Fig. 4
From: Confocal nonlinear optical imaging on hexagonal boron nitride nanosheets
a The xy-directional image of ND-CARS (ω1, 910 nm; ω2, 1040 nm; ω3, 455 nm) of hBN flakes. The xy-directional mean filtered images of b ND-CARS and c acFE-CARS (ω1, 910 nm; ω2, 1040 nm; ω3, 455 nm) of hBN flakes, whose region is indicated with a green box in a. d The line profiles of ND-CARS and cFE-CARS of hBN are shown with cyan dotted lines in b and c. The line profiles are fitted with a Gaussian cumulative distribution function. The distance between 10 and 90% of fitted function is indicated in f. The z-directional mean filtered image of e ND-CARS and f acFE-CARS of hBN of which region is indicated with cyan dashed line in a. g The z-directional line profiles of ND-CARS and acFE-CARS of hBN flakes whose region is indicated with cyan dashed lines in e and f. The green arrows indicate the polarization direction. The white scale bars correspond to a 10 μm, b 2 μm, and e 5 μm