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Authors: I. Moreels, B. De Geyter, D. Van Thourhout, Z. Hens
Title: Transmission of a quantum-dot-silicon-on-insulator hybrid notch filter
Format: International Journal
Publication date: 6/2009
Journal/Conference/Book: Journal of the Optical Society of America B-Optical Physics
Editor/Publisher: Optical Society of America, 
Volume(Issue): 26(6) p.1243-1247
DOI: 10.1364/josab.26.001243
Citations: 7 ( - last update: 14/7/2024)
6 (OpenCitations - last update: 3/5/2024)
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Colloidal PbS and PbSe quantum dots are mixed with polystyrene and spincoated on top of a silicon-on-insulator microring notch filter. We demonstrate that the light propagating through the ring resonator strongly interacts with the quantum-dot doped thin film. This allows us to efficiently tune the output of the notch filter by varying the quantum-dot size and concentration. As a result, the hybrid devices can exhibit critical coupling only for a single resonance or display a constant extinction ratio over a wide spectral range. Considering the promising nonlinear optical properties of colloidal quantum dots, our results open new pathways for all-optical signal processing applications on a silicon platform.

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