Second Harmonic Generation from Phase-Engineered Metasurfaces of Nanoprisms

Metasurfaces of gold (Au) nanoparticles on a SiO [Formula: see text]-Si substrate were fabricated for the enhancement of second harmonic generation (SHG) using electron beam lithography and lift-off. Triangular Au nanoprisms which are non-centro-symmetric and support second-order nonlinearity were e...

Descripción completa

Detalles Bibliográficos
Autores principales: Mochizuki, Kanta, Sugiura, Mako, Yogo, Hirofumi, Lundgaard, Stefan, Hu, Jingwen, Ng, Soon Hock, Nishijima, Yoshiaki, Juodkazis, Saulius, Sugita, Atsushi
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2020
Materias:
Article
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7569796/
https://www.ncbi.nlm.nih.gov/pubmed/32932670
http://dx.doi.org/10.3390/mi11090848
Descripción
Sumario:Metasurfaces of gold (Au) nanoparticles on a SiO [Formula: see text]-Si substrate were fabricated for the enhancement of second harmonic generation (SHG) using electron beam lithography and lift-off. Triangular Au nanoprisms which are non-centro-symmetric and support second-order nonlinearity were examined for SHG. The thickness of the SiO [Formula: see text] spacer is shown to be an effective parameter to tune for maximising SHG. Electrical field enhancement at the fundamental wavelength was shown to define the SHG intensity. Numerical modeling of light enhancement was verified by experimental measurements of SHG and reflectivity spectra at the normal incidence. At the plasmonic resonance, SHG is enhanced up to ∼3.5 × 10 [Formula: see text] times for the optimised conditions.

Ejemplares similares