Observation of both second-harmonic and multiphoton-absorption-induced luminescence in ZnO

Abstract

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Inner surface enhanced femtosecond second harmonic generation in thin ZnO crystal tubes

“…However, relatively weak SHG emission to the band edge emission was observed in singlecrystal ZnO bulk. 14 In this paper, an extraordinary strong SHG emission compared to the band edge emission was observed in a thin ZnO hollow crystal rod under the excitation of femtosecond laser from 700 to 860 nm at room temperature. The distinct hollow geometric structure of the sample is believed to be responsible for this enhanced SHG emission.…”

“…1 Most of the previous works about the optical properties of ZnO with various morphologies were conducted in the linear area. [2][3][4][5] More recently, the nonlinear optical properties of ZnO, for instance, second harmonic generation ͑SHG͒, 6-10 third harmonic generation, 11,12 and multiphoton absorption ͑MPA͒ induced luminescence, [13][14][15] have been investigated. However, relatively weak SHG emission to the band edge emission was observed in singlecrystal ZnO bulk.…”

Ion-implantation induced nano distortion layer and its influence on nonlinear optical properties of ZnO single crystals

“…The excitation beam was originally linear polarized in the vertical direction. Because of the relatively strong band-edge emission under two-photon excitation, 10 the wavelength of the excitation beam was chosen as $840 nm. During the SHG measurements, the power of the excitation beam was kept as a constant ($400 mW) by using a neutral metallic filter.…”

“…[4][5][6][7][8] As a standard second-order nonlinear optical process, second harmonic generation (SHG) has been increasingly studied in ZnO bulk crystals and nanostructures. [9][10][11][12][13] However, to the best of our knowledge, there have been no reports about the study of nonlinear optical properties and X-ray diffraction (XRD) rocking curves of ionimplanted ZnO single crystals. In this article, we fill in this gap by presenting an interesting investigation on nonlinear optical properties of ZnO single crystals implanted by He, Cu, and Zn ions.…”

Efficient upconversion of photoluminescence via two-photon absorption in bulk and nanorod ZnO

“…in nano-lasers) to be implemented in novel photonic circuits. A lack of inversion symmetry inherent to wurtzite crystal lattice of ZnO facilitates strong nonlinear optical effects in this material such as second-harmonic generation [7][8][9][10] and twophoton-absorption (TPA) [11][12][13][14][15]. The latter process often leads [10] to PL upconversion, i.e.…”