Fig. 3From: Ferroelectric domain states of a tetragonal BiFeO3 thin film investigated by second harmonic generation microscopySecond harmonic generation (SHG) results obtained with beam sizes of 1.5 and 2.1 μm. a, b The SHG intensity mapping image obtained with beam sizes of 1.5 and 2.1 μm, respectively. c, d Azimuth-dependent polar plots of the SHG intensity obtained at different sample positions with beam sizes of 1.5 and 2.1 μm, respectively, along the arrows in each figureBack to article page