Abstract
We study laser-induced guided-mode resonances on an ultrathin anisotropic metallic metasurface using direct near-field mapping. Coupling of the incident light to the guided-mode resonances is provided by a resonant laser-printed silicon nanosphere placed on the metasurface using nanomanipulation under electron-beam supervision. To visualize the propagation of the guided modes, we employ scattering-type scanning near-field optical microscopy in the near-infrared region (850 nm). The guided-mode resonances excited by the nanosphere demonstrate vanishing anisotropy due to weak confinement at the metasurface/air interface. We also extract the wavenumber of the observed modes through Fourier transformation of the measured near-field maps and find it to be in good agreement with numerical calculations.
Original language | English |
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Journal | ACS Photonics |
Volume | 5 |
Issue number | 11 |
Pages (from-to) | 4238-4243 |
ISSN | 2330-4022 |
DOIs | |
Publication status | Published - 1 Jan 2018 |
Keywords
- Anisotropy
- Guided-mode resonance
- Metasurface
- Nano-optics
- S-SNOM
- Surface waves