Saturable and reverse saturable absorption of a Cu2O–Ag nanoheterostructure

Saad, Nabil A.; Dar, Mudasir H.; Ramya, E.; Naraharisetty, Sri Ram G.; Rao, D. Narayana

doi:10.1007/s10853-018-2811-5

Cited by 33 publications

(4 citation statements)

References 71 publications

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“…Figure 6 shows the OA Z-scan traces of the ZnONPs colloids, in which all of the curves show a valley that is induced by reverse-saturable absorption (RSA) behavior (i.e., positive nonlinear absorption coefficient) that agrees with the results in [ 51 , 63 ]. The reason for the RSA behavior may be three-photon absorption (3PA), free carriers’ absorption, excited-state absorption, nonlinear scattering, or a combination of these processes [ 64 ]. According to the bandgaps of the two samples, it is reasonable to assume that 3PA occurs, which induces the nonlinear absorption process.…”

Section: Resultsmentioning

confidence: 99%

“…

increases with an increasing incident laser peak intensity. This is because increasing the laser intensity increases the number of excited electrons in the conduction band (3PA), which thus increases the probability of free-carrier absorption [ 64 ]. It is also noticeable that the

of 13 mg/L is higher than that of 5 mg/L, reaching 289 × 10 −22 cm 3 /W 2 and 497 × 10 −22 cm 3 /W 2 , respectively.…”

Section: Resultsmentioning

confidence: 99%

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Nonlinear Optical Properties of Zinc Oxide Nanoparticle Colloids Prepared by Pulsed Laser Ablation in Distilled Water

et al. 2022

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The nonlinear optical properties of zinc oxide nanoparticles (ZnONPs) in distilled water were measured using a femtosecond laser and the Z-scan technique. The ZnONPs colloids were created by the ablation of zinc bulk in distilled water with a 532 nm Nd: YAG laser. Transmission electron microscopy, an ultraviolet-visible spectrophotometer, and atomic absorption spectrophotometry were used to determine the size, shape, absorption spectra, and concentration of the ZnONPs colloids. The nonlinear absorption coefficient and nonlinear refractive index were measured at different excitation wavelengths and intensities. The nonlinear absorption coefficient of the ZnONPs colloids was found to be positive, caused by reverse saturable absorption, whereas the nonlinear refractive index was found to be negative due to self-defocusing in the ZnONPs. Both laser parameters, such as excitation wavelength and input intensity, and nanoparticle features, such as concentration and size, were found to influence the nonlinear optical properties of the ZnONPs.

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Section: Resultsmentioning

confidence: 99%

“…

of 13 mg/L is higher than that of 5 mg/L, reaching 289 × 10 −22 cm 3 /W 2 and 497 × 10 −22 cm 3 /W 2 , respectively.…”

Section: Resultsmentioning

confidence: 99%

Nonlinear Optical Properties of Zinc Oxide Nanoparticle Colloids Prepared by Pulsed Laser Ablation in Distilled Water

et al. 2022

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“…The optical limiting behavior was affected by strong nonlinear refraction. [ 72,73 ] The V 2 O 5 thin film annealed at 450 ºC had a low optical limiting threshold—in other words, higher optical limiting due to its higher β eff and n 2 . The investigated thin films had 10 3 times higher optical limiting than that of reported values of Na‐doped V 2 O 5 nanoparticles.…”

Section: Resultsmentioning

confidence: 99%

Thermally Induced Phase Transition and Defect‐Assisted Nonlinear Absorption and Optical Limiting in Nanorod Morphology V₂O₅ Thin Films

