Optically induced mode splitting in self-assembled, high quality-factor conjugated polymer microcavities

Scientific Reports
Daniel BraamAxel Lorke

Abstract

We investigate the whispering gallery modes (WGMs) of self-assembled single microspheres. They consist of a recently developed highly fluorescent π-conjugated copolymer and exhibit excellent optical properties with Q-factors up to 10(4). Under continuous laser irradiation, we observe a splitting of the highly degenerate spherical WGMs into a multiplet of lines. Comparison with the calculated spectral response of a weakly distorted sphere shows that the optical excitation induces a change of the optical path length in the microcavity so that it resembles a prolate spheroid. The separation of the lines is given by the ellipticity and the azimuthal mode number. Measurements in various gaseous environments suggest that the distortion is caused by light induced oxidation of the polymer. Our findings show that photooxidation can be a beneficial mechanism for in-situ tuning of optically active polymer structures.

References

Aug 15, 2003·Nature·Kerry J Vahala
Jun 24, 2006·Optics Letters·Adam J TrevittMichael D Schuder
Jun 7, 2011·Optics Express·Ilya RazdolskiySilvia Soria
Dec 29, 2012·Journal of the American Chemical Society·Taeko AdachiYohei Yamamoto
Mar 22, 2014·Physical Chemistry Chemical Physics : PCCP·Na SaiGraeme Henkelman
Aug 2, 2014·Scientific Reports·Kenichi TabataYohei Yamamoto

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optical microscopy

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