| Full text | |
| Author(s): |
Dipold, Jessica
;
Wetter, Niklaus U.
;
Marques, Francisco C.
;
Dogariu, Aristide
;
Jimenez-Villar, Ernesto
Total Authors: 5
|
| Document type: | Journal article |
| Source: | NANOSCALE; v. 17, n. 6, p. 11-pg., 2024-12-11. |
| Abstract | |
We use non-resonant Raman scattering to demonstrate a large enhancement of the effective refractive index experienced by Raman photons in a scattering medium comprising spatially-correlated photonic structures of core-shell TiO2@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. (AU) | |
| FAPESP's process: | 21/04334-7 - Raman Spectroscopy of nanoparticles: substrates for ultra-sensitive detection and validation of a methodology for physical-chemical characterization of nanoplastics with analysis of physiological interactions in cell cultures |
| Grantee: | Niklaus Ursus Wetter |
| Support Opportunities: | Regular Research Grants |
| FAPESP's process: | 17/10765-5 - Highly efficient low threshold lasers in transparent and scattering media. |
| Grantee: | Niklaus Ursus Wetter |
| Support Opportunities: | Regular Research Grants |
| FAPESP's process: | 22/02525-2 - Localization of light: a new optics, paving the way for new photonics tools |
| Grantee: | Niklaus Ursus Wetter |
| Support Opportunities: | Research Grants - Visiting Researcher Grant - Brazil |
| FAPESP's process: | 17/11986-5 - Generation and storage of New Energy: bringing technological development for the country |
| Grantee: | Ana Flávia Nogueira |
| Support Opportunities: | Research Grants - Research Centers in Engineering Program |
| FAPESP's process: | 19/06334-4 - Advanced photonic devices for microfluidic systems: random lasers |
| Grantee: | Jessica Dipold |
| Support Opportunities: | Scholarships in Brazil - Post-Doctoral |