Ultradispersive prisms and narrow-band tunable filters combining dispersion of atomic resonances and photonic band-gap structures

It is shown that the combination of resonance-enhanced dispersion of an ato mic or molecular gas with the dispersion of a photonic band-gap (PBG) struc ture gives rise to new features in the dispersion and transmission of a hyb rid resonant gas/PBG system, including the appearance of narrow passbands i n the band gap and stop bands outside the band gap, as well as the enhancem ent of the dispersion of the structure within a narrow spectral range. The possibility of creating narrow-passband and narrow-stopband filters and ult rarefractive prisms combining the dispersion properties of resonant gases a nd PEG structures is demonstrated. Transmissive and dispersive properties o f gas-filled PEG structures can be controlled by varying the gas pressure a nd by tuning the band gap with respect to the frequency of an atomic or mol ecular resonance in a gas. Gas-filled two-dimensional PEG structures can be used for numerous high-resolution and high-precision spectroscopic applica tions, as well as for spectrally resolved Raman imaging of gas flows and pl asmas.