Plasmonic metasurfaces are two-dimensional arrays of subwavelength-spaced metal nanoparticles that allow for new degrees of light control over nanometer dimensions. As such, metasurfaces constitute a platform for realization of flat optical components, such as wave plates and lenses, that might find applications within compact photonic systems. Moreover, by properly engineering of the metallic nanoparticles metasurfaces may show functionalities not achievable with conventional (i.e., natural) materials.
At SDU Nano Optics, we focus on a specific type of plasmonic metasurface that works in reflection, which we have tailored to a broad range of functionalities, ranging from wave plates and flat parabolic mirrors, via polarization-controlled redirection of light and excitation of surface plasmon polaritons, to analog computations on light fields and new polarimetric designs. The latter two applications have furthermore been highlighted at Phys.org and in the News & Views section of Nature Photonics, respectively.
For further details on our work, we refer to the following research papers:
- Broadband focusing flat mirrors based on plasmonic gradient metasurfaces, Nano Lett. 13, 829 (2013). [PDF]
- Gap plasmon-based metasurfaces for total control of reflected light, Sci. Rep. 3, 2155 (2013). [PDF]
- Efficient unidirectional polarization-controlled excitation of surface plasmon polaritons, Light Sci. Appl. 3, e197 (2014). [PDF]
- Analog computing using reflective plasmonic metasurfaces, Nano Lett. 15, 791 (2015). [PDF]
- Plasmonic metagratings for simultaneous determination of Stokes parameters, Optica 2, 716 (2015). [PDF]