Nanooptics and photonics

Two-photon absorption in perylene derivatives
Derkowska-Zielinska B.1, Krupka A.2
1 Institute of Physics, Faculty of Physics, Astronomy and Informatics, Nicolaus Copernicus University, Grudziadzka 5, 87-100 Torun, Poland
2 Taras Shevchenko National University of Kyiv, 60 Volodymyrska, 01033 Kyiv, Ukraine 

E-mail: beata@fizyka.umk.pl

Perylene derivatives are organic materials with semiconducting properties. The remarkable optical and electrical properties of these materials open a wide range of applications in modern optoelectronic devices such as photovoltaic cells, organic light emitting diodes (OLEDs), organic field effect transistors (OFET) and gas sensors. 
Nonlinear optical properties, such as two-photon absorption and two-photon absorption cross-section, of perylene derivatives dissolved in various solvents (e.g. tetrahydrofuran (THF), ethanol, chloroform and dimethyl sulfoxide (DMSO)) were investigated using nonlinear transmission (NLT) method at 635 nm in ps regime.
It was found that the nonlinear optical properties of perylene derivatives strongly depend on the type of used solvents. And in consequence they can be effectively changed. 
It should be noted that the control and tailor of the nonlinear optical properties of organic materials induced by various solvents is important and determine the suitability of the material for optoelectronics, photonics and nonlinear optics [1]. 

1.	Derkowska-Zielinska B. Enhancement of third-order nonlinear optical susceptibility of Alq3 in polar aprotic solvents // Optics Letters-2017.-42.-P. 567-570.