et al. 2021

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Materials possessing nonlinear and saturable absorptions received significant interest due to their applicability in various novel technological applications such as optical limiting, Q-switching, upconversion lasing, and mode locking. [1][2][3][4] Nonlinear optical properties of materials like nonlinear and saturable absorptions are highly affected by localized defect states that alter the bandgap energy (E g ) in the structure. These states could be altered by changing the thickness of the material, doping the material, and heat treatment and can be filled by one-photon absorption (OPA), two-photon absorption (TPA), and free carrier absorption (FCA) mechanisms. [5][6][7][8][9][10] Among these mechanisms, TPA is the dominant mechanism when a laser energy between E g /2 and E g is used.Recent studies on transition metal oxides revealed their potential for novel photonic devices using their nonlinear optical properties. [11][12][13][14][15] Among the other transition metal oxides, V 2 O 5 is one the most stable and easily synthesized material. [16,17] Various morphologies of the V 2 O 5 thin films about transition from semiconductor-to-metallic phase (SMT) were reported at a transition temperature of 257 C. [18,19] V 2 O 5 thin films can be easily deposited onto different substrates using diverse techniques such as thermal evaporation, [20] pulsed laser deposition, [21][22][23] magnetron sputtering, [24,25] chemical vapor deposition, [26][27][28][29] sol-gel process, [30,31] ultrasonic spray deposition (USD), [32] and spray pyrolysis. [33][34][35] Among all of the deposition techniques, the USD method is highly promising as it allows effective material utilization, relatively low deposition cost, and deposition under atmospheric conditions. Typical applications of V 2 O 5 thin films include but are not limited to gas sensors, [36,37] catalysis, [38] electrochromics, [39,40] and optoelectronic applications. [41] Although there are numerous studies on the diverse properties of V 2 O 5 in the literature, [42][43][44][45][46][47] in contrast, only a few studies reported the nonlinear optical properties of V 2 O 5 . Nonlinear absorption characteristics of V 2 O 5 and Na-doped V 2 O 5 nanoparticles prepared by solution combustion were investigated by Molli et al. and Pradhan et al., respectively. [48,49] Mousavi et al. reported third-order nonlinear optical properties of V 2 O 5 nanoparticles doped with Co, [50] and Ravinger et al. reported thickness-dependent nonlinear absorption characteristics of the V 2 O 5 thin films produced by sol-gel. [51] In this work, the effects of annealing on nonlinear absorption, nonlinear refractive, and optical limiting behaviors of ultrasonic

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“…(3) is T0 = exp(-α0L) ≈ 60%, and the layer can be assumed as semiopaque. The saturation intensity of the linear absorption coefficient for Cu2O is Is ~ 0.1 TW/cm 2 [23], thus, the semi-opaque oxide layer suddenly becomes fully transparent, when peak intensities exceed the saturation intensity. However, by further increasing intensity the nonlinear absorption becomes dominant and the oxide layer changes to opaque again.…”

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confidence: 99%

Influence of nonlinear and saturable absorption on laser lift-off threshold of an oxide/metal structure

et al. 2020

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In this work, a new model of effective lift-off threshold of oxide/metal target is presented. The influence of nonlinear processes in the oxide layer on its removal from the metallic samples using picosecond laser was investigated. Nonlinear and saturable absorption in the layer was incorporated into modeling for prediction of effective laser lift-off threshold fluence change with varying peak intensities in z-scan type experiment for the first time. The new model coincides well with the experimental results.

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Saturable and reverse saturable absorption of a Cu2O–Ag nanoheterostructure

Cited by 33 publications

References 71 publications

Nonlinear Optical Properties of Zinc Oxide Nanoparticle Colloids Prepared by Pulsed Laser Ablation in Distilled Water

Nonlinear Optical Properties of Zinc Oxide Nanoparticle Colloids Prepared by Pulsed Laser Ablation in Distilled Water

Thermally Induced Phase Transition and Defect‐Assisted Nonlinear Absorption and Optical Limiting in Nanorod Morphology V₂O₅ Thin Films

Influence of nonlinear and saturable absorption on laser lift-off threshold of an oxide/metal structure

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Saturable and reverse saturable absorption of a Cu2O–Ag nanoheterostructure

Cited by 33 publications

References 71 publications

Nonlinear Optical Properties of Zinc Oxide Nanoparticle Colloids Prepared by Pulsed Laser Ablation in Distilled Water

Nonlinear Optical Properties of Zinc Oxide Nanoparticle Colloids Prepared by Pulsed Laser Ablation in Distilled Water

Thermally Induced Phase Transition and Defect‐Assisted Nonlinear Absorption and Optical Limiting in Nanorod Morphology V2O5 Thin Films

Influence of nonlinear and saturable absorption on laser lift-off threshold of an oxide/metal structure

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Thermally Induced Phase Transition and Defect‐Assisted Nonlinear Absorption and Optical Limiting in Nanorod Morphology V₂O₅ Thin Films