scholarly journals Bimetallic Fe-Ag arrays with extraordinary nonlinear refraction and nonlinear Faraday rotation at telecommunication wavelength (1550 nm)

2020 ◽  
Author(s):  
Krishna Prasad Koirala ◽  
Hernando Garcia ◽  
Venkatanarayana Prasad Sandireddy ◽  
Ramki Kalyanaraman ◽  
Gerd Duscher
Keyword(s):  
Faraday Rotation ◽  
Figure Of Merit ◽  
Nonlinear Response ◽  
Nonlinear Refraction ◽  
Third Order ◽  
Nanoscale System ◽  
Optical Susceptibility ◽  
Telecommunication Wavelength ◽  
Nonlinear Faraday Rotation ◽  
Induced Dipoles

Abstract There is a pressing need to discover magneto-optical materials and devices with better performance and lower cost that operate at telecommunication wavelengths. Here we report the discovery of giant negative nonlinear refraction and nonlinear Faraday rotation at 1550 nm using an array of bimetallic Fe-Ag nanopyramids. This system exhibited a very large third order nonlinear refractive index (n2 = -2.32 cm2/GW) and nonlinear figure of merit (F = 2.3). The same system also exhibited an extraordinarily large magneto-optical susceptibility (χi4 = 6.5 × 10-12 esu) and photoinduced nonlinear Faraday rotation up to 2.5 radian/μm at a magnetic field of 0.5 T. The nonlinear response was dependent on the degree of overlap of the Fe nanopyramid on the Ag nanopyramid which influences the strength of plasmon induced dipoles on the Ag nanopyramid. This nanoscale system opens up a rich new set of possibilities in utilizing magneto-plasmonic materials to miniaturize future multifunctional devices at telecommunication wavelengths.

scholarly journals Size Dependence of the Resonant Third-Order Nonlinear Refraction of Colloidal PbS Quantum Dots

Photonics ◽  
2020 ◽  
Vol 7 (2) ◽  
pp. 39
Author(s):  
Ivan D. Skurlov ◽  
Evgeniia A. Ponomareva ◽  
Azat O. Ismagilov ◽  
Sergey E. Putilin ◽  
Ilia A. Vovk ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Lead Sulfide ◽  
Figure Of Merit ◽  
Nonlinear Response ◽  
Size Dependence ◽  
Nonlinear Refraction ◽  
Colloidal Solutions ◽  
Third Order ◽  
Lead Sulfide Quantum Dots ◽  
Pbs Quantum Dots

Due to their high resonant third-order nonlinear response, lead sulfide quantum dots (QDs) are potential materials for applications in the field of nonlinear optics. In this paper, we implement the Z-scan method to study the resonant nonlinear response of lead sulfide QDs in colloidal solutions. We managed to measure the purely intrinsic resonant nonlinear response, free of thermal contribution. We report that the lead sulfide QD third-order nonlinear response per QD shows an unconventional increase. A figure of merit for QD nonlinearity grows as a power function with a factor of 2.9.

scholarly journals Dielectric, etching and Z-scan studies of glycine doped potassium thiourea chloride crystal

2016 ◽  
Vol 34 (4) ◽  
pp. 800-805 ◽  
Author(s):  
S.M. Azhar ◽  
Mohd Anis ◽  
S.S. Hussaini ◽  
S. Kalainathan ◽  
M.D. Shirsat ◽  
...  
Keyword(s):  
Nonlinear Optical ◽  
Nonlinear Refraction ◽  
Substantial Improvement ◽  
Third Order ◽  
Nonlinear Optical Susceptibility ◽  
Optical Susceptibility ◽  
Evaporation Technique ◽  
Optical Applications ◽  
Nonlinear Optical Applications

AbstractGlycine doped potassium thiourea chloride (PTC) crystal has been grown by slow solution evaporation technique. The dielectric studies have been employed to examine substantial improvement in dielectric constant and dielectric loss of glycine doped PTC crystal. The etching studies have been performed to investigate the surface quality of this crystal. The z-scan studies have been carried out at 632.8 nm to explore the third order nonlinear optical nature. The negative nonlinear refraction of glycine doped PTC crystal was found to be of 7.27 × 10−12 cm2/W. The origin of high magnitude of third order nonlinear optical susceptibility and reverse saturable nonlinear absorption have been investigated. The obtained results were explored to discuss the nonlinear optical applications of PTC crystal.

