Open AccessEfficient second harmonic generation in internal asymmetric plasmonic slot waveguide
Author(s) -
Tianye Huang,
Patrick Moteng Tagne,
Songnian Fu
Publication year - 2016
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.24.009706
Subject(s) - second harmonic generation , optics , energy conversion efficiency , plasmon , waveguide , materials science , phase matching , nonlinear optics , wavelength , quasi phase matching , harmonic , high harmonic generation , phase (matter) , optoelectronics , slot waveguide , physics , photonics , silicon photonics , laser , quantum mechanics
We theoretically propose an internal asymmetric plasmonic slot waveguide (IAPSW), containing two different materials in the slot region. The IAPSW is used for second harmonic generation (SHG) at a wavelength of 1.55 μm. The required phase matching condition is satisfied between the 0th-order mode at the fundamental frequency and the 1st-order mode at the second harmonic frequency. By choosing appropriate slot geometry and materials, the mode field distribution is engineered to enhance the nonlinear coupling coefficient for SHG. With an 11 μm long IAPSW, a conversion efficiency of 24% (1.8 × 10 5 W -1 cm -2 normalized conversion efficiency) is predicted. Furthermore, the SHG efficiency is more pronounced in IAPSW with thinner slot.