All-plasmonic optical leaky-wave antenna with a low sidelobe level
Figures & Tables
Fig. 1. (a) 3D schematic view of the proposed low-sidelobe plasmonic antenna. (b) Cross-section view of a uniform plasmonic gap waveguide. (c) E-field distribution of the plasmonic gap mode. The parameters are
, , and .
Fig. 2. Schematic views of (a) uniform plasmonic gap waveguide and (b) sinusoidally modulated antenna. (c) Metal absorption loss
and normalized phase constant versus gap width . (d) Average attenuation constant of the system and leakage factor of the antenna as a function of modulation amplitude with .
Fig. 3. (a) Target Chebyshev amplitude distribution along antenna radiation aperture. (b) Theoretical modulation amplitudes and leakage factors for the 12 radiation periods. The blue symbols represent the fitting points with a quadratic function formula. (c) Simulated far-field patterns on the
plane at 1500, 1550, and 1600 nm. (d) Radiation efficiency and directivity of the proposed LWA within the wavelength range of 1500 to 1600 nm.
Fig. 4. (a) Proposed antenna under the coordinate system. (b) 3D radiation pattern of the designed antenna. (c) Radiation patterns in the
and planes. (d) Port reflection coefficient as a function of wavelength.
Fig. 5. SEM image of the (a) referenced structure and (b) fabricated array composed of designed SLL antennas. Measured far-field pattern of the (c) referenced array and (d) proposed design. (e) Measured Fourier-space images of the proposed design at wavelengths of 1527, 1550, and 1570 nm.
Fig. 6. (a) Schematic diagram of the operating principle of the proposed leaky-wave antenna. (b) Theoretical normalized radiation pattern in the
plane based on the designed Chebyshev amplitude distribution.
Guang Zhu Zhou, Bao-Jie Chen, Geng-Bo Wu, Shi-Wei Qu, Chi Hou Chan. All-plasmonic optical leaky-wave antenna with a low sidelobe level[J]. Photonics Research, 2023, 11(9): 1500.