THE THIRD ORDER NONLINEAR SUSCEPTIBILITY OF INTERACTING ONE-DIMENSIONAL FRENKEL EXCITONS

2001 ◽  
Vol 15 (28n30) ◽  
pp. 3809-3812 ◽  
Author(s):  
H. Ishihara ◽  
T. Amakata
Keyword(s):  
Exciton State ◽  
Nonlinear Susceptibility ◽  
State Transitions ◽  
Third Order ◽  
One Dimensional ◽  
Long Wavelength ◽  
The Third ◽  
Wavelength Approximation ◽  
Frenkel Excitons ◽  
Third Order Nonlinear Susceptibility

An analytical expression of the third order nonlinear susceptibility χ(3) has been derived rigorously for a system of interacting Frenkel excitons in a one-dimensional chain of size N with the periodic boundary conditions. It has been clarified that the magnitude of interacting potential between excitons strongly influences the size dependence of χ(3) in the long wavelength approximation, which is well explained in terms of the cancellation effect between the contributions from [ground state] - [one-exciton] transitions and those from [one-exciton] - [two-exciton state] transitions.

Large third-order optical nonlinearity in PdO thin films

2017 ◽  
Vol 26 (03) ◽  
pp. 1750037 ◽  
Author(s):  
M. S. Brodyn ◽  
V. I. Volkov ◽  
V. I. Rudenko ◽  
V. R. Liakhovetskyi ◽  
A. O. Borshch
Keyword(s):  
Thin Films ◽  
Optical Nonlinearity ◽  
Nonlinear Susceptibility ◽  
Wave Mixing ◽  
Third Order ◽  
Pulsed Laser Radiation ◽  
Long Wavelength ◽  
The Third ◽  
Wavelength Absorption ◽  
Third Order Nonlinear Susceptibility

We report on a study of the absorption spectra and third-order nonlinear optical properties of crystalline PdO thin films, grown by oxidation of thin palladium films deposited on a substrate. The spectra reveal an absorption peak at [Formula: see text][Formula: see text]nm, which grows and narrows significantly as the temperature is lowered to [Formula: see text][Formula: see text]K. This behavior suggests an exciton nature of the peak. According to the position of the long wavelength absorption edge in the spectra, the bandgap of the material is [Formula: see text][Formula: see text]eV. Utilizing the techniques of degenerate four-wave mixing and Z-scan, using a pulsed laser radiation with a wavelength [Formula: see text][Formula: see text]nm and a pulse duration of [Formula: see text][Formula: see text]ns, we determined the real part of the third-order nonlinear susceptibility of Re[Formula: see text][Formula: see text]esu. Possible nature of this high refractive nonlinearity is discussed.

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