Out-of-plane symmetry-protected bound states in the continuum in a plasmonic nanofin metasurface

We present a plasmonic nanofin metasurface harnessing the out-of-plane symmetry breaking in parameter space by tuning the triangle angle of 3D laser nanoprinted polymer triangles (named as nanofins) coated with gold. The plasmonic nature of the out-of-plane symmetry-protected BICs enables high field enhancement together with high q-factors from the near- to mid-infrared regions, which were utilised for refractive index and pixelated molecular sensing.

DDC Class

600: Technology

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Out-of-plane symmetry-protected bound states in the continuum in a plasmonic nanofin metasurface