Low threshold, room-temperature microdisk lasers in the blue spectral range

Low threshold, room-temperature microdisk lasers in the blue spectral range

Threshold reduction in pierced microdisk lasers

GaAs microdisk lasers with holes pierced through the disk surface are investigated for their threshold characteristics. Disks are fabricated with either a single hole or two diametrically opposite holes at various distances from the disk outer edge. Even though the disk area is reduced by only 1%, we find that the lasing threshold for a disk with one hole is reduced by up to 50% compared to a d...

Threshold characteristics of semiconductor microdisk lasers

Whispering-gallery mode microdisk lasers using optical’ and electrical2 excitation have recently been demonstrated. The initial experiments* and results described here use continuous-wave optical excitation at liquid-nitrogen temperatures. The threshold characteristics of these microlasers are studied here as the small volume limit is approached where there is a single optical mode within the g...

Extremely low room-temperature threshold current density diode lasers using InAs dots in In0.15Ga0.85As quantum well

Introduction: It has been predicted that the threshold current density of quantum dot lasers should be lower than that of quantum well lasers due to the reduction of density of states [1]. In particular, efforts have been made in the past few years to reduce the threshold current density of quantum dot lasers on GaAs substrates [2, 3]. A recently developed approach is to put the InAs dots in a ...

Extreme ultra-low lasing threshold of full-polymeric fundamental microdisk printed with room-temperature atmospheric ink-jet technique

We experimentally demonstrated an extreme ultra-low lasing threshold from full-polymeric fundamental microdisk cavities fabricated by a novel fabrication method, the ink-jet printing method, which is much simpler and easier than previous methods such as lithography. The ink-jet printing method provides additive, room-temperature atmospheric, rapid fabrication with only two steps: (i) stacking c...