![]() ![]() It is a common assumption in the field of cavity electrodynamics that full inhibition of spontaneous emission can only be achieved by placing the atom between mirrors that cover the full solid angle around it, restricting all the vacuum modes resonant with the atom (see, for example, Ref. 35 where the emission rate of a solid state emitter was reduced by a factor of ∼10). 34 where the spontaneous emission rate of a single Rydberg atom was reduced by a factor of ∼20 or Ref. Only a few experiments have demonstrated large inhibitions (see, for example, Ref. 33 While a resonant cavity can increase spontaneous emission rate into a particular mode, inhibiting spontaneous emission requires the suppression of the coupling to all modes. 32 In ion trap systems, strong coupling between a single trapped ion and a fiber cavity has recently been observed. 31 Furthermore, in the realm of solid state emitters, enhancement by a factor of more than 100 has been observed using microcavities. ![]() 27–30 Recently, a fivefold enhancement in spontaneous emission rate has been demonstrated by placing a single atom in a fiber cavity. 26 In particular, large enhancement of emission from a single atom has been achieved using high-finesse cavities. 22,23 The electromagnetic mode structure can be altered by placing the atom close to dielectric interfaces, 24 between two mirrors, 25 or inside photonic structures producing a bandgap. Another way to enhance or reduce spontaneous emission rate of an atom is to modify the electromagnetic vacuum mode structure interacting with the atom.
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