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Anapole-Enhanced Intrinsic Raman Scattering from Silicon Nanodisks
journal contribution
posted on 2018-06-05, 00:00 authored by Denis G. Baranov, Ruggero Verre, Pawel Karpinski, Mikael KällEnhancement
of inelastic light emission processes through resonant excitation
usually correlates with enhanced scattering of the excitation light,
as is for example typically the case for surface-enhanced fluorescence
and Raman scattering from plasmonic nanostructures. Here, we demonstrate
an unusual case where a reverse correlation is instead observed, that
is, we measure a multifold enhancement of Raman emission along with
suppressed elastic scattering. The system enabling this peculiar effect
is composed of silicon nanodisks excited in the so-called anapole
state, for which electric and toroidal dipoles interfere destructively
in the far-field, thereby preventing elastic scattering, while the
optical fields in the core of the silicon particles are enhanced,
thus, amplifying light–matter interaction and Raman scattering
at the Stokes-shifted emission wavelength. Our results demonstrate
an unusual relation between resonances in elastic and inelastic scattering
from nanostructures and suggest a route toward background-free frequency
conversion devices.
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Anapole-Enhanced Intrinsic Raman Scatteringbackground-free frequency conversion devicesinelastic light emission processestoroidal dipolesanapole statesilicon particlesplasmonic nanostructuressurface-enhanced fluorescencesilicon nanodisksmultifold enhancementStokes-shifted emission wavelengthRaman emissionSilicon Nanodisks Enhancementexcitation light
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