Revealing Low-Radiative Modes of Nanoresonators with Internal Raman Scattering
arXiv:1905.04483 · doi:10.1134/S0021364019130010
Abstract
Revealing hidden non-radiative (dark) of resonant nanostructures using optical methods such as dark-field spectroscopy often becomes a sophisticated problem due to a weak coupling of these modes with a far-field radiation, whereas methods of dark-modes spectroscopy, e.g. cathodoluminescence or elastic energy losses, are not always convenient in use. Here, we suggest an approach for experimental determining the mode structure of a nanoresonator basing on utilizing intrinsic incoherent Raman scattering. We theoretically predict the efficiency of this approach and realize it experimentally for silicon nanoparticle resonators possessing strong Raman line at 520 cm^-1. With this method, we studied a silicon nanoparticle placed on a gold substrate and reveal the spectral position of a low-radiative magnetic quadrupole mode which is hardly observable with common dark-field optical spectroscopy.
References in corpus (8)
- Resonantly enhanced second-harmonic generation using III-V semiconductor all-dielectric metasurfaces
- Resonant Raman Scattering from Silicon Nanoparticles Enhanced by Magnetic Response
- Purcell factor of Mie resonators featuring electric and magnetic modes
- Laser fabrication of crystalline silicon nanoresonators from an amorphous film for low-loss all-dielectric nanophotonics
- Magnetic dipole radiation tailored by substrates: numerical investigation
- Enhancement of inherent Raman scattering in dielectric nanostructures with electric and magnetic Mie resonances
- All-optical switching and unidirectional plasmon launching with electron-hole plasma driven silicon nanoantennas
- Raman spectra of nanoparticles: elasticity theory-like approach for optical phonons