Preparation and enhanced off-resonance optical nonlinearities of CdS-capped gold nanoparticles embedded in BaTiO3 thin films

2002 ◽  
Vol 17 (11) ◽  
pp. 2802-2808 ◽  
Author(s):  
Yong Yang ◽  
Jianlin Shi ◽  
Hangrong Chen ◽  
Shugang Dai ◽  
Weiming Huang ◽  
...  
Keyword(s):  
Gold Nanoparticles ◽  
Nonlinear Response ◽  
Cds Nanoparticles ◽  
Core Shell ◽  
Third Order ◽  
Shell Nanoparticles ◽  
Nonlinear Optical Susceptibility ◽  
Self Assembling ◽  
Optical Susceptibility ◽  
Core Shell Nanoparticles

A simple approach has been developed for the synthesis of Au@CdS core-shell nanoparticles by a direct self-assembling process. Stable Au@CdS composite colloids were prepared by thiourea, as a double-functional reagent that acted as the linkage agent between Cd2+ ions and gold nanoparticles. The CdS-capped gold composite nanoparticles were successfully integrated into BaTiO3 films. A significant enhancement of third-order nonlinear optical susceptibility in the Au@CdS nanoparticles with core-shell structure is reported. To compare the effect of enhanced nonlinear response, single gold or CdS nanoparticles embedded in BaTiO3 films were also prepared.

Mechanisms of the Nonlinear Optical Response in Tetraras(Cumylphenoxy)Phthalocyanines

1992 ◽  
Vol 247 ◽  
Author(s):  
Steven R. Flom ◽  
James S. Shirk ◽  
J. R. Lindle ◽  
F. J. Bartoli ◽  
Zakya H. Kafafi ◽  
...  
Keyword(s):  
Thin Film ◽  
Figure Of Merit ◽  
Nonlinear Optical ◽  
Nonlinear Response ◽  
Physical State ◽  
Third Order ◽  
Metal Free ◽  
The Third ◽  
Nlo Response ◽  
Near Resonance

ABSTRACTThe third order nonlinear optical (NLO) response of metal free tetrakis(cumylphenoxy)-phthalocyanine, (H2Pc(CP)4) was investigated at 597 nm, near resonance with the strong Q band. The second hyperpolarizability, γ, and the figure of merit, χ(3)/α, measured with a 1.2 ps pulse. was approximately independent of concentration between a 4.6×10−4 M solution and a neat thin film. The decay of the nonlinear response, however, depended substantially on the concentration and physical state of the material.

scholarly journals Tunable Nonlinear Optical Property of MnS Nanoparticles with Different Size and Crystal Form

Nanomaterials ◽  
2019 ◽  
Vol 10 (1) ◽  
pp. 34
Author(s):  
Zhihao Zhang ◽  
Pengchao Li ◽  
Yuzong Gu
Keyword(s):  
Optical Property ◽  
Nonlinear Optical ◽  
Nonlinear Optical Property ◽  
Nonlinear Refraction ◽  
Synthesis Method ◽  
Crystal Form ◽  
Optical Nonlinearity ◽  
Photon Absorption ◽  
Third Order ◽  
Crystal Forms

It is significant to study the reason that semiconductor material has adjustable third-order optical nonlinearity through crystal form and dimensions are changed. αMnS nanoparticles with different crystal forms and sizes were successfully prepared by one-step hydrothermal synthesis method and their size-limited third-order nonlinear optical property was tested by Z-scan technique with 30 ps laser pulses at 532 nm wavelength. Nanoparticles of different crystal forms exhibited different NLO (nonlinear optical) responses. γMnS had stronger NLO response than αMnS because of higher fluorescence quantum yield. Two-photon absorption and the nonlinear refraction are enhanced as size of nanoparticlesreduced. The nanoparticles had maximum NLO susceptibility which was 3.09 × 10−12 esu. Susceptibility of αMnS increased about nine times than that of largest nanoparticles. However, it was reduced when size was further decreased. This trend was explained by the effects of light induced dipole moments. And defects in αMnS nanoparticles also had effect on this nonlinear process. MnS nanoparticles had potential application value in optical limiting and optical modulation.

Nonlinear Faraday rotation of ion-cyclotron whistler waves in the ionosphere

2012 ◽  
Vol 86 (6) ◽  
pp. 489-492
Author(s):  
S. N. Paul ◽  
S. K. Bhattacharya ◽  
B. Paul ◽  
B. Ghosh
Keyword(s):  
Faraday Rotation ◽  
Whistler Waves ◽  
Ion Cyclotron ◽  
Nonlinear Faraday Rotation
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