Nonlinear optical techniques for characterization of organic electronic and photonic devices

Ahmed, Md Soif; Biswas, Chinmoy; Miranda, Paulo B.; Raavi, Sai Santosh Kumar

doi:10.1140/epjs/s11734-021-00391-8

“…The value of n 2 for the sample varies as a result of the strong laser beam present in the system. 56 The nonlinear refractive index is related to the nonlinear on-axis phase shift 28 as follows:Δ Φ = kI 0 n 2 L eff ,where I 0 is the peak intensity of the incident laser beam, k = 2π/ λ is the wave vector, and L eff is the effective length of the sample. For all of our investigated Pc samples, valley-peak shapes were observed for the CA data as shown in Fig.…”

Section: Resultsmentioning

confidence: 99%

Novel metallated imidazole phthalocyanines: synthesis, ultrafast excited-state carrier dynamics and multiphoton absorption properties

Ahmed,

Srivishnu,

Biswas

et al. 2023

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“…As the intense laser beam is present in the nonlinear medium, the nonlinear refractive (NLR) index ( n 2 ) comes into picture and it alters the refractive index of the medium. 71 The following relationship 72 exists between the nonlinear phase shift and the nonlinear refractive index:Δ Φ = kI 0 n 2 L eff ,where k = 2π/ λ is the wave vector, I 0 is the peak intensity of the incident laser beam at the focus, and L eff represents the effective path length inside the sample. Fig.…”

Section: Resultsmentioning

confidence: 99%

“…As the intense laser beam is present in the nonlinear medium, the nonlinear refractive (NLR) index (n 2 ) comes into picture and it alters the refractive index of the medium. 71 The following relationship 72 exists between the nonlinear phase shift and the nonlinear refractive index:…”

Section: Femtosecond Z-scan Toward Nlo Applicationsmentioning

confidence: 99%

Tunable near-infrared emission and three-photon absorption in lanthanide-doped double perovskite nanocrystals

Md

¹

,

Lavadiya

²

,

Nayak

³

et al. 2023

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“…From the fitted curve, we primarily obtained the on-axis nonlinear phase shift at the focus ΔΦ. Again, due to the presence of intense laser beam in the third-order NLO medium, the nonlinear refractive index (n 2 ) comes into the picture to modify the refractive index of the medium (47). The relationship between the non-linear phase shift and the non-linear refractive index is expressed as…”

Section: Closed-aperture Z-scanmentioning

confidence: 99%

Femtosecond Third-Order Non-Linear Optical Properties of Unconstrained Green Fluorescence Protein Chromophores

Ahmed

¹

,

Biswas

²

,

Banerjee

³

et al. 2022

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We report herein results on the third-order non-linear optical (NLO) properties of four structurally unconstrained green fluorescence protein (GFP) chromophores, namely, 1, 2, 3, and 4. Using experimental techniques and theoretical calculations such as UV–visible spectroscopy, density functional theory (DFT), time-dependent density functional theory (TDDFT), and Z-scan techniques, we have investigated the linear absorption, ultrafast non-resonant third-order optical non-linearities, and the onset of optical-limiting thresholds of these benzylidenedimethylimidazolinone (BDI) dyes. The Z-scan measurements were performed at a wavelength of 800 nm with ∼70 femtosecond (fs) pulses. We have witnessed a strong reverse saturable absorption (fitted to three-photon absorption) for all of the molecules with fs pulse excitation. The valley–peak curves obtained from the closed-aperture Z-scan technique revealed the positive non-linear refractive index (self-focusing) nature of these molecules. We have evaluated the various third-order NLO coefficients (second hyperpolarizability, γ ∼10–33 esu), which were found to be larger than those of similar molecules reported in the recent literature.

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Nonlinear optical techniques for characterization of organic electronic and photonic devices

Cited by 15 publications

References 64 publications

Novel metallated imidazole phthalocyanines: synthesis, ultrafast excited-state carrier dynamics and multiphoton absorption properties

Novel metallated imidazole phthalocyanines: synthesis, ultrafast excited-state carrier dynamics and multiphoton absorption properties

Tunable near-infrared emission and three-photon absorption in lanthanide-doped double perovskite nanocrystals

Femtosecond Third-Order Non-Linear Optical Properties of Unconstrained Green Fluorescence Protein Chromophores

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