Nonlinear optical dispersion and higher-order effects in bulk and wavelength-ordered photonic materials

Acharyya, Jitendra Nath; Prakash, G. Vijaya

doi:10.1016/j.ijleo.2021.167944

Cited by 8 publications

(14 citation statements)

References 43 publications

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“…The CA Z-scan traces are represented in Figure for all of the synthesized porphyrins. All CA scans exhibit a valley-peak configuration curve suggesting a positive nonlinear refractive index of pure Kerr-type electronic origin. , The Kerr nonlinearity is responsible for the self-focusing effect that arises from the high intensity of femtosecond laser pulse propagation. ,, The nonlinear refractive index ( n 2 ) and Re. χ (3) data are tabulated in Table .…”

Section: Resultsmentioning

confidence: 63%

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Unsymmetrically β-Functionalized π-Extended Porphyrins: Synthesis, Spectral, Electrochemical Redox Properties, and Their Utilization as Efficient Two-Photon Absorbers

et al. 2022

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Two new series of unsymmetrically β-functionalized porphyrins, MTPP(NO 2 )MA (1M), (MA = methyl acrylate) and MTPP(NO 2 )MB (2M) (MB = mono-benzo) (where M = 2H, Co(II), Ni(II), Cu(II) and Zn(II)), were synthesized and characterized by various spectroscopic techniques. The saddle shape conformation of ZnTPP(NO 2 )MAPy and ZnTPP(NO 2 )MB was confirmed by single-crystal X-ray analysis. Density functional theory (DFT) calculation revealed that NiTPP(NO 2 )MB has a severe nonplanar geometry possessing a high magnitude of ΔC β = ±0.727 Å and Δ24 = ±0.422 Å values among all other porphyrins. Synthesized β-substituted porphyrins exhibited red-shifted B-and Q-bands corresponding to their parent molecule due to the electron-withdrawing peripheral substituents. Notable redshift (Δλ max = 50−60 nm) in electronic spectral features and with weakintensity emission spectral features were observed for the free-base porphyrins and Zn(II) complexes compared to H 2 TPP and ZnTPP, respectively. The first-ring reduction potential of MTPP(NO 2 )MA (1M) exhibited 0.21−0.5 V anodic shift, whereas 0.18− 0.23 V anodic shift was observed in the first-ring oxidation potential compared to the corresponding MTPPs due to the presence of electron-withdrawing β-substituents at the periphery of the macrocycle. Interestingly, NiTPP(NO 2 )MA (1Ni) has shown an additional Ni II /Ni III oxidation potential observed at 2.05 V along with two ring-centered oxidations. The first-ring reduction and oxidation potentials of MTPP(NO 2 )MB (2M) have shown 0.39−0.46 and 0.19−0.27 V anodic shifts with respect to their corresponding MTPPs. The nonlinear optical (NLO) properties of all of the porphyrins were investigated, and the extracted nonlinear optical parameters revealed intense reverse-saturable absorption (RSA) behavior and the self-focusing behavior with positive nonlinear refractive index in the range of (0.19−1.75) × 10 −17 m 2 /W. Zn(II) complexes exhibited the highest two-photon absorption coefficient (β) and cross section (σ TPA ) of ∼95 × 10 −12 m/W and 19.66 × 10 4 GM, respectively, among all of the metal complexes.

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Section: Resultsmentioning

confidence: 63%

“…94,101 The Kerr nonlinearity is responsible for the self-focusing effect that arises from the high intensity of femtosecond laser pulse propagation. 94,102,103 The nonlinear refractive index (n 2 ) and Re. χ (3) data are tabulated in Table 3.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

Unsymmetrically β-Functionalized π-Extended Porphyrins: Synthesis, Spectral, Electrochemical Redox Properties, and Their Utilization as Efficient Two-Photon Absorbers

et al. 2022

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“…The extraordinary nonlinear optical (NLO) properties of porphyrins make them potential candidates for the application in optics and photonics devices. At a higher laser intensity, the material's absorption ( α ) and refractive index ( n ) follow the intensity-dependent variations as follows: 61–63 α ( I ) = α 0 + βI and n ( I ) = n 0 + n 2 I where α 0 and n 0 denote the linear absorption coefficient and the linear refractive index of the material, whereas β and n 2 represent the two-photon absorption (TPA) coefficient and third-order nonlinear refractive index, respectively.…”

Section: Resultsmentioning

confidence: 99%

Section: Third-order Nonlinear Optical Studiesmentioning

confidence: 99%

Synthesis and the spectral, electrochemical, and nonlinear optical properties of β-dicyanovinyl-appended ‘push–pull’ porphyrins

et al. 2022

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“…Reduced or eliminated surface reflection over a broad spectrum is vital for a variety of key applications, including solar energy absorption and conversion, artificial blackbodies, photodetectors, stray light shields, infrared imaging, stealth, and space-borne optics. , It is also the primary goal of ongoing research into various antireflection strategies, such as the shift from traditional quarter-wavelength single-layer antireflection films to multi-layer film stacks, , the shift from directly moth-eye mimics to porous or nanowire-based dielectric structures for gradient refractive index, − and the shift from single-scale metallic micro- or nanostructures to macro–micro–nano hi-tech structures. − Furthermore, numerous novel optical antireflection fabrication techniques are under development, − such as physical or chemical fabrication of masked or direct methods for wavelength-ordered one- (1D), two- (2D), and three-dimensional (3D) structures. − Mask-less direct methods, such as laser and ion beam writing techniques, on the other hand, are faster and have a wider range of applications …”

Section: Introductionmentioning

confidence: 99%

Studies on Femtosecond Laser Textured Broadband Anti-reflective Hierarchical a-SiNx:H Thin Films for Photovoltaic Applications

Malik

Acharyya

Shanu

et al. 2023

ACS Appl. Energy Mater.

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Simple ultrafast laser writing for the fabrication of hierarchical silicon nitride (a-SiNx:H) microstructures is demonstrated as an effective antireflection coating. A wide range of Si-rich to N-rich a-SiNx:H thin films, having varied optical band gap (2.32–5.94 eV) and refractive index (2.8–1.7) of wavelength-ordered (∼λ/4) thickness, are deposited using the plasma-enhanced chemical vapor deposition technique. The high-intensity femtosecond laser (800 nm, 120 fs, 1 kHz) interaction with a-SiNx:H films resulted in diverse nano-/microstructures with systematic width and depth born out of nonlinear light–matter interactions. These experimentally demonstrated the extremely disordered micro–nano structures over a large area of ∼ 1 cm2 that exhibit significant light trapping and absorption capabilities over a broad spectral region of 200–1000 nm. The extensive reduction of reflection losses from 30 to 2.8% from pre- to post-laser texturing is a favorable condition for broadband anti-reflective coatings for enhanced light harvesting from prefabricated photovoltaic devices.

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Nonlinear optical dispersion and higher-order effects in bulk and wavelength-ordered photonic materials

Cited by 8 publications

References 43 publications

Unsymmetrically β-Functionalized π-Extended Porphyrins: Synthesis, Spectral, Electrochemical Redox Properties, and Their Utilization as Efficient Two-Photon Absorbers

Unsymmetrically β-Functionalized π-Extended Porphyrins: Synthesis, Spectral, Electrochemical Redox Properties, and Their Utilization as Efficient Two-Photon Absorbers

Synthesis and the spectral, electrochemical, and nonlinear optical properties of β-dicyanovinyl-appended ‘push–pull’ porphyrins

Studies on Femtosecond Laser Textured Broadband Anti-reflective Hierarchical a-SiNx:H Thin Films for Photovoltaic Applications

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