Single mode operation 1.3 μm InAs quantum dot lasers based on small mode volume qL2 photonic crystal nano-cavity

C. J. Wang, Y. C. Tseng, J. I. Chyi, W. Y. Chen, T. M. Hsu, M. H. Shih

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

1 Scopus citations

Abstract

We design a quasi-L2 (qL2) photonic crystal nano-cavity (PCN), which has a very small mode volume Vm of 1.6(λ/2n)3 and a reasonably high Q value of 15,000 theoretically. By manipulating the radii of air holes, the mode spacing is extended and a single defect mode operation within the gain spectrum of InAs QDs is achieved. A room temperature operation InAs QDs PCN laser with an ultra-low threshold power of 0.8 μW, corresponding to effective absorption power of less than 100 nW, is realized. Fitting the measured data to the theoretical estimation by coupled rate equation model, a high spontaneous emission coupling efficiency of 80% is obtained. We ascribe this encouraging performance to strong Purcell effect as a result of a small Vm and high coupling efficiency of the cavity.

Original languageEnglish
Title of host publication4th IEEE International NanoElectronics Conference, INEC 2011
DOIs
StatePublished - 2011
Event4th IEEE International Nanoelectronics Conference, INEC 2011 - Tao-Yuan, Taiwan
Duration: 21 Jun 201124 Jun 2011

Publication series

NameProceedings - International NanoElectronics Conference, INEC
ISSN (Print)2159-3523

Conference

Conference4th IEEE International Nanoelectronics Conference, INEC 2011
Country/TerritoryTaiwan
CityTao-Yuan
Period21/06/1124/06/11

Keywords

  • photonic crystal nano-cavity
  • Purcell effect
  • quantum dot laser

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