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Polarization mode preservation in elliptical index tailored optical fibers for apertureless scanning near-field optical microscopy

: Zeh, C.; Spittel, R.; Unger, S.; Opitz, J.; Köhler, B.; Kirchhof, J.; Bartelt, H.; Eng, L.M.


Applied Physics Letters 97 (2010), No.10, Art. 103108, 3 pp.
ISSN: 0003-6951
ISSN: 1077-3118
Journal Article
Fraunhofer IZFP, Institutsteil Dresden ( IKTS-MD) ()

We report on the development of elliptical, index tailored optical fibers for higher-order mode preservation for fiber-based, apertureless, internally illuminated scanning near-field optical microscopy (ai-SNOM). The fiber structure is simulated by the finite element method, showing large spreads of the effective indices for neighboring first higher-order modes. We demonstrate experimentally that due to this spread, the first higher-order modes do not couple, hence, the polarization is maintained, when the fiber is bent down to 1 cm radius. Further, we discuss the implications for ai-SNOM applications.