Ultrafast third order nonlinear optical properties of water soluble zinc-octacarboxy-phthalocyanine

2012 ◽  
Vol 16 (09) ◽  
pp. 1015-1023 ◽  
Author(s):  
M. Bala Murali Krishna ◽  
L. Giribabu ◽  
D. Narayana Rao
Keyword(s):  
Optical Switching ◽  
Nonlinear Optical ◽  
Water Soluble ◽  
Photon Absorption ◽  
Saturable Absorption ◽  
Reverse Saturable Absorption ◽  
Third Order ◽  
Two Photon Absorption ◽  
Time Domains ◽  
Soluble Zinc

Synthesis and measurements of third order nonlinear optical (NLO) coefficients of water soluble zinc octacarboxy phthalocyanine (ZnOCPc) are reported here using different laser pulse durations. Nonlinear absorption and refraction behaviour in the nanosecond (ns), picosecond (ps) and femtosecond (fs) time domains were studied in detail. Three-photon absorption was the prevalent mechanism with femtosecond laser excitation whereas strong reverse saturable absorption due to dominant two-photon absorption (TPA) was observed with picosecond and nanosecond excitations. We have evaluated the sign and magnitude of the third order nonlinearity in fs, ps, and ns regimes. We observed large off-resonant second order hyperpolarizability (γ) with ultrafast nonlinear optical response in the femtosecond domain using degenerate four wave mixing (DFWM) technique. We also report the optical limiting characteristics and figure of merit (FOM) of ZnOCPc for optical switching.

scholarly journals The Broadband Nonlinear Optical Response in Graphene/MoS2/Ag Thin Films at Near Infrared

2021 ◽  
Vol 8 ◽  
Author(s):  
Di Sun ◽  
Yu Fang ◽  
Xiaoyan Yan ◽  
Wen Shan ◽  
Wenjun Sun ◽  
...  
Keyword(s):  
Thin Films ◽  
Optical Properties ◽  
Magnetron Sputtering ◽  
Optical Switching ◽  
Nonlinear Optical ◽  
Nonlinear Refraction ◽  
Photon Absorption ◽  
Saturable Absorption ◽  
Reverse Saturable Absorption ◽  
Free Carrier Absorption

Graphene/MoS2/Ag thin films were successfully prepared by the magnetron sputtering technique and liquid phase exfoliation. Structure, morphology, optical properties, and nonlinear optical characteristics of the graphene/MoS2/Ag and graphene/MoS2 thin films were studied by X-ray diffractometer, spectrophotometer, field-scanning electron microscope, and femtosecond (fs) Z-scan technique. The results of the fs Z-scan experiment indicate that the graphene/MoS2/Ag thin films exhibit reverse saturable absorption properties due to the free carrier absorption and two-photon absorption. More importantly, with the increase of DC magnetron sputtering power (from 5 to 15 W), the local surface plasmon resonance effect of the Ag thin films increases, which leads to the enhancement of nonlinear optical properties of the graphene/MoS2/Ag thin films. The nonlinear absorption coefficients of the graphene/MoS2/Ag thin films are increased from 1.14 × 10–10 to 1.8 × 10–10 m/W at 800 nm and from 4.79 × 10–11 to 6.79 × 10–11 m/W at 1,030 nm, and the nonlinear refraction index of the graphene/MoS2/Ag thin films is -4.37 × 10–17∼−4.18 × 10–16 m2/W under the excitation of 800 and 1,030 nm, respectively. Moreover, when the graphene/MoS2/Ag thin films were excited at 800 and 1,030 nm, respectively, the nonlinear figure of merit values of the graphene/MoS2/Ag thin films are increased from 1.23 to 2.91 and from 1.30 to 1.47, which are enough to support the application of the graphene/MoS2/Ag thin films in the field of all-optical switching applications.

