title: Sub-bandgap transverse frequency conversion in semiconductor nano-waveguides.
abstract: Transverse frequency conversion in the sub-bandgap spectral region is investigated in semiconductor nanowires and nanoribbons using CW lasers with a pump power less than 1 mW. It is found that the properties of the emissions are strongly dependent on the cross-sectional geometries and the surrounding media of nano-waveguides. The polarization is higher in nano-waveguides under single-mode conditions, and the spatial distribution is more tunable in nano-waveguides with higher-order modes involved. Compared with the birefringent approach, transverse frequency conversion shows lower divergence angles, higher polarization, and more tunable spatial distribution.
authors.affiliation: Shanghai Key Laboratory of Modern Optical System, Engineering Research Center of Optical Instrument and System (Ministry of Education), School of Optical-Electrical and Computer Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China. hpzeng@phy.ecnu.edu.cn.
authors.forename: Fuxing
authors.initials: F
authors.lastname: Gu
authors.forename: Li
authors.initials: L
authors.lastname: Zhang
authors.forename: Guoqing
authors.initials: G
authors.lastname: Wu
authors.forename: Yingbin
authors.initials: Y
authors.lastname: Zhu
authors.forename: Heping
authors.initials: H
authors.lastname: Zeng