Applied Physics Letters (2009)

Whispering gallery modes in micron-sized SrS:Eu octahedrons
Katleen Korthout, Philippe F. Smet, Dirk Poelman
Applied Physics Letters 94 (2009) 51104

Optical whispering gallery modes were observed in micron-sized SrS:Eu2+ octahedrons. Cathodoluminescence in a scanning electron microscope was used to evaluate the emission characteristics of individual octahedrons with various sizes. The resonance modes superposed on the orange Eu2+ broadband emission were explained by a plane wave model, taking the wavelength dispersion of the refractive index into account. The resonance modes occur in the three equatorial planes in the octahedrons, which were approximated by corner-cut square disks.


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