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 15.15: Poster
Montag, 14. März 2011, 16:30–19:30, P1
Broadband polarization control and preservation for scanning near-field optical microscopy — •Christoph Zeh1, Ron Spittel2, Sonja Unger2, Jörg Opitz1, Bernd Köhler1, Johannes Kirchhof2, Hartmut Bartelt2, and Lukas M. Eng3 — 1Fraunhofer Institut für Zerstörungsfreie Prüfverfahren IZFP, Institutsteil Dresden, Maria-Reiche-Str. 2, 01109, Dresden — 2Institut für Photonische Technologien, Albert-Einstein-Str. 9, 07745 Jena, Deutschland — 3Institut für Angewandte Photophysik, Technische Universität Dresden, 01062 Dresden, Deutschland
To achieve high throughput with apertureless fiber probes for scanning near-field optical microscopy (SNOM) radial polarized, non-fundamental fiber modes can be used. A radial polarized fiber mode can be converted efficiently into a propagating surface plasmon mode on the metal coating of the probe, leading to a highly focused spot at the tip apex. Since for our index-tailored fiber (ITF) the first higher order modes have well separated effective indices, mode coupling due to external stress (e.g. bending, twist) is suppressed. This allows for transmitting radial and other complex states of polarization through the fiber for SNOM and many other applications. Here, we show how we can control the state of polarization of non-fundamental modes in an ITF by selective mode excitation using mechanical long period gratings. A mayor advantage of the ITF is its broad wavelength range of 1000 nm to 1600 nm. We will show first results of translating this behavior from infrared to visible wavelength.