X-ray spectra of spontaneous emission in the bandgap of a 1D photonic crystal
Résumé
The alteration by Purcell effect of the spontaneous emission spectrum from within one-dimensional photonic band gap crystal is investigated in the x-ray domain. The Si L2,3 emission band from a bulk specimen is recorded by means of an original spectroscopic instrument and regarded as a reference spectrum. A Mo/Si periodic multilayered structure forming a one-dimensional photonic crystal (1D-PC) is considered. The Si L2,3 spectrum is calculated from the reference spectrum when the spontaneously emitted radiation is Bragg diffracted by the1D-PC. It appears that the spectrum from the 1D-PC in the Bragg condition is considerably modified with respect to the reference spectrum with a strong inhibition of the emission within the band gap. The anomalous Lamb optical shift of the spontaneous emission from the 1D-PC is also estimated ; it is shown that this shift cannot be observed with a mere standard x-ray spectrometer.
Domaines
Physique [physics]Origine | Fichiers produits par l'(les) auteur(s) |
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