Strong exciton-photon coupling with colloidal quantum dots in a high- Q bilayer microcavity

Noel C. Giebink, Gary P. Wiederrecht, Michael R. Wasielewski

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Abstract

We demonstrate evanescently coupled bilayer microcavities with Q -factors exceeding 250 fabricated by a simple spin-coating process. The cavity architecture consists of a slab waveguide lying upon a low refractive index spacer layer supported by a glass substrate. For a lossless guide layer, the cavity Q depends only on the thickness of the low index spacer and in principle can reach arbitrarily high values. We demonstrate the versatility of this approach by constructing cavities with a guide layer incorporating CdSe/ZnS core/shell quantum dots, where we observe strong coupling and hybridization between the 1S(e)-1S3/2(h) and 1S(e)-2S3/2(h) exciton states mediated by the cavity photon. This technique greatly simplifies the fabrication of high- Q planar microcavities for organic and inorganic quantum dot thin films and opens up new opportunities for the study of nonlinear optical phenomena in these materials.

Original languageEnglish
Article number081103
JournalApplied Physics Letters
Volume98
Issue number8
DOIs
Publication statusPublished - Feb 21 2011

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ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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