectra; (b) the photograph of the measurement setup; (c), (d) the measured time-domain spectra of transmitted signals in the amplitude-modulation scheme modulated by 5 MHz square wave.

  • Figure 9

    (Color online) The measured time-domain spectra of transmitted signals in the phase-modulation scheme under different inputs. The incident signal at 3.7 GHz modulated by 5 MHz square wave.

  • Figure 10

    (Color online) The measured time-domain spectra of transmitted signals in the frequency-modulation scheme. The incident signals at 1.7 GHz and 6 GHz modulated by 5 MHz square wave.