Two-photon resonance assisted huge nonlinear refraction and absorption in ZnO thin films

Lin, Ja‐Hon; Chen, Yin-Jen; Lin, Hung-Yu; Hsieh, Wen–Feng

doi:10.1063/1.1848192

Cited by 94 publications

(55 citation statements)

References 22 publications

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“…revealed that ZnO gas sensors could respond to the visible light [1] produced by the two-photon excitation process [11,12] so that the visible light can be used as an excitation source. C.…”

Section: Photo-generated Free Charge Carriers In Lightenhanced Metal mentioning

confidence: 99%

Recent Trends of Light-enhanced Metal Oxide Gas Sensors: Review

Cho¹,

Park²

2016

Journal of Sensor Science and Technology

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Recent light-enhanced metal oxide gas sensors are reviewed in this article. The basic mechanisms of a light-enhanced metal oxide gas sensor are discussed. Many literatures reveal that the standalone sensitivity and the response/recovery time enhancements enabled by the exposing light are not as high as the performance enhancement provided by external heating. Therefore, both optimal amount of external heating and exposed light intensity are necessary to increase the performance of these light-enhanced gas sensors. The development of highly light sensitive materials and structures is important to lower the overall power consumptions of the sensors.

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Section: Photo-generated Free Charge Carriers In Lightenhanced Metal mentioning

confidence: 99%

Recent Trends of Light-enhanced Metal Oxide Gas Sensors: Review

Cho¹,

Park²

2016

Journal of Sensor Science and Technology

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“…This transition produces electron-hole pairs in the excited states and, subsequently, the band-edge emission via their radiative recombination [9]. The two photon absorption (2PA) in semiconductor nanocrystals (NCs) has been widely investigated [8,10], while the research effort on their three-photon absorption (3PA) is limited [11]. The three photon absorption was observed in ZnO and ZnS crystals when pump with lasers of ultra excitation irradiance which was more than 40 GW/cm 2 [12][13][14][15].…”

Section: Introductionmentioning

confidence: 99%

“…The optical and electrical properties of ZnO nanostructures are studied at different preparation techniques and at different substrate materials [5,6]. The pumping of ZnO crystalline nanofilm with near-infrared femtosecond radiation pulses, enhances the nonlinear interaction between the ultrahigh intensity applied optical field and the ZnO nanostructures [7,8]. The nonlinear interaction leads to the simultaneous absorption of two or more photons of subband gap energy.…”

Section: Introductionmentioning

confidence: 99%

Three-Photon Absorption in Zno Film Using Ultra Short Pulse Laser

Jamal¹,

Hussein²,

Suhail³

2012

JMP

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The three-photon absorption (3PA) in nanostructure wide-band gap ZnO semiconductor material is observed under high intensity femtosecond Titanium-Sapphire laser of 800 nm wavelength excitation. The ZnO film was prepared by chemical spray pyrolysis technique with substrate temperature of 400˚C. The optical properties concerning the absorption, transmission, reflection, Raman and the photoluminescence spectra are studied for the prepared film. The structure of the ZnO film was tested with the X-ray diffraction and it was found to be a polycrystalline with recognized peaks oriented in (002), and (102). The measured of three photon absorption coefficient was found to be about 0.0166 cm 3 /Gwatt 2 , which is about five times higher than the bulk value. The fully computerized z-scan system was used to measure the nonlinear coefficients from the Gaussian fit of the transmitted laser incident.

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“…[1][2][3] The nonlinear optical responses of ZnO were investigated to better understand the nonlinear optical properties, such as secondharmonic generation (SHG) and third-harmonic generation (THG). [4][5][6][7][8][9] The non-resonant two-photon absorption (2PA) and three-photon absorption (3PA) processes were also examined by monitoring the multiphoton-induced photoluminescence. 4,10 However, there are few reports on the simultaneous measurements of harmonic generation (SHG and THG) and multiphoton absorption (2PA and 3PA), 4,11 although the competition between them is important for potential applications.…”

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confidence: 99%

Second-harmonic Generation and Multiphoton Induced Photoluminescence in ZnO

Han¹,

Shim²,

Park³

et al. 2009

Bulletin of the Korean Chemical Society

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Among the II-VI semiconductors, zinc oxide (ZnO) has attracted considerable interest on account of its wide band gap (3.37 eV) and large exciton binding energy (60 meV).1-3 The nonlinear optical responses of ZnO were investigated to better understand the nonlinear optical properties, such as secondharmonic generation (SHG) and third-harmonic generation (THG). [4][5][6][7][8][9] The non-resonant two-photon absorption (2PA) and three-photon absorption (3PA) processes were also examined by monitoring the multiphoton-induced photoluminescence. 4,10 However, there are few reports on the simultaneous measurements of harmonic generation (SHG and THG) and multiphoton absorption (2PA and 3PA), 4,11 although the competition between them is important for potential applications. In this Communication, we present the nonlinear optical properties of ZnO, which were examined by the nonresonant optical excitation of femtosecond laser pulses at a wavelength of 800 nm.ZnO bulk powders ( Fig. 1(a)) were purchased from Aldrich (#205532) and employed for measurements without further purification and annealing. The ZnO powders were drop-coated on glass substrates and excited with a He-Cd laser (325 nm, Kimmon) to obtain the photoluminescence spectrum ( Fig. 1(b)). The emission peak in the UV region, which is attributed to exciton recombination, 1-3 is observed at 382 nm, while there is virtually no visible emission. Because the visible emission of ZnO is related to various defects, 1-3 the absence of visible emission suggests that this sample is suitable for a study of the nonlinear optical properties of ZnO without the perturbation of defects.For measurements of the nonlinear optical response, ZnO was excited by the fundamental of a cavity-dumped oscillator (Mira/PulseSwitch, Coherent, 1 MHz, 800 nm, 150 fs) using a UV microscope objective (LUCPLFLN40X, Olympus, NA 0.6). The emission and SHG were collected by the same objective, resolved spectrally using a monochromator (SP-2150i, Acton Research Corp.), and detected by a photomultiplier (P2/PD-471, Acton Research Corp.). Figure 1(c) clearly shows the SHG at 400 nm (twice the photon energy of 800 nm), while the THG near 267 nm is barely observable (inset of Fig. 1(c)). The other peak at 382 nm, in the blue side of the SHG, appears to be from another nonlinear optical response, because the photon energy of 382 nm is significantly different from that of 800 nm and its multiple. In order to understand the mechanism for UV emission, the emission spectra were obtained as a function of the excitation intensity of 800 nm ( Fig. 2(a)). UV emission and SHG increase nonlinearly with increasing excitation intensity, suggesting nonlinear optical responses. On the other hand, a closer examination reveals that the nonlinearity of UV emission is not identical to that of the SHG, which is observed more clearly in the normalized spectra ( Fig. 2(b)). The ratio of the UV to SHG emission increases with increasing excitation intensity. In other words, the intensity of UV emission increases fast compare...

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Two-photon resonance assisted huge nonlinear refraction and absorption in ZnO thin films

Cited by 94 publications

References 22 publications

Recent Trends of Light-enhanced Metal Oxide Gas Sensors: Review

Recent Trends of Light-enhanced Metal Oxide Gas Sensors: Review

Three-Photon Absorption in Zno Film Using Ultra Short Pulse Laser

Second-harmonic Generation and Multiphoton Induced Photoluminescence in ZnO

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