Journal
NANO LETTERS
Volume 15, Issue 3, Pages 1564-1569Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nl503984b
Keywords
Second-harmonic generation; semiconductor; radial polarization; nonlinear imaging; modeling
Categories
Funding
- Academy of Finland [134973, 267847]
- TUT [2014 (84010)]
- MOPPI project of Aalto Energy Efficiency Research Programme
- TEKES FiDiPro NP-Nano project
- graduate school of TUT
- Academy of Finland through its Centers of Excellence Programme [251748]
- European Research Council [ERC-2013-AdG-340748-CODE]
- Academy of Finland (AKA) [134973, 134973] Funding Source: Academy of Finland (AKA)
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We use second-harmonic generation (SHG) with focused vector beams to investigate individual vertically aligned GaAs nanowires. Our results provide direct evidence that SHG from oriented nanowires is mainly driven by the longitudinal field along the nanowire growth axis. Consequently, focused radial polarization provides a superior tool to characterize such nanowires compared to linear polarization, also allowing this possibility in the native growth environment. We model our experiments by describing the SHG process for zinc-blende structure and dipolar bulk nonlinearity.
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