Sol–gel prepared Cu<sub>2</sub>O microspheres: linear and nonlinear optical properties

Karthikeyan, B.; Udayabhaskar, R.; Rose, T. Priya; Pandiyarajan, T.; Philip, Reji

doi:10.1039/c4ra05649c

Cited by 24 publications

(8 citation statements)

References 38 publications

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“…354−356 VO 2 composites and films were found to possess ultrafast nonlinearities 357 and enhanced absorption, 358,359 with capability to be used as optical power attenuators in the NIR range. 360−364 Some authors investigated the NLO properties of sizetunable monodispersed crystalline Cu 2 O microspheres, 365 prepared via sol−gel-based synthesis. The Z-scan measurements (532 nm, 5 ns pulses) revealed that the Cu 2 O microspheres behaved as optical limiters, and could be tuned systematically by varying the particle size.…”

Section: Nanocrystalsmentioning

confidence: 97%

See 1 more Smart Citation

Nonlinear Optical Materials for the Smart Filtering of Optical Radiation

2016

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The control of luminous radiation has extremely important implications for modern and future technologies as well as in medicine. In this Review, we detail chemical structures and their relevant photophysical features for various groups of materials, including organic dyes such as metalloporphyrins and metallophthalocyanines (and derivatives), other common organic materials, mixed metal complexes and clusters, fullerenes, dendrimeric nanocomposites, polymeric materials (organic and/or inorganic), inorganic semiconductors, and other nanoscopic materials, utilized or potentially useful for the realization of devices able to filter in a smart way an external radiation. The concept of smart is referred to the characteristic of those materials that are capable to filter the radiation in a dynamic way without the need of an ancillary system for the activation of the required transmission change. In particular, this Review gives emphasis to the nonlinear optical properties of photoactive materials for the function of optical power limiting. All known mechanisms of optical limiting have been analyzed and discussed for the different types of materials.

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Section: Nanocrystalsmentioning

confidence: 97%

“…Some authors investigated the NLO properties of size-tunable monodispersed crystalline Cu 2 O microspheres, prepared via sol–gel-based synthesis. The Z -scan measurements (532 nm, 5 ns pulses) revealed that the Cu 2 O microspheres behaved as optical limiters, and could be tuned systematically by varying the particle size.…”

Section: Inorganic Materialsmentioning

confidence: 99%

Nonlinear Optical Materials for the Smart Filtering of Optical Radiation

2016

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“…In general, β depends on population in the ground state. , In the present case, a variation in β with input fluence was observed. A strong ESA depletes the ground state population strongly, thereby rendering ESA coefficient fluence–dependent. , Therefore, the measured variation of β eff suggests that NLA seen for ns excitation has a critical contribution from ESA. , Induced thermal scattering (ITS) has an important role in the OL of several semiconducting and graphene based nanomaterials with ns excitation . For ultrashort (fs or ps) laser pulses ITS can be neglected since the thermal scattering centers form very slowly (ns).…”

Section: Resultsmentioning

confidence: 99%

“…A strong ESA depletes the ground state population strongly, thereby rendering ESA coefficient fluence−dependent. 57,58 Therefore, the measured variation of β eff suggests that NLA seen for ns excitation has a critical contribution from ESA. 59,60 Induced thermal scattering (ITS) has an important role in the OL of several semiconducting and graphene based nanomaterials with ns excitation.…”

Section: Xps Analysismentioning

confidence: 88%

Tunable Nanosecond and Femtosecond Nonlinear Optical Properties of C–N–S-Doped TiO₂ Nanoparticles

et al. 2017

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Third-order nonlinear optical (NLO) properties of undoped and C–N–S doped TiO2 nanoparticles (NPs) were investigated using the Z-scan technique in the nanosecond (ns) and femtosecond (fs) regimes. Undoped TiO2 NPs exhibited reverse saturable absorption (RSA) behavior with both ns and fs laser pulse excitation, whereas C–N–S-doped TiO2 NPs demonstrated switch over from RSA to saturable absorption (RSA → SA) behavior with fs excitation. Our detailed NLO studies have clearly demonstrated the tunable nonlinear absorption behavior of C–N–S-doped TiO2 NPs. Such versatile tunability is important for various practical applications. The interesting nonlinear absorption (NLA) properties of these NPs are attributed to the interplay between ground and excited state absorption of the free carriers. The results obtained with ns laser excitation demonstrated that the nonlinear absorption coefficient (β) and nonlinear refractive index (n 2) for these materials varied with input irradiance, thus indicating the possibility of higher order nonlinearity (free–carrier effect) occurrence rather than third-order nonlinearity alone. C–N–S-doped TiO2 nanoparticles exhibited large magnitude for β and n 2 with values of 2.1 × 10–10 m/W and 15.4 × 10–17 m2/W, respectively, with ns excitation. Further, the samples were tested for nonlinearity with continuous wave (cw) excitation as heat-induced refractive index changes were observed for the samples with cw laser excitation at 532 nm. The room temperature ferromagnetism (RTFM) was observed in both undoped and C–N–S doped TiO2 NPs. Undoped rutile TiO2 exhibited ∼6.9-fold enhancement in RTFM as compared to the anatase phase of C–N–S-doped TiO2 NPs.

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“…Another interesting application of copper oxides is their use as optical limiters. The only optical limiting applications for copper oxide nanostructures reported to date are in our recent work and in a few other reports that emphasized copper oxide nanospheres or thin films [3,8,[10][11][12][13]. Therefore, towards a solution for enhancement of optical limiting performance, we introduce copper oxide nanostructures formed under three different anodization conditions.…”

Section: Introductionmentioning

confidence: 98%