Intensity dependent nonlinear absorption switching behavior of electrospun meta-nitroaniline nanofiber

Yogeswari, C.; Hijas, K.M.; Girisun, T.C. Sabari; Nagalakshmi, R.

doi:10.1016/j.optmat.2020.109691

Cited by 13 publications

(5 citation statements)

References 40 publications

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“…From the spectrum shown in figure 5(a), it may be noted that beyond 400 nm, no significant absorption is observed that confirms the suitability of 5C2NA for NLO applications [37]. It agrees with the literature that the absorption below 420 nm confirms the presence of aniline derivatives [38].…”

Section: Linear Optical Analysissupporting

confidence: 86%

Broadband terahertz absorption and Q-switching behavior of 5-chloro-2-nitroaniline (5C2NA) crystals

Singh,

Pramod

et al. 2024

J. Opt.

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Growth of transparent 5-chloro-2-nitroaniline (5C2NA) crystals was achieved through the slow evaporation technique. Analysis via X-ray diffraction (XRD) and Fourier Transform Infrared (FTIR) spectroscopy confirmed the crystalline nature of the organic crystals and revealing distinct molecular fingerprints of 5C2NA respectively. UV-VIS and Photoluminescence (PL) spectroscopy were employed to study the material's band gap and ground state absorption respectively. Thermogravimetric analysis (TGA) analysis indicated the stability of the grown crystals up to 211ºC. Dielectric measurements and Urbach plot suggested the presence of fewer defects in 5C2NA crystals. Time domain terahertz spectroscopy was utilized to observe the variation of absorption coefficient and refractive index in the terahertz frequency regime. Nonlinear optical effects such as saturable absorption (SA) and reverse saturable absorption (RSA), are pivotal in the development of all-optical logic gates. The transition between SA and RSA possesses a significant importance in optoelectronic applications. In this study, we investigate the 5C2NA crystal, revealing its ability to exhibit both SA and RSA under Z scan technique with varying pump intensities. The switching properties observed in 5C2NA can be harnessed for applications such as all-optical logic gates, rapid optical switching, optical limiting, mode storage, and more.

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Section: Linear Optical Analysissupporting

confidence: 86%

Broadband terahertz absorption and Q-switching behavior of 5-chloro-2-nitroaniline (5C2NA) crystals

Singh,

Pramod

et al. 2024

J. Opt.

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“…This means that the PA 6 nanofibers can be more easily saturated at long excitation wavelength, which is favorable for Q‐switching and mode‐locking applications of infrared lasers. Yogeswari et al reported the nonlinear absorption coefficients of electropun meta‐nitroaniline nanofibers as 8.20 x 10 −10 m/W at 0.246 x 10 12 W/cm 2 input intensity with 532 nm and 4 ns laser source 63 . Yogeswari et al also investigated Potassium Dihydrogen Phosphate (KDP)–Polyethylene Oxide (PEO) nonlinear optical behavior and they reported the nonlinear absorption coefficient as 3.48 x 10 −10 m/W at 2.47 x 10 12 W/m 2 input intensity with 1064 nm and 5 ns laser source 64 .…”

Section: Resultsmentioning

confidence: 99%

“…Yogeswari et al reported the nonlinear absorption coefficients of electropun meta-nitroaniline nanofibers as 8.20 x 10 À10 m/W at 0.246 x 10 12 W/cm 2 input intensity with 532 nm and 4 ns laser source. 63 Yogeswari et al also investigated Potassium Dihydrogen Phosphate (KDP)-Polyethylene Oxide (PEO) nonlinear optical behavior and they reported the nonlinear absorption coefficient as 3.48 x 10 À10 m/W at 2.47 x 10 12 W/ m 2 input intensity with 1064 nm and 5 ns laser source. 64 Compared to aforementioned values reported for organic nanofibers in the literature, the nonlinear absorption coefficients of PA 6 nanofibers are a hundred times higher in spite of smaller input intensity.…”