Picosecond and femtosecond optical nonlinearities of novel corroles

2012 ◽  
Vol 16 (01) ◽  
pp. 140-148 ◽  
Author(s):  
Syed Hamad ◽  
Surya P. Tewari ◽  
L. Giribabu ◽  
S. Venugopal Rao
Keyword(s):  
Nonlinear Absorption ◽  
Nonlinear Optical ◽  
Laser Pulses ◽  
Photon Absorption ◽  
Saturable Absorption ◽  
Reverse Saturable Absorption ◽  
Closed Aperture ◽  
Absorption Data ◽  
Time Domains ◽  
Fs Laser

We present our results from the experimental and modeling studies of picosecond (ps) and femtosecond (fs) nonlinearities of two novel corroles (a) tritolyl corrole (TTC) (b) triphenyl corrole (TPC) using the Z-scan technique. Both open and closed aperture Z-scan curves were recorded with ~2 ps/~40 fs laser pulses at a wavelength of 800 nm and nonlinear optical coefficients were extracted for both studies. Both the molecules possessed negative nonlinear refractive index (n2) as revealed by signature of the closed aperture data in both (ps and fs) time domains. Picosecond nonlinear absorption data of TPC obtained at a concentration of 5 × 10-4 M demonstrated complex behavior with switching from reverse saturable absorption (RSA) within saturable absorption (SA) at lower peak intensities to RSA at higher peak intensities. TTC data recorded at the similar concentration exhibited saturable absorption (SA) type of behavior at lower peak intensities to switching from RSA with in SA at higher peak intensities. At a concentration of 2.5 × 10-4 M, the ps open aperture data at higher peak intensities illustrated effective three-photon absorption (3PA) for both the molecules. We also report the picosecond spectral dependent Z-scan studies performed at 680 nm, 700 nm, and 740 nm. Nonlinear absorption and refraction of both the samples at these three wavelengths were studied in detail. Femtosecond nonlinear absorption data of TPC and TTC demonstrated the behavior of saturable absorption (SA) at a concentration of 1 × 10-3 M. Solvent contribution to the nonlinearity was also identified. We have also evaluated the sign and magnitude of third order nonlinearity. We discuss the nonlinear optical performance of these organic molecules.

scholarly journals Optical, Electrochemical, Third-Order Nonlinear Optical Investigations of 3,4,5-Trimethoxy Phenyl Substituted Non-Aqueous Phthalocyanines

2021 ◽  
Vol 9 ◽  
Author(s):  
K. S. Srivishnu ◽  
Dipanjan Banerjee ◽  
Ramya Athira Ramnagar ◽  
Jagannath Rathod ◽  
Lingamallu Giribabu ◽  
...  
Keyword(s):  
Cross Sections ◽  
Optical Switching ◽  
Nonlinear Optical ◽  
Phenyl Group ◽  
Photon Absorption ◽  
Quantum Yields ◽  
Third Order ◽  
Time Resolved ◽  
Nlo Properties ◽  
Two Photon Absorption

A new series of non-aqueous phthalocyanines having 3,4,5-trimethoxy phenyl group at peripheral positions in which the central cavity possessing Cu(II), Zn(II), and without metals has been synthesized, and its absorption, fluorescence (steady-state and excited state lifetimes), electrochemical, and third-order nonlinear optical (NLO) properties were evaluated. Absorption studies data suggest that all three phthalocyanines obey Beer–Lambert’s law, and the redox properties indicate that both oxidation and reduction reactions are macrocyclic centered. The singlet quantum yields were measured in different solvents and were found to be in the range of 0.2–0.5 in the case of free-base, whereas it was in the range of 0.1–0.5 in zinc derivative, while the time-resolved fluorescence data revealed lifetimes of typically a few ns. The third-order NLO properties were investigated using the Z-scan technique with kilohertz (for retrieving true electronic nonlinearities) and megahertz repetition rate femtosecond pulses at 800 nm. Intensity-dependent Z-scan studies revealed robust NLO coefficients for solutions and thin films (two-photon absorption cross-sections of 9,300–57,000 GM) of these molecules suggesting a strong potential for optical switching, imaging, and optical limiting applications.

