SKM 2021 – scientific programme
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HL: Fachverband Halbleiterphysik
HL 3: Poster Session I
HL 3.14: Poster
Monday, September 27, 2021, 10:00–13:00, P
An ultra-sensitive cavity absorption microscope for hyperspectral imaging of 2D materials — Manuel Nutz1, •Ines Amersdorffer1, Florian Sigger1, Theodor Hänsch2, Alexander Högele2, Christoph Kastl3, and Thomas Hümmer1 — 1Qlibri project, Faculty of Physics, Ludwig-Maximilians-Universität Munich, Germany — 2Faculty of Physics, Ludwig-Maximilians-Universität Munich, Germany — 3Walter Schottky Institute and Physics Department, TU Munich, Garching, Germany
We use a tunable high-finesse optical micro-cavity as a versatile and powerful tool to measure absorption in transition metal dichalcogenides (TMDs) down to the parts-per-million level. Our scanning-cavity imaging technique [1,2], where a microscopic mirror is scanned across a larger mirror that hosts the sample, allows to collect absorption images of 2D materials with unprecedented sensitivity, spatially resolved with 2*m resolution and in real time. Our approach can be extended to allow for spectrally resolved measurements and reveals polarization-dependent absorption, implanted defects, crystal foldings, and bubbles. Furthermore, we present our progress to extend this absorption measurements to cryogenic temperatures. [1] Mader et al., Nat Commun 6, 7249 (2015) [2] Hümmer et al., Nat Commun 7, 12155 (2016)