DocumentCode :
881090
Title :
Ultralow threshold and single-mode lasing in microgear lasers and its fusion with quasi-periodic photonic crystals
Author :
Nozaki, Kengo ; Nakagawa, Atsuo ; Sano, Daisuke ; Baba, Toshihiko
Author_Institution :
Dept. of Electr. & Comput. Eng., Yokohama Nat. Univ., Japan
Volume :
9
Issue :
5
fYear :
2003
Firstpage :
1355
Lastpage :
1360
Abstract :
The GaInAsP microgear laser is a kind of microdisk laser but has a rotationally symmetric grating, which matches with the profile of the whispering gallery mode. In this study, we achieved the room temperature continuous-wave lasing with a threshold photopump power of 14 μW for the smallest gear diameter of 2.02 μm. We also observed the single-mode lasing in a deep grating device, where the π-phase-shifted nonlasing mode completely disappeared. The experimental results were well explained by a three-dimensional finite-difference time-domain calculation and a consideration on the surface recombination. In addition, to increase the variety of the microgear, we proposed its fusion with a quasi-periodic photonic crystal (QPC), which also has a rotational symmetry. We theoretically estimated a sufficiently high Q of 21 600 for a QPC gear with a point defect of 1.6-μm diameter, which is the smallest limit for a normal microdisk at a wavelength of 1.5-1.6 μm.
Keywords :
III-V semiconductors; finite difference time-domain analysis; gallium compounds; indium compounds; microcavity lasers; microdisc lasers; photonic crystals; semiconductor lasers; surface recombination; GaInAsP; GaInAsP microgear laser; microdisk laser; point defect; quasiperiodic photonic crystals; room temperature continuous-wave lasing; rotationally symmetric grating; single-mode lasing; surface recombination; three-dimensional finite-difference time-domain calculation; ultralow threshold lasing; whispering gallery mode; Finite difference methods; Gears; Gratings; Laser fusion; Laser modes; Photonic crystals; Spontaneous emission; Temperature; Time domain analysis; Whispering gallery modes;
fLanguage :
English
Journal_Title :
Selected Topics in Quantum Electronics, IEEE Journal of
Publisher :
ieee
ISSN :
1077-260X
Type :
jour
DOI :
10.1109/JSTQE.2003.819465
Filename :
1263973
Link To Document :
بازگشت