Silicon nanocrystals on bottle resonators: Mode structure, loss mechanisms and emission dynamics

被引：20
作者：
Bianucci, P. [1 ]
Wang, X. [1 ,3 ]
Veinot, J. G. C. [2 ]
Meldrum, A. [1 ,3 ]
机构：
[1] Univ Alberta, Dept Phys, Edmonton, AB T6G 2G7, Canada
[2] Univ Alberta, Dept Chem, Edmonton, AB T6G 2G2, Canada
[3] CNR, Natl Inst Nanotechnol, Edmonton, AB T6G 2M9, Canada
来源：
OPTICS EXPRESS | 2010年 / 18卷 / 08期
基金：
加拿大自然科学与工程研究理事会;
关键词：
WHISPERING-GALLERY MODES; OPTICAL GAIN; ABSORPTION; SCATTERING; LIGHT;
D O I：
10.1364/OE.18.008466
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
Bottle resonators can support high Q-factor whispering gallery modes (WGMs) and demonstrate a rich mode spectrum. Resonators were fabricated using a fiber tapering apparatus and were coated with a thin, smooth layer of luminescent silicon nanocrystals. The photoluminescence spectrum showed WGM peaks with Q-factors near 2,500; however, evanescent measurements showed that these modes are a composite of many modes with Q-factors exceeding 10(6), the highest yet seen for a silicon-nanocrystal-coated microresonators. The mode structure showed strong polarization and sensitivity to position within the bottle resonator. An analysis of loss mechanisms establishes surface roughness scattering as the limiting factor in these nanocrystal-coated bottle resonators in the absence of excited carriers. (C) 2010 Optical Society of America
引用
收藏
页码：8466 / 8481
页数：16
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