INVESTIGADORES
COMEDI david Mario
artículos
Título:
Non-linear excitation of polariton cavity modes in ZnO single nanocombs
Autor/es:
M. G. CAPELUTO; G. GRINBLAT; M. TIRADO; D. COMEDI; A. BRAGAS
Revista:
OPTICS EXPRESS
Editorial:
OPTICAL SOC AMER
Referencias:
Lugar: Washington; Año: 2014 vol. 22 p. 5341 - 5349
ISSN:
1094-4087
Resumen:
Tunable second harmonic (SH) polaritons have been efficiently
generated in ZnO nanocombs, when the material is excited close to half of
the band-gap. The nonlinear signal couples to the nanocavity modes, and, as
a result, Fabry-Pérot resonances with high Q factors of about 500 are
detected. Due to the low effective volume of the confined modes, matterlight
interaction is very much enhanced. This effect lowers the velocity of
the SH polariton in the material by 50 times, and increases the SH
confinement inside the nanocavity due to this higher refractive index. We
also show that the SH phase-matching condition is achieved through LOphonon
mediation. Finally, birrefringence of the crystal produces a strong
SH intensity dependence on the input polarization, with a high polarization
contrast, which could be used as a mechanism for light switching in the
nanoscale.