Surface plasmon-enhanced two-photon excited whispering-gallery modes ultraviolet laser from Zno microwire

Wang, Yunpeng; Zhu, Gangbei; Mei, Jingjing; Tian, Cancan; Liu, Hongzhen; Wang, Fei; Zhao, Dongxu

doi:10.1063/1.5008768

Cited by 7 publications

(3 citation statements)

References 15 publications

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“…With a direct band gap and high exciton binding energy values of 3.3 eV and 60 meV, respectively, the transparent n-type semiconductor zinc oxide (ZnO) has demonstrated use for numerous electronic, electrochemical, optoelectronic, and electromechanical devices [1,2,3,4], including light-emitting diodes [5], piezoelectric nanogenerators [6], field emission devices [7], high-performance nanosensors [8,9], solar cells [10,11], and ultraviolet (UV) lasers [12]. Due to their high surface-to-volume ratio and surface area, the ZnO nanostructures with zero- (quantum dots and ultrafine nanoparticles), one- (tubes, rods, belts, and wires), or two-dimensional morphology (sheets, flakes, and thin films) offer superior performance attributes than those of bulk ZnO structures.…”

Section: Introductionmentioning

confidence: 99%

Orange/Red Photoluminescence Enhancement Upon SF6 Plasma Treatment of Vertically Aligned ZnO Nanorods

et al. 2019

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Although the origin and possible mechanisms for green and yellow emission from different zinc oxide (ZnO) forms have been extensively investigated, the same for red/orange PL emission from ZnO nanorods (nR) remains largely unaddressed. In this work, vertically aligned zinc oxide nanorods arrays (ZnO nR) were produced using hydrothermal process followed by plasma treatment in argon/sulfur hexafluoride (Ar/SF6) gas mixture for different time. The annealed samples were highly crystalline with ~45 nm crystallite size, (002) preferred orientation, and a relatively low strain value of 1.45 × 10−3, as determined from X-ray diffraction pattern. As compared to as-deposited ZnO nR, the plasma treatment under certain conditions demonstrated enhancement in the room temperature photoluminescence (PL) emission intensity, in the visible orange/red spectral regime, by a factor of 2. The PL intensity enhancement induced by SF6 plasma treatment may be attributed to surface chemistry modification as confirmed by X-ray photoelectron spectroscopy (XPS) studies. Several factors including presence of hydroxyl group on the ZnO surface, increased oxygen level in the ZnO lattice (OL), generation of F–OH and F–Zn bonds and passivation of surface states and bulk defects are considered to be active towards red/orange emission in the PL spectrum. The PL spectra were deconvoluted into component Gaussian sub-peaks representing transitions from conduction-band minimum (CBM) to oxygen interstitials (Oi) and CBM to oxygen vacancies (VO) with corresponding photon energies of 2.21 and 1.90 eV, respectively. The optimum plasma treatment route for ZnO nanostructures with resulting enhancement in the PL emission offers strong potential for photonic applications such as visible wavelength phosphors.

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Section: Introductionmentioning

confidence: 99%

Orange/Red Photoluminescence Enhancement Upon SF6 Plasma Treatment of Vertically Aligned ZnO Nanorods

et al. 2019

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“…Until now, highly enhanced near band-edge (NBE) emission, − miniaturized plasmonic nanolasers, , low lasing threshold, − and single-mode lasing − have been achieved. Propagating surface plasmon polaritons can break the diffraction limit and reduce the lasing threshold, but an ultra-flat interface between the metal and dielectric material is normally required to decrease the scattering loss and promote the exciton-SP energy transfer. − For nanowire-based whispering-gallery-mode (WGM) nanolasers, localized surface plasmon (LSP) is normally introduced by capping metal nanoparticles ,, by covering graphene on the surface of nanowires , or by dispersing nanowires on rough metal films. , However, as WGM nanocavity, most of the investigated nanowires are still much thicker than the subwavelength scale in diameter to date. Quite a few studies investigate the WGM resonance performance in semiconductor nanowires with diameters down to subwavelength scale, , which may be due to the degraded optical mode confinement.…”

Section: Introductionmentioning

confidence: 99%

“…Propagating surface plasmon polaritons can break the diffraction limit and reduce the lasing threshold, but an ultra-flat interface between the metal and dielectric material is normally required to decrease the scattering loss and promote the exciton-SP energy transfer. 13−15 For nanowire-based whispering-gallerymode (WGM) nanolasers, localized surface plasmon (LSP) is normally introduced by capping metal nanoparticles 17,19,21 by covering graphene on the surface of nanowires 8,18 or by dispersing nanowires on rough metal films. 16,22 However, as WGM nanocavity, most of the investigated nanowires are still much thicker than the subwavelength scale in diameter to date.…”

Section: Introductionmentioning

confidence: 99%

Surface Plasmon Enhanced Exciton Transitions, Cavity Resonance Effects, and Exciton–/Polariton–LO Phonon Interactions in ZnO Nanowires

et al. 2020

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Optical properties of single-subwavelength ZnO nanowires are highly improved by the Al 2 O 3 layer/rough Ag film plasmonic structure as a substrate, owing to the exciton−surface plasmon (SP) interactions. The ZnO nanowire luminescence efficiency was enhanced on the Al 2 O 3 layer/rough Ag film as compared with the SiO 2 /Si substrate. The exciton transitions can be highly enhanced with narrow linewidth and distinguished clearly above 80 K. Typically, three different bound exciton transitions originating from different impurities as trap centers can be identified at 80 K and traced clearly before thermal dissociation. Meanwhile, the strong local electromagnetic field induced by SP can enhance the whispering-gallery-mode (WGM) resonance and the exciton−/exciton−polariton (polariton for short)−longitudinal optical (LO) phonon interaction. The formation of WGM polaritons with energy in the region of first-order LO phonon replica is efficiently promoted by polariton−LO phonon scattering relaxation. These findings provide an effective method for designing novel semiconductor-nanostructure luminescence or lasing devices in future.

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Plasma etched Ag nanospheres for large increases of ZnO fluorescence emission: A combined theoretical-experimental study

Chen

et al. 2023

Ceramics International

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Surface plasmon-enhanced two-photon excited whispering-gallery modes ultraviolet laser from Zno microwire

Cited by 7 publications

References 15 publications

Orange/Red Photoluminescence Enhancement Upon SF6 Plasma Treatment of Vertically Aligned ZnO Nanorods

Orange/Red Photoluminescence Enhancement Upon SF6 Plasma Treatment of Vertically Aligned ZnO Nanorods

Surface Plasmon Enhanced Exciton Transitions, Cavity Resonance Effects, and Exciton–/Polariton–LO Phonon Interactions in ZnO Nanowires

Plasma etched Ag nanospheres for large increases of ZnO fluorescence emission: A combined theoretical-experimental study

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