Dresden 2011 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 15: Poster 1: Quanteninformation, Quanteneffekte, Laserentwicklung, Laseranwendungen, Ultrakurze Pulse, Photonik

Q 15.60: Poster

Montag, 14. März 2011, 16:30–19:30, P1

Novel Technology for Highly Sensitive Gas Sensors — •Sven Blom, Mahamoud Ahmad, Jyoti Shrestha, Nico Storch, Usman Masud, Sandra Schink, Basim Kudhair, and Hartmut Hillmer — Institute of Nanostructure Technologies and Analytics, University of Kassel, 34132 Kassel, Germany

Modern industrial and medical applications require precise sensing of substances, e.g. pollutants or biomarkers. Commercially available sensors are very cost intensive and due to their size hard to handle or to implement. Moreover, size-reduced sensors do not reach the required sensitivity. A novel technology sensor system, developed at the INA, has the potential to combine miniaturization, high sensitivity and a low cost production.

The concept of our optical system is the reaction of a semiconductor laser to slight variation of its resonator parameters. For a very high sensitivity a two mode laser-system is used, in which both modes are brought into an artificial intensity equilibrium. One of the two modes is tuned to a characteristic absorption line of the substance to be analyzed. Even an extremely small amount of molecules introduced into the resonator results in an intensity difference which is coevally correlated to the gas concentration.

Conventional gas sensors require a photomultiplier. In contrast, our system measures the mode competition by means of "relative intensity noise" (RIN). This electrical evaluation also enables the miniaturization of our system. Due to this and the possibility to tailor this sensor for individual substances, the application field becomes very broad.