Work

Strong enhancement of effective refractive index in structured colloids (TiO 2 @Silica): Localization of light

Year: 2024

Type: article

Abstract: @Silica scatterers mixed with silica nanoparticles and suspended in ethanol. We show that the high refractive index extends outside the physical boundary of the medium, which is attributed to the evanescent contributions of electromagnetic modes that are strongly localized within the medium. Notably, the effective enhancement can be observed even at very low intensities of Raman emission. This anomalous non-linear phenomenon could be explained by the successive polarization of valence electrons to virtual states induced by the strong photon correlations in the strongly localized electromagnetic modes. The enhancement of refractive index and its extension in the vicinity of the medium's interface provide new opportunities for controlling the electromagnetic fields in advanced photonic devices.

Source: Nanoscale

DOI: 10.1039/d4nr03626c

Authors: Jessica Dipold, Niklaus U. Wetter, Francisco C. Marques, Aristide Dogariu, Ernesto Jiménez-Villar

Institutions: Instituto de Pesquisas Energéticas e Nucleares, Universidade Estadual de Campinas (UNICAMP), University of Central Florida

Language: English

Topic: Random lasers and scattering media

Subfield: Acoustics and Ultrasonics

Field: Physics and Astronomy

Domain: Physical Sciences

Open Access status: bronze

Funders: Fundação de Amparo à Pesquisa do Estado de São Paulo, Conselho Nacional de Desenvolvimento Científico e Tecnológico, Comissão Nacional de Energia Nuclear, Office of Naval Research