SKM 2023 – scientific programme

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O: Fachverband Oberflächenphysik

O 70: Poster: Plasmonics and Nanooptics II

O 70.7: Poster

Wednesday, March 29, 2023, 18:00–20:00, P2/EG

A room temperature tunable scanning fiber Fabry-Pérot cavity microscope — •Lars Denzer, Paul Steinmann, and Stefan Linden — Physikalisches Institut, Universität Bonn, Nussallee 12, 53115 Bonn, Germany

Since the technological advancements in the fabrication of ultra-smooth concave fiber surfaces, fiber-based Fabry-Pérot cavities (FFPCs) are a field of ongoing research. Many applications emerged, ranging from light-matter coupling utilizing very small mode volumes over cavity-enhanced sensing, to cavity microscopy. Here, we report on the construction and test of a tunable scanning fiber Fabry-Pérot cavity microscope operating at room temperature. To this end, we fabricated a concave metallic mirror on the facet of an optical fiber. Using a focused CO2 laser beam, we achieve an ultra-smooth Gaussian depression at the fiber facet. Afterwards, the fiber is gold-coated in an evaporation chamber. Coarse tuning of the cavity is possible by the use of a 3D-piezo stage and the cavity length is fine-tuned by a shear piezo. Laterally scanning the cavity enables a mapping of the sample surface. As a first test, we investigate the coupling of a MoSe2 monolayer to the cavity field.