Helicity Density Maximization in a Planar Array of Achiral High-Density Dielectric Nanoparticles
arXiv:1905.03387 · doi:10.1063/1.5138600
Abstract
We investigate how a periodic array composed of achiral isotropic high-refractive index dielectric nanospheres generates nearfield over the array surface reaching helicity density very close to its upper bound. The required condition for an array of nanospheres to generate optimally chiral nearfield, which represents the upper bound of helicity density, is derived in terms of array effective electric and magnetic polarizabilities that almost satisfy the effective Kerker condition for arrays. The discussed concepts find applications in improving chirality detection based on circular dichroism (CD) at surface level instead of in the bulk. Importantly the array would not contribute to the generated CD signal when used as a substrate for detecting chirality of a thin layer of chiral molecules. This eliminates the need to separate the CD signal generated by the array from that of the chiral sample.
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Cited by in corpus (7)
- Molecular-Induced Chirality Transfer to Plasmonic Lattice Modes
- Optimally Chiral Electromagnetic Fields: Helicity Density and Interaction of Structured Light with Nanoscale Matter
- Achiral dielectric metasurfaces for spectral and polarization control of valley specific light emission from monolayer MoS2
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- Helicity Maximization of Structured Light to Empower Nanoscale Chiral Matter Interaction
- The Azimuthally-Radially Polarized Beam: Helicity and Momentum Densities, Generation and Optimal Chiral Light
- Experimental generation of optimally chiral azimuthally-radially polarized beams