| Full text | |
| Author(s): |
Dipold, Jessica
;
Wetter, Niklaus U.
;
Marques, Francisco C.
;
Freitas, Anderson Z.
;
Dogariu, Aristide
;
Jimenez-Villar, Ernesto
Total Authors: 6
|
| Document type: | Journal article |
| Source: | JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS; v. 41, n. 6, p. 10-pg., 2024-06-01. |
| Abstract | |
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 TiO 2 @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 (TiO 2 @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. (c) 2024 Optica Publishing Group (AU) | |
| FAPESP's process: | 19/06334-4 - Advanced photonic devices for microfluidic systems: random lasers |
| Grantee: | Jessica Dipold |
| Support Opportunities: | Scholarships in Brazil - Post-Doctoral |
| 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: | 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: | 17/10765-5 - Highly efficient low threshold lasers in transparent and scattering media. |
| Grantee: | Niklaus Ursus Wetter |
| Support Opportunities: | Regular Research Grants |
| 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: | 18/19240-5 - Multi-user equipment approved in grant 2017-50332-0: STM-AFM Raman SNOM analysis system |
| Grantee: | Anderson Zanardi de Freitas |
| Support Opportunities: | Multi-user Equipment Program |