Abstract
Bragg reflection spectra of high-contrast silicon-based 1D photonic crystals were measured for oblique incidence of light. The angular behaviour of the stop-band width has been investigated in the vicinity of the critical angle of incidence (an analogue of the Brewster angle) at which the stop-band for TM-mode disappears. The stop-band inhibition is experimentally observed against the background of pronounced Fabry–Perot interference due to the finite thickness of a photonic crystal slab. It is shown that the width of equidistant fringes arising from the interference limits the minimal measured Bragg reflection band width. The conditions for stop-band to collapse are considered theoretically and shown to be in good agreement with the experimental data presented.
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