Steering the optical response with asymmetric bowtie 2-color controllers in the visible and near infrared range

We have proposed an asymmetric bowtie 2-color controller and analyzed its resonance frequency spectra and temporal responses. The results show improved optical properties of the asymmetric bowtie 2-color controller as compared to symmetric bowties. The improved optical properties are a broad bandwidth of the plasmonic spectrum consisting of two resonant peaks, a high field enhancement in the gap of the bowtie structure, and a large effective enhancement volume. The system might have applications in the generation of XUV light via high-harmonic generation as well as in ultrabroadband sensors and multicolor optoelectronic filters.

► Proposed an asymmetric bowtie 2-color controller. ► Support multiple resonances in the visible and NIR range. ► Lead to broad overall bandwidth and ultrafast responses. ► Show an intensity enhancement factor exceeding 103 with larger effective volume. ► Potential applications for HHG and ultrabroadband sensing.