Phase-matched third-harmonic generation via doubly resonant optical surface modes in 1D photonic crystals[J]. LSA, 2016,5(4).
Konopsky, V. N. et al. Phase-matched third-harmonic generation via doubly resonant optical surface modes in 1D photonic crystals. Light: Science & Applications, 5, e16168 (2016).
Phase-matched third-harmonic generation via doubly resonant optical surface modes in 1D photonic crystals[J]. LSA, 2016,5(4). DOI: 10.1038/lsa.2016.168.
Konopsky, V. N. et al. Phase-matched third-harmonic generation via doubly resonant optical surface modes in 1D photonic crystals. Light: Science & Applications, 5, e16168 (2016). DOI: 10.1038/lsa.2016.168.
Phase-matched third-harmonic generation via doubly resonant optical surface modes in 1D photonic crystals
Efficient nonlinear conversion requires that interacting optical waves maintain a consistent phase relationship when traveling in a medium despite its dispersion. Birefringent phase-matching
which is often used to compensate for the dispersion
is not applicable to optically isotropic nonlinear materials. Here
we present a one-dimensional photonic crystal structure that allows the propagation of optical surface waves
both at the fundamental and third-harmonic frequencies
as an efficient medium for phase-matched third-harmonic generation. A unique advantage of this structure is that the effective refractive indices for the surface waves are similar to the refractive index of air at both frequencies. This allows phase-matching between the first and third harmonics
and a visible collinear beam of the third harmonic is produced at the prism-coupled output. Moreover
these optical surface waves propagate over long distances even if a lossy nonlinear nanofilm is deposited onto the photonic crystal surface. We provide experimental results for third-harmonic generation at a wavelength of 410 nm for a bare dielectric Ta
2
O
5
/SiO
2
multilayer structure and for the same structure coated with a 15-nm GaAs film.
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