Abstract
We present a new experimental setup for single molecule spectroscopy using a high efficient mirror arrangement with a geometrical efficiency of 0.77. Signal-to-noise (S/N) ratios up to 90 for single pentacene molecules in a p-terphenyl crystal demonstrate that increasing the detection efficiency improves the S/N ratio if the detection geometry ensures a strong stray light suppression. This is realized by the presented mirror arrangement. The experiments were done in a He contact gas cryostat, which is able to work below the lambda point. Temperatures down to 1.7 K at the sample were obtained.
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