Journal
NANO LETTERS
Volume 21, Issue 20, Pages 8917-8923Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.1c02751
Keywords
bound states in the continuum; plasmonic metasurfaces; high numerical aperture; anisotropy
Categories
Funding
- Australian Research Council through the Discovery Project scheme [DP190103186]
- Industrial Transformation Training Centres scheme [IC180100005]
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This study demonstrates multiple resonances with high absorption amplitudes by utilizing the physics of bound states in the continuum, providing novel strategies for designing photonic devices that manipulate focused light.
Plasmonic metasurfaces supporting collective lattice resonances have attracted increasing interest due to their exciting properties of strong spatial coherence and enhanced light-matter interaction. Although the focusing of light by high-numerical-aperture (NA) objectives provides an essential way to boost the field intensities, it remains challenging to excite high-quality resonances by using highNA objectives due to strong angular dispersion. Here, we address this challenge by employing the physics of bound states in the continuum (BICs). We design a novel anisotropic plasmonic metasurface combining a two-dimensional lattice of high-aspect-ratio pillars with a one-dimensional plasmonic grating, fabricated by a two-photon polymerization technique and gold sputtering. We demonstrate experimentally multiple resonances with absorption amplitudes exceeding 80% at mid-IR using an NA = 0.4 reflective objective. This is enabled by the weak angular dispersion of quasi-BIC resonances in such hybrid plasmonic metasurfaces. Our results suggest novel strategies for designing photonic devices that manipulate focused light with a strong field concentration.
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