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Wavelength selective beam-steering in a dual-mode multi-layer plasmonic laser.
Optics Express
|June 11, 2024
Summary
Researchers developed a dual-mode plasmonic laser that spatially separates its light modes using a metasurface beam-splitter. This innovation enables tailored applications for each mode, advancing optical technologies.
Area of Science:
- Photonics and Plasmonics
- Nanotechnology
- Optical Engineering
Background:
- Plasmonic crystal nanolasers offer enhanced light localization but lack spatial mode separation.
- Difficulty in applying different modes to distinct applications hinders their utility.
Purpose of the Study:
- To demonstrate a method for spatially separating the two lasing modes of a dual-mode plasmonic laser.
- To enable distinct spatial beams for each lasing mode.
Main Methods:
- Integration of a flat dielectric metasurface beam-splitter into a merged lattice metal nanohole array laser.
- Exploitation of phase gradient profiles on metasurface interfaces for mode separation.
Main Results:
- Successful spatial separation of two lasing modes by approximately 23 degrees.
- Tunable mode separation up to 63 degrees by adjusting nanocylinder radius and supercell rows.
- Generation of multiple beams with potential for manual beam steering.
Conclusions:
- The proposed integrated structure effectively separates dual-mode plasmonic laser outputs into distinct spatial beams.
- This technique offers device miniaturization and broad applicability in optical communication, quantum optics, and LiDAR.
- The approach provides high emission output, narrow linewidth, and significant tunability for future advancements.
