Strong Raman enhancement in structured colloids
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Journal of the Optical Society of America B
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Raman spectroscopy is a powerful technique for studying the interaction between light and matter. Here we show a
significant enhancement of Raman emission over a broad range of pumping wavelengths from strongly scattering
media comprising spatially correlated photonic structures of core–shell TiO2@Silica scatterers mixed with silica
nanoparticles and suspended in ethanol. Long-range Coulomb interactions between nanoparticles inside these
photonic colloidal structures induce a correlation in the scatterers’ positions (TiO2@Silica), affecting local and
global photonic properties. The anomalous enhancement in Raman signal increases as the scattering strength is
increased (through either scatterer concentration or pumping wavelength); however, the signal strength continues
to behave linearly with excitation power, ruling out classical nonlinear and interferential phenomena. These observations may indicate strong photon correlation in strongly localized electromagnetic modes, inducing successive
photon interactions with the atoms or molecules. Aside from the fundamental relevance to understanding measurable properties in this regime of strongly localized electromagnetic modes, our demonstration of strongly enhanced
Raman emission over a broad range of pumping wavelengths provides new opportunities for the development of
advanced photonic materials and devices.
Como referenciar
DIPOLD, JASSICA; WETTER, NIKLAUS U.; MARQUES, FRANCISCO C.; FREITAS, ANDERSON Z.; DOGARIU, ARISTIDE; JIMENES-VILLAR, ERNESTO. Strong Raman enhancement in structured colloids: localization of light. Journal of the Optical Society of America B, v. 41, n. 6, p. 1415-1424, 2024. DOI: 10.1364/JOSAB.523100. Disponível em: https://repositorio.ipen.br/handle/123456789/48084. Acesso em: 30 Dec 2025.
Esta referência é gerada automaticamente de acordo com as normas do estilo IPEN/SP (ABNT NBR 6023) e recomenda-se uma verificação final e ajustes caso necessário.