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Ultralow Lasing Thresholds of \pi -Type Supermodes in Cyclic Photonic Molecules Composed of Submicron Disks With Monopole and Dipole Modes

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4 Author(s)
Smotrova, E.I. ; Inst. of Radio-Phys. & Electron., Kharkov ; Nosich, A.I. ; Benson, T.M. ; Sewell, P.

Cyclic photonic molecules (CPMs) composed of an even number of identical submicron-size circular-disk active resonators in free space are studied in two dimensions. Cold-cavity lasing frequencies and threshold values of material gain are extracted from an electromagnetic eigenvalue problem with exact boundary and radiation conditions. We show that assembling several small cavities in a tightly packed CPM efficiently lowers the thresholds of optically coupled nonwhispering-gallery modes of the lowest values (i.e., 0 and 1) of the azimuth index in each cavity provided that high antisymmetry is arranged

Published in:

Photonics Technology Letters, IEEE  (Volume:18 ,  Issue: 19 )