Investigation of ultrafast broadband optical nonlinearity and intensity-dependent nonlinear absorption in novel hydrazone derivatives

2022 ◽  
Vol 149 ◽  
pp. 107798
Author(s):  
Ruipeng Niu ◽  
Shuang Chen ◽  
Wenfa Zhou ◽  
Xingzhi Wu ◽  
Junyi Yang ◽  
...  
Keyword(s):  
Nonlinear Absorption ◽  
Optical Nonlinearity

scholarly journals Нелинейное поглощение растворов метиленового голубого в присутствии плазмонных наночастиц с различным поверхностным зарядом

2020 ◽  
Vol 128 (9) ◽  
pp. 1380
Author(s):  
А.П. Русинов ◽  
М.Г. Кучеренко
Keyword(s):  
Methylene Blue ◽  
Silver Nanoparticles ◽  
Mathematical Models ◽  
Surface Charge ◽  
Light Absorption ◽  
Nonlinear Absorption ◽  
Nonlinear Optical ◽  
Optical Nonlinearity ◽  
Dye Molecules ◽  
Gold And Silver Nanoparticles

By continuous-pump Z-scanning, the nonlinear light absorption of aqueous and alcohol solutions of methylene blue was studied. It was shown that the mechanisms of optical nonlinearity of these solutions vary depending on the dye concentration and type of solvent. The dependence of the amplitude of nonlinear absorption of dye molecules on the concentration and sign of the surface charge of gold and silver nanoparticles in solution is revealed. Mathematical models of optical nonlinearity for concentrated and diluted solutions of dye molecules are considered; in the latter case, the influence of plasmon nanoparticles on the nonlinear optical characteristics of methylene blue solutions is taken into account

Cubic Nonlinearity of Molybdenum Disulfide Nanoflakes

2020 ◽  
Vol 20 (7) ◽  
pp. 4373-4375
Author(s):  
Tikaram Neupane ◽  
Quinton Rice ◽  
Sungsoo Jung ◽  
Bagher Tabibi ◽  
Felix Jaetae Seo
Keyword(s):  
Molybdenum Disulfide ◽  
Nonlinear Absorption ◽  
Repetition Rate ◽  
Nonlinear Refraction ◽  
Optical Nonlinearity ◽  
Excitation Intensity ◽  
Resonant Excitation ◽  
Excitation Source ◽  
Cubic Nonlinearity ◽  
532 Nm

The cubic optical nonlinearity of molybdenum disulfide (MoS2) nanoflakes was characterized by Z-scan and I-scan with resonant excitation. The excitation source was a ~6 ns laser at 532 nm with a 10 Hz repetition rate. The open and closed Z-scan analyzed the nonlinear absorption and nonlinear refraction properties of MoS2 nanoflakes. The I-scan technique characterized the nonlinear transmittance properties of MoS2 nanoflakes at the peak and valley of closed Z-scan trace as a function of excitation intensity.

Ultrafast and broadband optical nonlinearity in aluminum doped zinc oxide colloidal nanocrystals

Nanoscale ◽  
2019 ◽  
Vol 11 (29) ◽  
pp. 13988-13995 ◽  
Author(s):  
Xiangling Tian ◽  
Hongyu Luo ◽  
Rongfei Wei ◽  
Meng Liu ◽  
Zhaoliang Yang ◽  
...  
Keyword(s):  
Zinc Oxide ◽  
Saturable Absorber ◽  
Nonlinear Absorption ◽  
Fiber Lasers ◽  
Optical Nonlinearity ◽  
Colloidal Nanocrystals ◽  
Aluminum Doped Zinc Oxide ◽  
Doped Zno

Al-doped ZnO possesses ultrafast and broadband nonlinear absorption covering NIR and mid-IR. Mode-locked fiber lasers at 1064 nm and 1550 nm and Q-switched fiber lasers at 2000 nm and 3000 nm were obtained by employing the saturable absorber.

