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Low-threshold lasing in novel microdisk geometries

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5 Author(s)
Corbett, B. ; Nat. Microelectron. Res. Centre, Univ. Coll. Cork, Ireland ; Justice, J. ; Considine, L. ; Walsh, S.
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We have fabricated arrays of semiconductor microdisks with diameters from 3.5-9 μm using wet chemical etching in combination with epitaxial lift-off and metallic bonding techniques. The microdisks are supported on glass for higher optical confinement and to allow novel annular geometries. The optically pumped microdisks have high-Q (>2000) modes, low-pump thresholds (<20 μW) and multimode lasing at liquid nitrogen temperatures. Successive modes are excited by temperature tuning the bandgap.

Published in:

Photonics Technology Letters, IEEE  (Volume:8 ,  Issue: 7 )