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We propose the asymmetrical plasmonic slot waveguide (APSW) design for third-harmonic generation (THG) from 2.25 <formula formulatype="inline"><tex Notation="TeX">$\mu\hbox{m}$</tex></formula>. In this configuration, the phase-matching condition is fulfilled between the zeroth-order mode at fundamental frequency (FF) and the first-order mode at third-harmonic frequency (THF). Due to the asymmetrical geometry, the mode overlap between the two involved modes is significantly enhanced, leading to an efficient THG process. According to the numerical calculation, the conversion efficiency is predicted up to 1.4% with 1-W pump power. The proposed APSW has the potential to realize an integrated efficient THG device in nanometer scale.

ieee photonics journal

Efficient Third-Harmonic Generation From 2 <formula formulatype="inline"><tex Notation="TeX">$\mu \hbox{m}$</tex></formula> in Asymmetric Plasmonic Slot Waveguide

Efficient Third-Harmonic Generation From 2 $\mu \hbox{m}$ in Asymmetric Plasmonic Slot Waveguide