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	Mode coupling and vertical radiation loss for whispering-gallery modes in 3-d microcavities
	Huang, Yong-Zhen1,2; Yang, Yue-De1
刊名	Journal of lightwave technology
	2008-05-01
卷号	26期号:9-12页码:1411-1416
关键词	Finite-difference time-domain technique (fdtd) Microcavities Optical resonators Quality factor
ISSN号	0733-8724
DOI	10.1109/jlt.2008.922167
通讯作者	Huang, yong-zhen()
英文摘要	The characteristics of whispering-gallery modes (wgms) in 3-d cylindrical, square, and triangular microcavities with vertical optical confinement of semiconductors are numerically investigated by the finite-difference time-domain (fdtd) technique. for a microcylinder with a vertical refractive index 3.17/3.4/3.17 and a center layer thickness 0.2 mu m, q-factors of transverse electric (te) wgms around wavelength 1550 nm are smaller than 10(3), as the radius r < 4 mu m and reach the orders of 10(4) and 10(6) as r = 5 and 6 mu m, respectively. however, the q-factor of transverse magnetic (tm) wgms at wavelength 1.659 mu m reaches 7.5 x 10(5) as r = 1 mu m. the mode coupling between the wgms and vertical radiation modes in the cladding layer results in vertical radiation loss for the wgms. in the microcylinder, the mode wavelength of tm wgm is larger than the cutoff wavelength of the vertical radiation mode with the same mode numbers, so tm wgms cannot couple with the vertical radiation mode and have high q-factor. in contrast, te wgms can couple with the corresponding vertical radiation mode in the 3-d microcylinder as r < 5 mu m. however, the mode wavelength of the te wgm approaches (is larger than) the cutoff wavelength of the corresponding radiation modes at r = 5 mu m (6 mu m), so te wgms have high q-factors in such microcylinders too. the results show that a critical lateral size is required for obtaining high, q-factor te wgms in the 3-d microcylinder. for 3-d square and triangular microcavities, we also find that the q-factor of tm wgm is larger than that of te wgm.
WOS关键词	ROOM-TEMPERATURE OPERATION ; MICRODISK LASERS ; RESONATORS ; EMISSION
WOS研究方向	Engineering ; Optics ; Telecommunications
WOS类目	Engineering, Electrical & Electronic ; Optics ; Telecommunications
语种	英语
出版者	IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
WOS记录号	WOS:000256971400046
内容类型	期刊论文
URI标识	http://www.corc.org.cn/handle/1471x/2427197
专题	半导体研究所
通讯作者	Huang, Yong-Zhen
作者单位	1.Chinese Acad Sci, Inst Semicond, State Key Lab Integrated Optoelect, Beijing 100083, Peoples R China 2.Huaqiao Univ, Coll Informat Sci & Engn, Quanzhou 362021, Fujian, Peoples R China
推荐引用方式 GB/T 7714	Huang, Yong-Zhen,Yang, Yue-De. Mode coupling and vertical radiation loss for whispering-gallery modes in 3-d microcavities[J]. Journal of lightwave technology,2008,26(9-12):1411-1416.
APA	Huang, Yong-Zhen,&Yang, Yue-De.(2008).Mode coupling and vertical radiation loss for whispering-gallery modes in 3-d microcavities.Journal of lightwave technology,26(9-12),1411-1416.
MLA	Huang, Yong-Zhen,et al."Mode coupling and vertical radiation loss for whispering-gallery modes in 3-d microcavities".Journal of lightwave technology 26.9-12(2008):1411-1416.

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