Title :
Hexagonal Prism Blue Laser Diode with Low Threshold Power using Whispering Gallery Mode (WGM) Resonances
Author :
Kim, Sangho ; Sands, Timothy D.
Author_Institution :
Purdue University, West Lafayette
Abstract :
In this work, electrically pumped room temperature emitters using hexagonal prism cavities have been fabricated. The hexagonal prism shape provides a route to atomically smooth facets through selective growth or post etching annealing treatments, exploiting the natural crystal form of the wurtzite-structured nitride heterostructures. The lasing mode of the hexagonal prism diodes was verified as WGM by using focused ion beam (FIB) to notch one of the hexagon facets. The threshold current density and forward voltage of the hexagonal prism laser diode were 7kA/cm2 and 9V, respectively. WGM and TIR are believed to be the main mechanisms for reduced reflection losses and increased overall resonance efficiency.
Keywords :
annealing; current density; etching; focused ion beam technology; laser beams; laser modes; light emitting diodes; optical fabrication; optical prisms; semiconductor lasers; whispering gallery modes; FIB; electrically pumped room temperature emitters; focused ion beam; hexagonal prism blue laser diode; hexagonal prism cavities; lasing mode; low threshold power; natural crystal; planar LED; post etching annealing treatment; reflection losses; threshold current density; voltage 9 V; whispering gallery mode resonances; wurtzite-structured nitride heterostructures; Annealing; Atomic beams; Diode lasers; Etching; Ion beams; Resonance; Shape; Temperature; Threshold current; Whispering gallery modes;
Conference_Titel :
Device Research Conference, 2007 65th Annual
Conference_Location :
Notre Dame, IN
Print_ISBN :
978-1-4244-1101-6
Electronic_ISBN :
1548-3770
DOI :
10.1109/DRC.2007.4373669
