Patent ID: 9043946
Filing Date: 2015-05-26
Classification: G01N,G01Q,H04B

Abstract:
1. A method for measuring the near field signal of a sample in a scattering type near field microscope comprising a probe and a sample, wherein said method comprises the steps of: a) measuring the scattering signal S of the probe as a function of a distance-determining parameter P, whereby the functional dependence H(P) of the probe-sample distance H on P is known, by measuring the scattering signal S(P) for at least two values of the distance-determining parameter P corresponding to two probe-sample distances H in the range H b) determining the fit coefficients of a background fit function B(P), wherein the background fit function is equation (I): wherein B(P) is the scattering signal S(P) as measured in step a), c0, c1 and c2 are fit coefficients, k is a fixed parameter or a fit coefficient, or wherein the background fit function B(P) is an at least first order approximation of equation (I) in terms of P, c) measuring the scattering signal S d) determining the near field signal N for at least one value of the distance-determining parameter P