Diffractive plasmonic metasurfaces offer the possibility of controlling the flow of light in flat optical systems through the excitation of lattice plasmon modes by a careful metasurface design. Nonetheless, a remaining challenge for this type of structure is the dynamic control of its optical properties via degrees of freedom, such as the polarization states of incoming light. In this report, we explain theoretically and demonstrate experimentally the polarization control over amplitude and propagation direction of lattice plasmon modes supported by a multipolar plasmonic metasurface. These unidirectional optical waves result from the coupling between near-field effects of individual meta-atoms and far-field effects originating from the lattice modes. The device operates over a broad wavelength range, maintaining its directional behavior and enabling it to operate also as a polarization-controlled directional diffraction grating, a power splitter, or an optical router for on-chip photonics applications.
Polarization-controlled unidirectional lattice plasmon modes via a multipolar plasmonic metasurface
Also at: IMEC, Kapeldreef 75, Leuven 3001, Belgium.
Also at: Max Planck, University of Ottawa Center for Extreme and Quantum Photonics, University of Ottawa, Ottawa, Ontario K1N6N5, Canada.
Also at: The Institute of Optics, University of Rochester, Rochester, New York 14627, USA.
Also at: Institute of Physics, University of Graz, NAWI Graz, Universitätsplatz 5, 8010 Graz, Austria and Also at: Christian Doppler Laboratory for Structured Matter Based Sensing, Institute of Physics, Universitätsplatz 5, 8010 Graz, Austria.
Also at: School of Engineering and Sciences, Tecnologico de Monterrey, Monterrey, Nuevo León 64849, Mexico and Also at: ASML Netherlands B.V., De Run 6501, 5504 DR Veldhoven, The Netherlands.
Seyedehniousha Mousavi, Muhammad Abdullah Butt, Zeinab Jafari, Orad Reshef, Robert W. Boyd, Peter Banzer, Israel De Leon; Polarization-controlled unidirectional lattice plasmon modes via a multipolar plasmonic metasurface. Appl. Phys. Lett. 29 April 2024; 124 (18): 181703. https://doi.org/10.1063/5.0195583
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