Ordered photonic colloidal suspensions

Jiménez‐Villar, Ernesto; Martins, Weliton S.; Wetter, Niklaus Ursus

doi:10.1364/ao.477410

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2024

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Cited by 2 publications

References 18 publications

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Random Lasers: Review of Research Activities at IPEN

Wetter,

Ribamar Vieira,

da Silva

et al. 2023

2023 International Conference on Optical MEMS and Nanophotonics (OMN) and SBFoton International Optics and Photonics Conference

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Random Lasers: Review of Research Activities at IPEN

Wetter,

Ribamar Vieira,

da Silva

et al. 2023

2023 International Conference on Optical MEMS and Nanophotonics (OMN) and SBFoton International Optics and Photonics Conference

View full text Add to dashboard Cite

Strong Raman enhancement in structured colloids: localization of light

Dipold,

Wetter,

Marques

et al. 2024

J. Opt. Soc. Am. 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.

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Ordered photonic colloidal suspensions

Cited by 2 publications

References 18 publications

Random Lasers: Review of Research Activities at IPEN

Random Lasers: Review of Research Activities at IPEN

Strong Raman enhancement in structured colloids: localization of light

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