Regensburg 2019 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 12: HL Poster I
HL 12.19: Poster
Montag, 1. April 2019, 17:30–20:00, Poster E
Highly sensitive micro-cavity based absorption spectroscopy of low dimensional materials — •Thomas Hümmer1,2, Jonathan Noé3, Alexander Högele3, Theodor W. Hänsch1,2, and David Hunger4 — 1Ludwig-Maximilians-Universität München, Deutschland — 2Max-Planck Institut für Quantenoptik, Garching, Deutschland — 3Fakultät für Physik and Center for NanoScience (CeNS), Ludwig-Maximilians-Universität München, D-80539 München — 4Karlsruher Institut für Technologie, Karlsruhe, Deutschland
We use a tunable high-finesse optical micro-cavity [1] to measure absorption in carbon nanotubes (CNTs) and transition metal dichalcogenides (TMDs) down to the parts-per-million level. Our scanning-cavity imaging technique[2,3], where a microscopic mirror is scanned across a larger mirror that hosts the sample, allows to collect absorption images of individual nano-structures with unprecedented sensitivity, spatially resolved with 1*m resolution and in real time. First spectroscopic measurements are performed on these samples. We present our progress to extend this technology to measurements in cryogenic environments. [1] Hunger et al., NJP 12, 065038 (2010) [2] Mader et al., Nat Commun 6, 7249 (2015) [3] Hümmer et al Nat Commun 7, 12155 (2016)