Abstract
Robust and dynamically polarization-controlled tunable plasmon induced transparency (PIT) resonance in designed finite-array nanostructures metasurface is demonstrated, where sharp resonance is guaranteed by design and protected against large geometrical imperfections even for micro-zone sub-array. By employing the explicit analysis of near-field characteristic in the reciprocal-space based on the momentum matching, and the far-field radiation features with point-scattering approach in real-space sparked from Huygens’s principles, the physics of interference resonance for plane-wave optical transmission and reflection of the metasurface is theoretically and thoroughly investigated. The distinctive polarization-selective and Q-tunable PIT shows robust features to performance degradations in traditional PIT system caused by inadvertent fabrication flaws or geometry asymmetry-variations, which paves way for the development of reconfigurable and flexible metasurface and, additionally, opens new avenues in robust and multifunctional controllable nanophotonics device design and applications.
Highlights
Robust and dynamically polarization-controlled tunable plasmon induced transparency (PIT) resonance in designed finite-array nanostructures metasurface is demonstrated, where sharp resonance is guaranteed by design and protected against large geometrical imperfections even for micro-zone sub-array
We introduce a class of compact slits nano-antennas array in metallic film that lift all these limitations and show their feasibility to be dynamically controlled by incidence polarization, where robust PIT with tunable quality factors is demonstrated
We demonstrate that the narrow PIT-like resonances can be guaranteed by carefully designed metasurface without stringent geometrical requirements, and with immunity to structural variations and misalignment
Summary
The intensity of transmission spectra for both TM/TE plane-wave at normal incident for the symmetric/asymmetric structure are theoretically calculated using Eq (3) for convergent values at m = n = 100, and the results are shown in the Fig. 2a. The rotation angles (φ1, φ2, φ3, φ4) of the slits are slightly and randomly changed, where by theory prediction, besides of the shrink ratio values, the unchanged fixed peak position centered at 904 nm is still observed agreeing with the simulation results. The results provide a useful design strategy for plasmonic multifunctional nanostructures and versatile metasurface[25,26,27,28,29]
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