Nonlinear Fiber Core Liquid and Nematic Liquid Crystal Film for Wide Temporal Bandwidth Optical Limiting Application

1999 ◽  
Vol 597 ◽  
Author(s):  
I. C. Khoo
Keyword(s):  
Liquid Crystal ◽  
Liquid Crystals ◽  
Optical Fiber ◽  
Nonlinear Absorption ◽  
Nonlinear Optical ◽  
Optical Limiting ◽  
Optical Nonlinearity ◽  
Fiber Core ◽  
Crystal Film ◽  
Nonlinear Fiber

AbstractNonlinear absorption processes in an extremely nonlinear optical fiber core liquid, and recently observed supra-optical-nonlinearity in dopant modified nematic liquid crystals, are discussed in the context of optical limiting and anti-laser dazzling application.

Nonlinear Absorption and Limiting Behaviour of Monoclinic and Orthorhombic Copper Niobate

2017 ◽  
Vol 865 ◽  
pp. 20-24
Author(s):  
N. Priyadarshani ◽  
T.C. Sabari Girisun
Keyword(s):  
Nonlinear Absorption ◽  
Orthorhombic Phase ◽  
Optical Nonlinearity ◽  
Photon Absorption ◽  
Saturable Absorption ◽  
Reverse Saturable Absorption ◽  
Pore Networks ◽  
Two Photon Absorption ◽  
Two Photon ◽  
Limiting Behaviour

Monoclinic and orthorhombic phase of copper niobate was prepared by simple solid state reaction (700°C, 900°C for 12 hours). Formation of two polymorphic phases of CuNb2O6 was ascertained by XRD and FTIR analysis. FESEM showed the presence of pore networks in both phases. Third-order optical nonlinearity and their limiting behaviour were studied by Z-scan technique using Ti: Sapphire laser (800 nm, 150 fs, 80 MHz). Both phases of copper niobate exhibit reverse saturable absorption. The observed optical limiting action was ascribed due to two-photon absorption process. Monoclinic copper niobate shows almost 100 times stronger nonlinear absorption behaviour than orthorhombic copper niobate due to peculiar distortion of NbO6 octahedra. Monoclinic copper niobate with high two photon absorption coefficient (85x10-10 m/W) and low limiting threshold (0.21 μJ/cm2) can be a better alternate for benchmark optical limiters like carbon nanotubes.

scholarly journals Femtosecond Optical Nonlinearity of Nanodiamond Suspensions

2021 ◽  
Vol 11 (12) ◽  
pp. 5455
Author(s):  
Gennady M. Mikheev ◽  
Viatcheslav V. Vanyukov ◽  
Tatyana N. Mogileva ◽  
Konstantin G. Mikheev ◽  
Alexander N. Aleksandrovich ◽  
...  
Keyword(s):  
Optical Properties ◽  
Nonlinear Absorption ◽  
Optical Limiting ◽  
Optical Nonlinearity ◽  
Photon Absorption ◽  
Detonation Nanodiamonds ◽  
Saturable Absorption ◽  
Aqueous Suspensions ◽  
Saturation Intensity ◽  
High Pressure High Temperature

High pressure-high temperature (HP-HT) nanodiamonds and detonation nanodiamonds have unique optical properties and are promising materials for various applications in photonics. In this work, for the first time, comparative studies of the nonlinear optical properties of aqueous suspensions of HP-HT and detonation nanodiamonds under femtosecond laser excitation are performed. Using the z-scan technique, it was found that for the same laser pulse parameters HP-HT nanodiamonds exhibited optical limiting due to two-photon absorption while detonation nanodiamonds exhibited saturable absorption accompanied by short-term optical bleaching, revealing the different electronic-gap structures of the two types of nanodiamonds. The saturable absorption properties of detonation nanodiamonds are characterized by determining the saturable and non-saturable absorption coefficients, the saturation intensity, and the ratio of saturable to non-saturable losses. The nonlinear absorption in HP-HT nanodiamonds is described with the nonlinear absorption coefficient that decreases with decreasing concentration of nanoparticles linearly. The results obtained show the possibility of using aqueous suspensions of nanodiamonds for saturable absorption and optical limiting applications.

