Investigation of ultrasmall volume microdisk cavities with embedded quantum dots

Ultrasmall volume (V
_eff
~ 2(lambda/n)
³
), fiber-coupled microdisks with embedded quantum dots are studied. Quality factors > 10
⁵
, laser thresholds of ~ 1 muW, and differential (out-coupling) efficiencies of 16% (28%) are measured, and a spontaneous emission factor of 16% is estimated.