Polymer-embedded colloidal lead-sulfide nanocrystals integrated to vertically slotted silicon-based ring resonators for telecom applications

Markus Humer; Romain Guider; Florian Hackl; Thomas Fromherz

doi:10.1117/1.JNP.7.073076

27 November 2013 Polymer-embedded colloidal lead-sulfide nanocrystals integrated to vertically slotted silicon-based ring resonators for telecom applications

Markus Humer, Romain Guider, Florian Hackl, Thomas Fromherz

Author Affiliations +

Journal of Nanophotonics, Vol. 7, Issue 1, 073076 (November 2013). https://doi.org/10.1117/1.JNP.7.073076

Abstract

The main drawback of the rapidly evolving field of silicon photonics lies in the absence of efficient monolithically integrated radiation sources as a consequence of the indirect bandgap of Si and Ge. Relevant alternatives based on the hybrid combination of Si with optically active materials have to be technologically simple, temporally stable, and provide efficient coupling to the Si waveguides. Lead-sulfide nanocrystals (NCs) were blended into a polymer resist suitable for deep-UV- and electron-beam lithography and integrated into Si-based vertically slotted waveguides and ring resonators. The polymer both stabilizes the NC’s photoluminescence emission against degradation under ambient conditions and allows lithographic patterning of this compound material. After integration into the optoelectronic structures and upon optical pumping, intense photoluminescence emission from ring resonators was recorded at the output of bus-waveguides. The resonator quality factors were investigated for polymer-NC compounds with NC concentrations in the range between 0.1 and 8 vol%. The spontaneous emission rate enhancement for vertically slotted resonators was estimated to be a factor of two higher as compared to unslotted ones. The stable integration of colloidal NCs as well as the improved light coupling to silicon circuits is an important step in the development of silicon-based hybrid photonics.

CC BY: © The Authors. Published by SPIE under a Creative Commons Attribution 4.0 Unported License. Distribution or reproduction of this work in whole or in part requires full attribution of the original publication, including its DOI.

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Markus Humer, Romain Guider, Florian Hackl, and Thomas Fromherz "Polymer-embedded colloidal lead-sulfide nanocrystals integrated to vertically slotted silicon-based ring resonators for telecom applications," Journal of Nanophotonics 7(1), 073076 (27 November 2013). https://doi.org/10.1117/1.JNP.7.073076

Published: 27 November 2013

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KEYWORDS

Resonators

Polymers

Waveguides

Silicon

Nanocrystals

Polarization

Lead

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