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Cross-polarized surface lattice resonances in a rectangular lattice plasmonic metasurface
Optics Letters
|April 15, 2022
Summary
Researchers developed a plasmonic metasurface with two distinct, narrow resonances. This breakthrough achieves record-high quality factors for metasurface applications in nonlinear optics and optical switching.
Area of Science:
- Plasmonics
- Metasurfaces
- Nanophotonics
Background:
- Multiresonant metasurfaces offer potential in filtering, sensing, and nonlinear optics.
- Achieving multiple high-quality-factor (high-Q) resonances at specific wavelengths remains a significant challenge.
Purpose of the Study:
- To experimentally demonstrate a plasmonic metasurface with distinct, narrow surface lattice resonances.
- To leverage the polarization degree of freedom for controlling lattice mode propagation.
Main Methods:
- Fabrication of aluminum nanostructures arranged in a rectangular periodic lattice.
- Exploitation of polarization to induce different lattice modes along distinct lattice dimensions.
- Characterization of surface lattice resonances and their quality factors.
Main Results:
- Observation of surface lattice resonances around 640 nm (Q factor ~50) and 1160 nm (Q factor ~800).
- The 1160 nm resonance achieved a record-high plasmonic quality factor within the near-infrared type-II window.
- Demonstrated control over resonance properties through polarization manipulation.
Conclusions:
- The developed metasurface successfully exhibits multiple, narrow resonances with high-Q factors.
- This platform is promising for advanced applications like frequency conversion and all-optical switching.
- Exploiting polarization offers a viable route for designing complex metasurface functionalities.
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