Third-order nonlinear optical properties and two-photon absorption in branched oligothienylenevinylenes

2002 ◽  
Vol 209 (4-6) ◽  
pp. 461-466 ◽  
Author(s):  
I. Fuks-Janczarek ◽  
J-M. Nunzi ◽  
B. Sahraoui ◽  
I.V. Kityk ◽  
J. Berdowski ◽  
...  
Keyword(s):  
Optical Properties ◽  
Nonlinear Optical ◽  
Nonlinear Optical Properties ◽  
Photon Absorption ◽  
Third Order ◽  
Two Photon Absorption ◽  
Two Photon

Third-order nonlinear optical properties and two-photon absorption in polymers doped withp-phenyl sydnone

2008 ◽  
Vol 108 (5) ◽  
pp. 3218-3224 ◽  
Author(s):  
Seetharam Shettigar ◽  
G. Umesh ◽  
K. Chandrasekharan ◽  
Ganesh Rai ◽  
B. Kalluraya
Keyword(s):  
Optical Properties ◽  
Nonlinear Optical ◽  
Nonlinear Optical Properties ◽  
Photon Absorption ◽  
Third Order ◽  
Two Photon Absorption ◽  
Two Photon

Nonlinear optical interactions of Co: ZnO nanoparticles in continuous and pulsed mode of operations

RSC Advances ◽  
2015 ◽  
Vol 5 (98) ◽  
pp. 80756-80765 ◽  
Author(s):  
Rajeswari Ponnusamy ◽  
Dhanuskodi Sivasubramanian ◽  
P. Sreekanth ◽  
Vinitha Gandhiraj ◽  
Reji Philip ◽  
...  
Keyword(s):  
Laser Irradiation ◽  
Zno Nanoparticles ◽  
Nonlinear Optical ◽  
Photon Absorption ◽  
Thermal Lensing ◽  
Saturable Absorption ◽  
Two Photon Absorption ◽  
Two Photon ◽  
Pulsed Mode ◽  
Limiting Behaviour

Thermal lensing and two photon absorption with saturable absorption based optical limiting behaviour in Co: ZnO nanoparticles under CW and pulsed Nd: YAG laser irradiation.

Two-Photon Absorption in Polybenzidine

1994 ◽  
Vol 374 ◽  
Author(s):  
F. J. Aranda ◽  
C. F. Cheng ◽  
D. V. G. L. N. Rao ◽  
J. A. Akkara ◽  
D. L. Kaplan ◽  
...  
Keyword(s):  
Slow Component ◽  
Photon Absorption ◽  
Polymerization Reaction ◽  
Imaginary Component ◽  
Saturable Absorption ◽  
Reverse Saturable Absorption ◽  
Nonlinear Optical Susceptibility ◽  
Two Photon Absorption ◽  
Two Photon ◽  
Nanosecond Pulses

AbstractPolymers of Benzidine were synthesized by hydrogen peroxide reaction catalyzed by horseradish peroxidase enzyme. The polymerization reaction was carried out at room temperature in a monophasic organic solvent with a small amount of water at pH 7.5.The technique of degenerate four-wave mixing (DFWM) with nanosecond and picosecond pulses was employed to measure the third-order nonlinear optical susceptibility χ. The samples were studied in solution in Dimethyl sulfoxide:Methanol in volume ratio 4:1. The observed values are of order 10−9 to 10−8esu. Measurements on a thin film agree approximately with the extrapolated values fron solution measurements. Picosecond time resolved measurements indicate a pulse-width limited response followed by a small slow component. Investigation of the total energy transmission as a function of the incident intensity and fluence at 532 nm for pico- and nanosecond pulses indicates reverse saturable absorption. As we observe the nanosecond and picosecond curves to be superimposed for the intensity plot but not for fluence, we conclude that the nonlinearity is predominantly due to two-photon absorption. Numerical analysis of the data yields a value of 12.25 cm/GW for the two-photon absorption coefficient β. The imaginary component of χ obtained is 5 × 10−9esu. The material appears to be a good candidate for applications in optical power limiting and switching.

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