Ocean Optics NanoCalc - Manual (Page 6)

Ocean Optics Germany GmbH Thin Film Metrology
5
1.3 Physical principle
The measurement principle of NanoCalc is the well-known fact of interference of light in thin layers. Light is
reflected (and transmitted), resulting in phase shifts and superposition of amplitudes and finally adding up to
different intensities for different wavelengths (=different colors). You see these colors in every-day-life, if you
observe the colors of thin oil films on water or if you carefully observe the colored anti-reflective coating on
lenses of cameras or binoculars.
After some calculations NanoCalc will show a result (here: 499.4 nm) as the best fit to the experimental data
(red curve=measured signal, black curve = theoretical curve):
information: nearly vertical
incidence
layer
substrate
transmitted (and
absorbed)
intensity