An individual hexagonal ZnO microrod was employed as a whispering-gallery mode (WGM) microcavity to obtain ultraviolet lasing at room temperature. The WGM lasing shows a low threshold, a high quality factor, and distinct mode structure. A typical stimulated emission from the ZnO microrod with diagonal of exhibits a low lasing threshold of . The observed discrete lasing modes match with the simulated positions very well. The spatial distribution of the lasing intensity demonstrates the lasing output direction and provides the direct evidence of the WGM resonant mechanism. We systematically investigated the lasing performance for different sized microrods.
REFERENCES
1.
K.
Govender
, D. S.
Boyle
, P.
O’Brien
, D.
Binks
, and D.
West
, Adv. Mater.
14
, 1221
(2002
).2.
P.
Yang
, H.
Yan
, S.
Mao
, R.
Russo
, J.
Johnson
, R.
Saykally
, N.
Morris
, J.
Pham
, R.
He
, and H. J.
Choi
, Adv. Funct. Mater.
12
, 323
(2002
).3.
H.
Yan
, R.
He
, J.
Pham
, and P. D.
Yang
, Adv. Mater.
15
, 402
(2003
).4.
H.
Cao
, Y. G.
Zhao
, S. T.
Ho
, E. W.
Seelig
, Q. H.
Wang
, and R. P. H.
Chang
, Phys. Rev. Lett.
82
, 2278
(1999
).5.
S. F.
Yu
, C.
Yuen
, S. P.
Lau
, and H. W.
Lee
, Appl. Phys. Lett.
84
, 3244
(2004
).6.
M. H.
Huang
, S.
Mao
, H.
Feick
, H. Q.
Yan
, Y. Y.
Wu
, H.
Kind
, E.
Weber
, R.
Russo
, and P. D.
Yang
, Science
292
, 1897
(2001
).7.
J. H.
Choy
, E. S.
Jang
, J. H.
Won
, J. H.
Chung
, D. J.
Jang
, and Y. W.
Kim
, Adv. Mater.
15
, 1911
(2003
).8.
M. A.
Zimmler
, J. M.
Bao
, F.
Capasso
, S.
Müller
, and C.
Ronning
, Appl. Phys. Lett.
93
, 051101
(2008
).9.
D. S.
Yu
, Y. J.
Chen
, B. J.
Li
, X. D.
Chen
, M. Q.
Zhang
, F. L.
Zhao
, and S.
Ren
, Appl. Phys. Lett.
91
, 091116
(2007
).10.
D.
Wang
, H. W.
Seo
, C. C.
Tin
, M. J.
Bozack
, J. R.
Williams
, M.
Park
, and Y.
Tzeng
, J. Appl. Phys.
99
, 093112
(2006
).11.
L.
Cao
, B.
Zou
, C.
Li
, Z.
Zhang
, S.
Xie
, and G.
Yang
, Europhys. Lett.
68
, 740
(2004
).12.
G. P.
Zhu
, C. X.
Xu
, J.
Zhu
, C. G.
Lv
, and Y. P.
Cui
, Appl. Phys. Lett.
94
, 051106
(2009
).13.
T.
Nobis
and M.
Grundmann
, Phys. Rev. A
72
, 063806
(2005
).14.
J. Z.
Liu
, S.
Lee
, Y. H.
Ahn
, J. Y.
Park
, K. H.
Koh
, and K. H.
Park
, Appl. Phys. Lett.
92
, 263102
(2008
).15.
C.
Czekalla
, C.
Sturm
, R. S.
Grund
, B. Q.
Cao
, M.
Lorenz
, and M.
Grundmann
, Appl. Phys. Lett.
92
, 241102
(2008
).16.
J.
Wiersig
, Phys. Rev. A
67
, 023807
(2003
).© 2009 American Institute of Physics.
2009
American Institute of Physics
You do not currently have access to this content.