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Off-axis parabolic mirror optics for polarized Raman spectroscopy at low temperature

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arxiv 1702.02086 v1 pith:WU3NUFVG submitted 2017-02-07 physics.ins-det cond-mat.otherphysics.optics

N. Chelwani , D. Hoch , D. Jost , B. Botka , J.-R. Scholz , R. Richter , M. Theodoridou , F. Kretzschmar
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T. Böhm K. Kamarás R. Hackl
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classification physics.ins-detcond-mat.otherphysics.optics
keywords mirrorramanspectroscopytemperatureaperturedevelopmentnear-fieldoptics
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abstract

We report the development of a detection optics for the integration of Raman scattering and scanning probe microscopy at low temperature based on a parabolic mirror. In our set-up half of the paraboloid mirror covers a solid angle of $\pi$ corresponding to a numerical aperture of N.A.\,$\approx 0.85$. The optical system can be used for far- and near-field spectroscopy. In the far field the polarizations can be maintained to within 80-90\%. In combination with a scanning microscope (AFM/STM), tunneling or near-field experiments are possible with less than 10\% loss of aperture. Our set-up provides ideal conditions for the future development of tip-enhanced Raman spectroscopy (TERS) at low temperature.

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