We analyse diffraction of Gaussian beams by silicon micro-cylinders with sub-wavelength radius by means of the finite-difference time-domain method. It is numerically shown that a Gaussian beam can be focused near the surface of the element into a light spot…

Generally, organic and organometallic materials containing π-conjugated chains are considered as promising candidates for nonlinear optical applications. In this work, we report on the third order nonlinear optical response of π-conjugated azo-conjugated azo-iminopyridine photoactive ligands containing electron donating or electron…