Li_2020_Direct.pdf (2.69 MB)
Direct visualization of phase-matched efﬁcient second harmonic and broadband sum frequency generation in hybrid plasmonic nanostructures
journal contributionposted on 2022-09-30, 14:00 authored by Zhe Li, Brian Corbett, Agnieszka Gocalinska, Emanuele Pelucchi, Wen Chen, KEVIN M. RYANKEVIN M. RYAN, Pritam Khan, Christophe SilienChristophe Silien, Hongxing Xu, NING LIUNING LIU
Second harmonic generation and sum frequency generation (SHG and SFG) provide effective means to realize coherent light at desired frequencies when lasing is not easily achievable. They have found applications from sensing to quantum optics and are of particular interest for integrated photonics at communication wavelengths. Decreasing the footprints of nonlinear components while maintaining their high up-conversion efﬁciency remains a challenge in the miniaturization of integrated photonics. Here we explore lithographically deﬁned AlGaInP nano (micro)structures/ Al2O3/Ag as a versatile platform to achieve efﬁcient SHG/SFG in both waveguide and resonant cavity conﬁgurations in both narrow- and broadband infrared (IR) wavelength regimes (1300–1600nm). The effective excitation of highly conﬁned hybrid plasmonic modes at fundamental wavelengths allows efﬁcient SHG/SFG to be achieved in a waveguide of a cross-section of 113nm×250nm, with a mode area on the deep subwavelength scale (λ2/135) at fundamental wavelengths. Remarkably, we demonstrate direct visualization of SHG/SFG phase-matching evolution in the waveguides. This together with mode analysis highlights the origin of the improved SHG/SFG efﬁciency. We also demonstrate strongly enhanced SFG with a broadband IR source by exploiting multiple coherent SFG processes on 1µm diameter AlGaInP disks/Al2O3/Ag with a conversion efﬁciency of 14.8%MW−1 which is ﬁve times the SHG value using the narrowband IR source. In both conﬁgurations, the hybrid plasmonic structures exhibit >1000 enhancement in the nonlinear conversion efﬁciency compared to their photonic counterparts. Our results manifest the potential of developing suchnanoscale hybrid plasmonic devices for state-of-the-art on-chip nonlinear optics applications.
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PublicationLight Science & Applications;9, 180
Other Funding informationWuhan University, SFI, IRC
Also affiliated with
- Bernal Institute
Department or School