All-optical ultrafast logic gates based on saturable to reverse saturable absorption transition in CuPc-doped PMMA thin films

2011 ◽  
Vol 284 (19) ◽  
pp. 4435-4440 ◽  
Author(s):  
Sukhdev Roy ◽  
Chandresh Yadav
Keyword(s):  
Thin Films ◽  
Logic Gates ◽  
Saturable Absorption ◽  
Reverse Saturable Absorption ◽  
All Optical

Dynamics of reverse saturable absorption and all-optical switching in C_60

1994 ◽  
Vol 11 (8) ◽  
pp. 1356 ◽  
Author(s):  
Chunfei Li ◽  
Lei Zhang ◽  
Ruibo Wang ◽  
Yinling Song ◽  
Yuxiao Wang
Keyword(s):  
Optical Switching ◽  
Saturable Absorption ◽  
Reverse Saturable Absorption ◽  
All Optical ◽  
All 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.

THIRD-ORDER NONLINEAR OPTICAL INTERACTIONS IN TETRABENZPORPHYRINS

1994 ◽  
Vol 03 (04) ◽  
pp. 511-529 ◽  
Author(s):  
D.V.G.L.N. RAO ◽  
F.J. ARANDA ◽  
D.E. REMY ◽  
J.F. ROACH
Keyword(s):  
Nonlinear Optical ◽  
Excited State Absorption ◽  
Saturable Absorption ◽  
Reverse Saturable Absorption ◽  
Third Order ◽  
Nonlinear Optical Susceptibility ◽  
Langmuir Blodgett ◽  
Optical Susceptibility ◽  
All Optical ◽  
Absorption Measurements

Third-order nonlinear optical susceptibility χ(3) was measured for a variety of tetrabenzporphyrin compounds in solution in tetrahydrofuran at 532 nm using the technique of degenerate four-wave mixing. High values in the range 10−9 to 10−8 esu are observed. The dominant contribution comes from the imaginary part as a result of excited state absorption. Measurements were also made on thin films, deposited by the Langmuir-Blodgett technique, for one of the compounds. Mirrorless all-optical bistability induced by reverse saturable absorption was observed. These materials are good candidates for some applications in photonics technology.

The saturable absorption and reverse saturable absorption properties of Cu doped zinc oxide thin films

2017 ◽  
Vol 671 ◽  
pp. 113-117 ◽  
Author(s):  
Cheng-Bao Yao ◽  
Xin Wen ◽  
Qiang-Hua Li ◽  
Xiao-Yan Yan ◽  
Jin Li ◽  
...  
Keyword(s):  
Thin Films ◽  
Zinc Oxide ◽  
Saturable Absorption ◽  
Reverse Saturable Absorption ◽  
Oxide Thin Films ◽  
Absorption Properties

Enhanced third-order nonlinear optical properties determined in thin films using the Z-scan technique: bis(μ-4,4′-oxydibenzoato)bis[(4′-phenyl-2,2′:6′,2′′-terpyridine)cobalt(II)]

2016 ◽  
Vol 72 (5) ◽  
pp. 451-455 ◽  
Author(s):  
Runqiang Liu ◽  
Ning Zhao ◽  
Ping Liu ◽  
Caixia An ◽  
Zhaoxun Lian
Keyword(s):  
Thin Films ◽  
Nonlinear Optical ◽  
Response Times ◽  
Saturable Absorption ◽  
Reverse Saturable Absorption ◽  
Hydrothermal Conditions ◽  
Third Order ◽  
Nlo Properties ◽  
Heterocyclic Ligand ◽  
The Third

π-Conjugated organic materials exhibit high and tunable nonlinear optical (NLO) properties, and fast response times. 4′-Phenyl-2,2′:6′,2′′-terpyridine (PTP) is an important N-heterocyclic ligand involving π-conjugated systems, however, studies concerning the third-order NLO properties of terpyridine transition metal complexes are limited. The title binuclear terpyridine CoIIcomplex, bis(μ-4,4′-oxydibenzoato)-κ3O,O′:O′′;κ3O′′:O,O′-bis[(4′-phenyl-2,2′:6′,2′′-terpyridine-κ3N,N′,N′′)cobalt(II)], [Co2(C14H8O5)2(C21H15N3)2], (1), has been synthesized under hydrothermal conditions. In the crystal structure, each CoIIcation is surrounded by three N atoms of a PTP ligand and three O atoms, two from a bidentate and one from a symmetry-related monodentate 4,4′-oxydibenzoate (ODA2−) ligand, completing a distorted octahedral coordination geometry. Neighbouring [Co(PTP)]2+units are bridged by ODA2−ligands to form a ring-like structure. The third-order nonlinear optical (NLO) properties of (1) and PTP were determined in thin films using the Z-scan technique. The title compound shows a strong third-order NLO saturable absorption (SA), while PTP exhibits a third-order NLO reverse saturable absorption (RSA). The absorptive coefficient β of (1) is −37.3 × 10−7 m W−1, which is larger than that (8.96 × 10−7 m W−1) of PTP. The third-order NLO susceptibility χ(3)values are calculated as 6.01 × 10−8 e.s.u. for (1) and 1.44 × 10−8 e.s.u. for PTP.

scholarly journals Exfoliated Bi2Te3 nanoparticle suspensions and films: morphological and nonlinear optical characterization

Nanophotonics ◽  
2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Rashid A. Ganeev ◽  
V. S. Popov ◽  
A. I. Zvyagin ◽  
N. A. Lavrentyev ◽  
A. E. Mirofyanchenko ◽  
...  
Keyword(s):  
Thin Films ◽  
Nonlinear Optical ◽  
Nonlinear Refraction ◽  
Colloidal Suspensions ◽  
Saturable Absorption ◽  
Reverse Saturable Absorption ◽  
Optical Parameters ◽  
Probe Radiation ◽  
Saturation Intensity ◽  
532 Nm

Abstract Bismuth telluride nanoparticles (NPs) attract attention due to the growth of sensitivity of the Bi2Te3 NPs-containing registrars in the near- and mid-infrared ranges. We describe the synthesis and characterization of these structures and analyze the low-order nonlinear optical properties of the colloidal suspensions and thin films containing Bi2Te3 NPs using 1064 and 532 nm, 10 ns pulses. Colloidal Bi2Te3 NPs demonstrate saturable absorption and positive nonlinear refraction (saturation intensity 7 × 108 W cm−2, nonlinear absorption coefficient β SA = −7 × 10−8 cm W−1, nonlinear refractive index γ = 9 × 10−12 cm2 W−1), while at stronger excitation by 532 nm, 10 ns pulses the reverse saturable absorption dominates over other nonlinear optical processes. We achieved significant growth of the nonlinear optical parameters of the thin films containing these NPs (film thickness l = 60 nm, β SA = −1.2 × 10−4 cm W−1, γ = 5 × 10−7 cm2 W−1 in the case of 532 nm probe radiation and β = −5 × 10−5 cm W−1, γ = 6 × 10−8 cm2 W−1 in the case of 1064 nm probe radiation) compared with colloidal Bi2Te3 NPs and discuss the observed peculiarities of the nonlinear response of Bi2Te3 nanostructures.

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