Multiresonant High-Q Plasmonic Metasurfaces
Abstract
Resonant metasurfaces are devices composed of nanostructured sub-wavelength scatterers that generate narrow optical resonances, enabling applications in filtering, nonlinear optics, and molecular fingerprinting. It is highly desirable for these applications to incorporate such devices with multiple, high-quality-factor resonances; however, it can be challenging to obtain more than a pair of narrow resonances in a single plasmonic surface. Here, we demonstrate a multi-resonant metasurface that operates by extending the functionality of surface lattice resonances, which are the collective responses of arrays of metallic nanoparticles. This device features a series of resonances with high quality factors (Q ~ 40), an order of magnitude larger than what is typically achievable with plasmonic nanoparticles, as well as a narrow free spectral range. This design methodology can be used to better tailor the transmission spectrum of resonant metasurfaces and represents an important step towards the miniaturization of optical devices.
- Publication:
-
Nano Letters
- Pub Date:
- September 2019
- DOI:
- 10.1021/acs.nanolett.9b02638
- arXiv:
- arXiv:1907.00458
- Bibcode:
- 2019NanoL..19.6429R
- Keywords:
-
- Physics - Optics
- E-Print:
- 8 pages, 4 figures, includes MATLAB code in Supplementary Materials