Innovations through hair-thin optical fibers

Innovations through hair-thin optical fibres
Carlos Saavedra (left) and Deepak Pandey (right) prepare the optical microfilter for test measurements. Credit: Uni Bonn

Scientists at the University of Bonn have built hair-thin optical fiber filters in a very simple way. They are not only extremely compact and stable, but also color-tunable. This means they can be used in quantum technology and as sensors for temperature or for detecting atmospheric gases. The results have been published in the journal Optics Express.

Optical fibers not much thicker than a human hair today not only constitute the backbone of our world-wide information exchange. They are also the basis for building extremely compact and robust sensors with very high sensitivity for temperature, chemical analysis and much more.

Optical resonators or filters are important components cutting out very narrow spectral lines from white sources. In the simplest case such filters are built from two opposing mirrors tossing light back and forth as precisely as the pendulum of a clock work. The color of the filtered light is set by the mirror separation.

Suitable mirrors with high quality have been integrated with the end of such hairlike fibers for some time. Researchers of the University of Bonn have succeeded to build in a simple way such hairlike resonators. They are not only extremely compact and stable but also allow to tune their color: they have glued the fiber ends carrying the mirrors into a common ferrule which can be stretched by means of a piezo crystal and hence control the mirror separation.

Innovations through hair-thin optical fibres
The miniaturized optical filter is located in the central slot of the sleeve mount. Credit: © Uni Bonn

"The miniaturized optical filter makes a further contribution to making photonics and quantum technologies the decisive technology of the 21st century," says Prof. Dr. Dieter Meschede from the Institute of Applied Physics at University of Bonn. The scientist is a member of "Matter and light for quantum computing" (ML4Q) Cluster of Excellence of the Universities of Bonn and Cologne and RWTH Aachen University and is also a member of the Transdisciplinary Research Area "Building Blocks of Matter and Fundamental Interactions" at the University of Bonn.

Miniaturized highly stable optical precision filters are promising multiple applications: they can store light energy within such a small volume such that already single photons can be efficiently stored and manipulated. Their suggests to build extremely compact and selective sensors, e.g. for detecting atmospheric gases. Using even more stable materials for the ferrule tiny optical clock works with extremely high frequency stability may be built.


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More information: Carlos Saavedra et al, Tunable fiber Fabry-Perot cavities with high passive stability, Optics Express (2020). DOI: 10.1364/OE.412273
Journal information: Optics Express

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Citation: Innovations through hair-thin optical fibers (2021, January 21) retrieved 12 June 2021 from https://phys.org/news/2021-01-hair-thin-optical-fibers.html
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