Abstract
The interference of light has been analyzed for a film structure by considering that a spatial separation exists for the two neighboring light beams to be interfered in the space. There is a significant difference between the situations of the interference with or without consideration of the spatial effect, especially around the region where the phase delay and 2π by taking the example of the one-layered structure. It is reasonable to extract the optical parameters by neglecting the spatial effect only for the thinner film with a thickness much smaller than a wavelength, which satisfies the condition that ; otherwise, the film equation used for the periodic or nonperiodic structures will be modified by including the spatial effect in the data analysis and applications.
© 2007 Optical Society of America
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