Modification of spontaneous emission rate of micrometer-sized light sources using hollow-core photonic crystal fibers

We investigate numerically and experimentally the modification ofthe spontaneous emission rate for micrometer-sized light sourcesembedded in a hollow-core photonic crystal fiber (HCPCF). Thediameter of the light source is deliberately chosen such that theycould be easily introduced into the central hole of the hollow-corephotonic crystal fiber by capillary force. The photoluminescencefrom the microparticles is measured by using an inverted microscopein combination with a spectrometer. The modification of the spontaneousemission rate is observed in a wavelength region where there is noband gap. The experimental observations are consistent withthe simulation results obtained by the plane wave expansion andfinite-difference time-domain techniques.