We present an analytical proof of the equivalence of scanning near-field optical images of small objects obtained by two alternative operating modes: (1) scanning at a constant distance from the mean plane of the surface and recording the detected intensity (constant-height images) and (2) keeping the detected intensity constant and recording the vertical motion of the tip (constant-intensity images). Numerical simulations with homogeneous and inhomogeneous samples illustrate this result.
© 1996 Optical Society of America
Original Manuscript: March 18, 1996
Published: August 15, 1996
Rémi Carminati and Jean-Jacques Greffet, "Equivalence of constant-height and constant-intensity images in scanning near-field optical microscopy," Opt. Lett. 21, 1208-1210 (1996)