Switchable Chiroptical Hot-Spots in Silicon Nanodisk
Dimers
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Posted on 2019-07-16 - 14:10
We demonstrate uniform sign optical
chirality generation in dimers
of silicon (Si) nanodisks under linear light polarization through
combination of experimental spectroscopy and electromagnetic simulations.
Excitation of the magnetic dipole resonance in individual Si nanodisks
generates enhanced electric and magnetic fields. We show that the
fields provided by adjacent Si nanodisks excited with linearly polarized
light at the magnetic dipole resonance can align to generate strong
near-field chirality in the gap between the Si nanodisks. The near-field
chirality enhancement for Si nanodisk dimers is compared with that
for resonant gold (Au) nanoparticle dimers that provide almost exclusively
electric field enhancement. We experimentally determine the third
Stokes parameter, S3, of light transmitted
through Si nanodisk dimers fabricated on sapphire as a measure for
the chirality flux and the related near-field chirality. The experiments
confirm the generation of uniform sign optical chirality in the Si
nanodisk dimers whose handedness can be switched through choice of
the orientation of the incident linear light polarization and whose
amplitude decreases with increasing gap separation.
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Zhao, Xin; Reinhard, Björn M. (2019). Switchable Chiroptical Hot-Spots in Silicon Nanodisk
Dimers. ACS Publications. Collection. https://doi.org/10.1021/acsphotonics.9b00388