27 February 2011

Laser light from conical polymer microcavities

Optical microresonators allow confinement and storage of light in a space with dimensions smaller than the diameter of a hair. Confinement of light in microresonators is based on the simple principle of total reflection: Light is reflected from the resonator surface to be entrapped in the interior. The beams of light run along the edge of the resonators to be stored there for a long time and create an optical “whispering gallery” with a high optical quality. Together, the KIT research group headed by Prof. Heinz Kalt (physics), and the KIT independent junior research group headed by Dr.-Ing. Timo Mappes (engineering) have introduced a novel conical microresonators by applying a tailored thermal reflow process. The microcavities consist of polymers and have diameters of 40 μm. Their high performance and efficiency are due to the extreme smoothness of the polymer surfaces. Incorporating organic dyes in the polymer cavities allows the creation of miniaturized lasers on chip with very low thresholds (3 nJ) benefiting from the high resonator quality by varying the concentration of the dyes or the resonator diameter, the emission wavelengths of the lasers can be changed. This enables to use the microgoblets as novel laser light sources or as extremely sensitive detectors in label-free detection of binding events. Since mass production methods are applied for the development, KIT researchers enable the manufacture of microgoblets in series in the medium term. This work is core of the PhD project of Tobias Großmann, who is member of both research groups at KIT and holds a scholarship grant of Deutsche Telekom Stiftung and is part of Karlsruhe School of Optics and Photonics (KSOP). The microgoblets were first introduced in Applied Physics Letters 96 (1): 013303 (2010), the lasers based on them were published in Applied Physics Letters 97 (6): 063304 (2010

Round Robin Experiment

Raman spectroscopy has already proved its effectiveness in many cases for medical diagnostics such as for cancer, cardiovascular diseases and infections. However, there are no standards in the different working groups, e.g. for sample preparation, implementation of the Raman experiments, spectra pre-treatment, data evaluation, etc.In a round robin experiment, the required groundwork will take place in order to define standardised Raman measurement methods, which will be fundamental for establishing Raman spectroscopy for clinical diagnostic procedures.

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5th International Conference on Biophotonics

20 March 2017

Continuing the success of the previous meetings held in Sacramento, Ottawa, Jena, and Florence, the 5th conference will come to Perth, Western Australia, running over two full days, and back-to-back with the Science on the Swan medical research conference, which delegates are strongly encouraged to also attend, at discounted rates. [more]

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