Abstract
In this paper, we investigate second harmonic generation in a single hexagonal GaAs nanowire. An excellent frequency converter based on this nanowire excited using a femtosecond laser is demonstrated to operate over a range from 730 nm to 1960 nm, which is wider than previously reported ranges for nanowires in the literature. The converter always operates with a high conversion efficiency of ~10−5 W−1 which is ~103 times higher than that obtained from the surface of bulk GaAs. This nanoscale nolinear optical converter that simultaneously owns high efficiency and broad bandwidth may open a new way for application in imaging, bio-sensing and on-chip all-optical signal processing operations.
Highlights
Second harmonic generation (SHG) is a second-order nonlinear optical process in which an optical wave with frequency ω is converted into a second wave at a doubled frequency of 2ω
We present SHG from a single hexagonal GaAs NW that was measured using a homemade confocal microscope system
The experimental setup that was used to measure SHG from single GaAs NWs is described in greater detail in the Methods section
Summary
We present SHG from a single hexagonal GaAs NW that was measured using a homemade confocal microscope system. The SHG signal has a quadratic power dependence on the FW laser over the FW wavelength range, which indicates that this is a second-order nonlinear process. Most importantly, this broadband SHG process demonstrates wavelength insensitivity, which can be attributed www.nature.com/scientificreports/ Figure 4. This high-efficiency broadband SHG procedure based on a single NW may find applications in imaging, bio-sensing and on-chip all-optical signal and processing
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