Journal
ACS PHOTONICS
Volume 5, Issue 7, Pages 2730-2736Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsphotonics.8b00480
Keywords
Raman scattering; high-index materials; silicon nanoparticles; anapole
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Funding
- Knut and Alice Wallenberg Foundation
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Enhancement emission processes through resonant excitation usually correlates with enhanced tiring of the excitation light, as is for ex plc typically the case for surface-enhanced fluorescence and Raman scattering from plasmonic nanostructures. Here, we 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 ill 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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