Investigation on colloidal Te doped CdSe (CdSe:Te) quantum dots suspension in a liquid-core fiber

Pilz, Soenke; Romano, Valerio (2012). Investigation on colloidal Te doped CdSe (CdSe:Te) quantum dots suspension in a liquid-core fiber. In: Kalli, Kyriacos; Mendez, Alexis (eds.) Microstructured and Specialty Optical Fibres. Proceedings of SPIE: Vol. 8426 (p. 842603). Bellingham: SPIE 10.1117/12.922225

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Here, we demonstrate the use of a colloidal CdSe:Te quantum dots suspension as active liquid-core in a specially designed optical element, based on a double-clad optical fiber structure. The liquid-core fiber was realized by filling the hollow core of a capillary and waveguiding of the core was ensured by using a liquid host that exhibits a larger refractive index than the cladding material of the capillary. Since the used capillary possessed a cladding waveguide structure, we obtained a liquid-core double-clad structure. To seal the liquid-core fiber and e.g. prevent the formation of bubbles, we developed a technique based on SMA connectors. The colloidal CdSe:Te quantum dots were excited by cladding-pumping using a pump laser at 532nm operating in the continuous-wave regime. We investigated the photoluminescence emitted from the colloidal CdSe:Te quantum dots suspension liquid-core and guided by the double-clad fiber structure. We observed a red shift of the (core) emission, that depends on the liquid-core fiber length and the pump power. This shift is due to the absorption of unexcited colloidal quantum dots and due to the waveguiding properties of the core. Here we report a core photoluminescence output power of 79.2μW (with an integrated brightness of ≈ 215.5 W/cm2sr ). Finally, we give an explanation, why lasing could not be observed in our experiments when setup as a liquid-core fiber cavity.

Item Type:

Conference or Workshop Item (Paper)

Division/Institute:

08 Faculty of Science > Institute of Applied Physics

UniBE Contributor:

Pilz, Sönke and Romano, Valerio

Subjects:

600 Technology > 620 Engineering

Series:

Proceedings of SPIE

Publisher:

SPIE

Language:

English

Submitter:

Factscience Import

Date Deposited:

04 Oct 2013 14:43

Last Modified:

08 Jun 2016 10:36

Publisher DOI:

10.1117/12.922225

URI:

https://boris.unibe.ch/id/eprint/17936 (FactScience: 225773)

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