Whispering-gallery modes and light emission from a Si-nanocrystal-based single microdisk resonator

被引：47

作者：

Ghulinyan, Mher ^{[1
]}

Navarro-Urrios, Daniel ^{[2
]}

Pitanti, Alessandro ^{[2
]}

Lui, Alberto ^{[3
]}

Pucker, Georg ^{[1
]}

Pavesi, Lorenzo ^{[2
]}

机构：

[1] Fdn Bruno Kessler, Microtechnol Lab, I-38050 Trento, Italy

[2] Univ Trent, Dept Phys, Nanosci Lab, I-38050 Trento, Italy

[3] Fdn Bruno Kessler, Mat & Analyt Methods Lab Biosensors & Bioelect, I-38050 Trento, Italy

来源：

OPTICS EXPRESS | 2008年 / 16卷 / 17期

关键词：

D O I：

10.1364/OE.16.013218

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

We report on visible light emission from Si-nanocrystal based optically active microdisk resonators. The room temperature photoluminescence (PL) from single microdisks shows the characteristic modal structure of whispering-gallery modes. The emission is both TE and TM-polarized in 300 nm thick microdisks, while thinner ones (135 nm) support only TE-like modes. Thinner disks have the advantage to filter out higher order radial mode families, allowing for measuring only the most intense first order modal structure. We reveal subnanometer linewidths and corresponding quality factors as high as 2800, limited by the spectral resolution of the experimental setup. Moreover, we observe a modification of mode linewidth by a factor 13 as a function of pump power. The origin of this effect is attributed to an excited carrier absorption loss mechanism. (C) 2008 Optical Society of America.

引用

页码：13218 / 13224

页数：7

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