The stop-band width and angular dispersion have been traced by angle-resolved reflectance spectroscopy for two opposite configurations of opal-based photonic crystals where either the silica balls possess a higher refractive index than the voids or vice versa. It has been demonstrated that filling the empty voids of opal with a material of higher refractive index than silica results in widening of the stop-band and squeezing of its dispersion, thus improving the stop-band of the opal grating towards the omnidirectional photonic band-gap situation.
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Romanov et al. (1999) studied this question.
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