Amplitude-phase spectroscopy of resonant reflection of light by crystals with a Fabry-Perot interferometer at the surface

Conditions for the formation of the minima of amplitude spectra of reflection of electromagnetic waves by transparent Fabry-Perot interferometers fixed on crystal surfaces with resonant dispersion of the dielectric constant epsilon(omega) are investigated. It is shown that, irrespective of the nature of the dispersion epsilon(omega), the minimum of the reflection contour is formed at a frequency omega(m) of phase compensation, for which the general phase of the reflected wave is a multiple of pi. Analytic expressions connecting the frequency corresponding to the minimum of the reflection contour with parameters of the surface resonator and resonant excitation of bulk excitons, phonons and plasmons in the substrate are obtained. (C) 1999 American Institute of Physics. [S1063- 777X(99)01510-8].