Hybrid anisotropic plasmonic metasurfaces with multiple resonances of focused light beams

Yao Liang, Han Lin, Shirong Lin, Jiayang Wu, Weibai Li, Fei Meng, Yunyi Yang, Xiaodong Huang, Baohua Jia*, Yuri Kivshar*

*Corresponding author for this work

    Research output: Contribution to journalArticlepeer-review

    90 Citations (Scopus)

    Abstract

    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 high-NA 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.

    Original languageEnglish
    Pages (from-to)8917-8923
    Number of pages7
    JournalNano Letters
    Volume21
    Issue number20
    DOIs
    Publication statusPublished - 27 Oct 2021

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