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Optica Publishing Group
  • Chinese Optics Letters
  • Vol. 19,
  • Issue 1,
  • pp. 013601-
  • (2021)

Chiral plasmonic nanostructure of twistedly stacked nanogaps

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Abstract

Nanogap plasmonic structures with strong coupling between separated components have different responses to orthogonal-polarized light, giving rise to giant optical chirality. Here, we proposed a three-dimensional (3D) nanostructure that consists of two vertically and twistedly aligned nanogaps, showing the hybridized charge distribution within 3D structures. It is discovered that the structure twisted by 60° exhibits plasmonic coupling behavior with/without gap modes for different circular-polarized plane waves, showing giant chiral response of 60% at the wavelength of 1550 nm. By controlling the disk radius and the insulator layer, the circular dichroism signal can be further tuned between 1538 and 1626 nm.

© 2021 Chinese Laser Press

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