Section: Nonlinear Optical Analysismentioning

confidence: 99%

Morphology, defects and polymer concentration related nonlinear absorption and optical limiting properties of electrospun polyamide 6 nanofibers

Pepe

Akkoyun

Karatay

et al. 2022

J of Applied Polymer Sci

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The effects of morphology, defects and polymer concentration on nonlinear absorption characteristics of electrospun polyamide 6 (PA 6) nanofibers were studied systematically. Scanning electron microscopy measurements showed that a deviation from uniform nanofibers to irregular cob-web nanofibers morphology occurred with increasing PA 6 concentration and fiber diameter. Open aperture Z-scan results indicated that the thinner uniform PA 6 nanofibers present higher nonlinear absorption. This observation is mainly attributed to a greatest light scattering for thicker uniform nanofibers, considering the linear optical analysis of the PA 6 nanofibers. As a secondary factor, this could be associated with defect state distribution within the band gap, which facilitates the contribution of two photon absorption (TPA) and free carrier absorption (FCA) to nonlinear absorption. Moreover, the thinner uniform nanofibers exhibit higher optical limiting behavior. Polyamide 6 nanofibers attract more attention for biomedical applications due to their good biocompatibility. However, to our knowledge, no study exists on PA 6 nanofibers nonlinear optical properties and their dependency on nanofiber morphology. Therefore, in line with the reported results, this report reveals that PA 6 nanofibers are a promising material for optoelectronic applications as well as biomedical applications.

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“…RSA is a required property for photonic applications like optical switching, optical rectification, laser pulse shaping, and compression. 15,16 To produce efficient RSA with nanosecond laser pulses, the lowest triplet state should have a long lifetime, a strong absorption coefficient, and a high quantum yield. For practical applications, the broadband RSA materials are also required to cover the spectral range of 500-900 nm.…”

Section: Introductionmentioning

confidence: 99%

Combined Machine Learning, Computational and Experimental Analysis of the Iridium(III) Complexes with Red to Near-IR Emission

Karuth

Casañola-Martín

Lystrom

et al. 2022

Preprint

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Various coordination complexes have been the subject of experimental or theoretical studies in recent decades because of their fascinating photophysical properties. In this work a combined experimental and computational approach applied to investigate the optical properties of monocationic Ir(III) complexes. In result, an interpretative machine learning-based Quantitative Structure-Activity Relationship (QSAR) model was successfully developed, which can reliably predict the emission wavelength of the Ir(III) complexes and provides foundations for theoretical evaluation of the optical properties of Ir(III) complexes. A hypothesis was proposed to mechanistically explain the differences in emission wavelengths between structurally different individual Ir(III) complexes. To the best of our knowledge, this is the first attempt to develop predictive machine learning (QSAR) model for the optical properties of Ir(III) complexes. The efficacy of the developed model was demonstrated by high R2 values for the training and test sets of 0.84 and 0.87, respectively, and by performing the validation using y-scrambling techniques. A notable relationship between the N-N distance in the diimine ligands of the Ir(III) complexes and emission wavelengths was revealed. This combined experimental and computational approach shows a great potential for rational design of new Ir(III) complexes with desired optical properties. Moreover, the developed methodology could be extended to other octahedral transition-metal complexes.

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Intensity dependent nonlinear absorption switching behavior of electrospun meta-nitroaniline nanofiber

Cited by 13 publications

References 40 publications

Broadband terahertz absorption and Q-switching behavior of 5-chloro-2-nitroaniline (5C2NA) crystals

Broadband terahertz absorption and Q-switching behavior of 5-chloro-2-nitroaniline (5C2NA) crystals

Morphology, defects and polymer concentration related nonlinear absorption and optical limiting properties of electrospun polyamide 6 nanofibers

Combined Machine Learning, Computational and Experimental Analysis of the Iridium(III) Complexes with Red to Near-IR Emission

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