Plasmonic Optical Nonlinearities of Copper Sulfide Nanoparticles

MRS Advances ◽  
2018 ◽  
Vol 3 (14) ◽  
pp. 741-746 ◽  
Author(s):  
Yasushi Hamanaka ◽  
Tatsunori Hirose ◽  
Kaoru Yamada ◽  
Kazuki Miyagawa ◽  
Toshihiro Kuzuya
Keyword(s):  
Electric Field ◽  
Nonlinear Absorption ◽  
Near Infrared ◽  
Au Nanoparticles ◽  
Visible Region ◽  
Optical Nonlinearity ◽  
Noble Metal Nanoparticles ◽  
Localized Surface Plasmon ◽  
Optical Nonlinearities ◽  
Theoretical Simulation

ABSTRACTSpherical Cu2-xS nanoparticles with an average diameter of 4.6 nm were synthesized by a colloidal method, and their optical nonlinearities around localized surface plasmon resonance in the near-infrared region were investigated. Resonant enhancement of nonlinear absorption, which is similar to that in the case of the noble metal nanoparticles in the visible region, was observed. The nonlinear absorption coefficients of the Cu2-xS nanoparticles were smaller as compared with those of Au nanoparticles with the same dimensions and concentrations. Theoretical simulation of electric field distributions around individual nanoparticles suggested that the free carrier concentration in Cu2-xS nanoparticles was one order of magnitude smaller than that in Au nanoparticles, which led to a weaker local electric field and weaker optical nonlinearity.

Studies of third-order optical nonlinearity and nonlinear absorption in tetra tolyl porphyrins using degenerate four wave mixing and Z-scan

2000 ◽  
Vol 182 (1-3) ◽  
pp. 255-264 ◽  
Author(s):  
S.Venugopal Rao ◽  
N.K.M.Naga Srinivas ◽  
D.Narayana Rao ◽  
L. Giribabu ◽  
Bhaskar G. Maiya ◽  
...  
Keyword(s):  
Nonlinear Absorption ◽  
Optical Nonlinearity ◽  
Four Wave Mixing ◽  
Wave Mixing ◽  
Third Order ◽  
Degenerate Four Wave Mixing

Theoretical Framework of 1,3-Thiazolium-5-Thiolates Mesoionic Compounds: Exploring the Nature of Photophysical Properties and Molecular Nonlinearity

2020 ◽  
Author(s):  
Zeyu Liu ◽  
Shugui Hua ◽  
Tian Lu ◽  
Ziqi Tian
Keyword(s):  
Optical Properties ◽  
Rational Design ◽  
Rayleigh Scattering ◽  
Function Analysis ◽  
Theoretical Calculations ◽  
Photophysical Properties ◽  
Optical Nonlinearity ◽  
Nonlinear Properties ◽  
Photoelectric Performance ◽  
Wave Function Analysis

Inspired by a previous experimental study on the first-order hyperpolarizabilities of 1,3-thiazolium-5-thiolates mesoionic compounds using Hyper-Rayleigh scattering technique, we theoretically investigated the UV-Vis absorption spectra and every order polarizabilities of these mesoionic molecules. Based on the fact that the photophysical and nonlinear properties observed in the experiment can be perfectly replicated, our theoretical calculations explored the essential characteristics of the optical properties of the mesoionic compounds with different electron-donating groups at the level of electronic structures through various wave function analysis methods. The influence of the electron-donating ability of the donor on the optical properties of the molecules and the contribution of the mesoionic ring moiety to their optical nonlinearity are clarified, which have not been reported by any research so far. This work will help people understand the nature of optical properties of mesoionic-based molecules and provide guidance for the rational design of molecules with excellent photoelectric performance in the future.

Synthesis and Third-order Optical Nonlinearity of Mesoporous Au/ZrO2 Thin Films

2012 ◽  
Vol 27 (3) ◽  
pp. 327-331
Author(s):  
Qiang LU ◽  
Fang-Ming CUI ◽  
Chen-Yang WEI ◽  
Zi-Le HUA ◽  
Chang-Qing DONG
Keyword(s):  
Thin Films ◽  
Optical Nonlinearity ◽  
Third Order
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