A. Kamli et M. Babiker, Dielectric cavity QED between photonic crystals: An effective uniaxial medium approach - art. no. 043804, PHYS REV A, 6204(4), 2000, pp. 3804
The spontaneous-emission rate is evaluated for dipole emitters situated in
the thin slab region between two semi-infinite one-dimensionally periodic p
hotonic crystals, a situation reminiscent of planar cavity laser structures
. It is pointed out that the long-wavelength electromagnetic fields support
ed by such complex structures can be directly quantized provided that the p
air of semi-infinite photonic crystals are treated within the effective-med
ium approach, in which each photonic crystal is represented by a truncated
uniaxial medium whose dielectric tensor components are determinable in term
s of layer thicknesses and dielectric functions of the individual photonic
crystal components. The spontaneous-emission rate is evaluated for a dipole
emitter situated in the slab region, and oscillating at a frequency resona
nt with one of the modes that are localized within the slab and exponential
ly decaying within the photonic crystals. Both symmetric and asymmetric str
uctures are discussed. Interesting features are predicted when the variatio
ns of the adjustable parameters are examined, including suppression and enh
ancement of the spontaneous rate.