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- W4296502633 abstract "The dual functionality of plasmonic light harvesting and barrier spacing between Au nanoparticles (NPs) and ZnO nanorod arrays (NRsA) are spotlighted to investigate their impact on the photoconversion and optical nonlinearity in the present study. The passivating Al2O3 barrier layer permits high-energy hot electron tunneling and injection from Au to the ZnO NRsA. The structural, vibrational, morphological/elemental, and optical properties of ZnO NRsA/a-Al2O3/Au were characterized by X-ray diffraction (XRD), Raman scattering, field emission scanning electron microscopy/energy dispersive X-ray spectroscopy (FE-SEM/EDX), and ultraviolet-visible-near IR (UV-Vis-near IR) absorption, respectively. The optoelectronic and nonlinear optical properties were analyzed by current-voltage measurement and z-scan tests under red laser (655 nm) irradiation, respectively. To highlight the effect of surface plasmon charge transport-based photosensing and photo-harvesting, the irradiated light source is selected to have a photon energy lower than the ZnO bandgap energy and detuning from LSPR. The transfer of photo-induced hot electrons from the Au NPs localized surface plasmon resonance (LSPR) to the ZnO NRsA translates into photocurrent generation in photosensing performance. The reverse saturable absorption process is changed to saturable absorption after intercalating the Al2O3 spacing layer into the ZnO NRsA/Au interface. The typical values of the nonlinear refraction index and absorption coefficient are calculated as n2 = +2.38 × 10-5 cm2 W-1 and β = -0.17 cm W-1 for the sandwiched ZnO NRsA/Al2O3/Au heterostructure, respectively. The sandwiched ZnO NRsA/amorphous Al2O3/Au heterostructure exhibits strong nonresonant optical nonlinearity, which has an excellent figure of merit for optical switching." @default.
- W4296502633 created "2022-09-21" @default.
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- W4296502633 date "2022-01-01" @default.
- W4296502633 modified "2023-09-28" @default.
- W4296502633 title "Dual functionality of surface plasmon resonance and barrier layer on the photosensing and optical nonlinearity of ZnO nanorod arrays" @default.
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- W4296502633 doi "https://doi.org/10.1039/d2cp03107h" @default.
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