Michael Förg
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View article: Seeing the Unseen -- Boosted Absorption Imaging and Spectroscopy Using a Scanning Microresonator
Seeing the Unseen -- Boosted Absorption Imaging and Spectroscopy Using a Scanning Microresonator Open
Optical detection of nanoscale objects without relying on fluorescence is a current challenge due to their extremely weak interaction with light. Resonator-enhanced absorption microscopy is a novel tool to heavily boost the light-matter in…
View article: Ultra-Sensitive Extinction Measurements of Optically Active Defects in Monolayer MoS<sub>2</sub>
Ultra-Sensitive Extinction Measurements of Optically Active Defects in Monolayer MoS<sub>2</sub> Open
We utilize cavity-enhanced extinction spectroscopy to directly quantify the optical absorption of defects in MoS2 generated by helium ion bombardment. We achieve hyperspectral imaging of specific defect patterns with a detection limit belo…
View article: Spectral asymmetry of phonon sideband luminescence in monolayer and\n bilayer WSe2
Spectral asymmetry of phonon sideband luminescence in monolayer and\n bilayer WSe2 Open
We report an experimental study of temperature-dependent spectral lineshapes\nof phonon side-band emission stemming from dark excitons in monolayer and\nbilayer WSe$_{2}$. Using photoluminescence spectroscopy in the range from 4 to\n100K, …
View article: Spectral asymmetry of phonon sideband luminescence in monolayer and bilayer WSe2
Spectral asymmetry of phonon sideband luminescence in monolayer and bilayer WSe2 Open
We report an experimental study of temperature-dependent spectral lineshapes of phonon side-band emission stemming from dark excitons in monolayer and bilayer WSe$_{2}$. Using photoluminescence spectroscopy in the range from 4 to 100K, we …
Polariton hyperspectral imaging of two-dimensional semiconductor crystals Open
Atomically thin crystals of transition metal dichalcogenides (TMDs) host excitons with strong binding energies and sizable light-matter interactions. Coupled to optical cavities, monolayer TMDs routinely reach the regime of strong light-ma…
View article: Cavity-control of interlayer excitons in van der Waals heterostructures
Cavity-control of interlayer excitons in van der Waals heterostructures Open
Monolayer transition metal dichalcogenides integrated in optical microcavities host exciton-polaritons as a hallmark of the strong light-matter coupling regime. Analogous concepts for hybrid light-matter systems employing spatially indirec…
The role of momentum-dark excitons in the elementary optical response of bilayer WSe2 Open
Monolayer transition metal dichalcogenides (TMDs) undergo substantial changes in the single-particle band structure and excitonic optical response upon the addition of just one layer. As opposed to the single-layer limit, the bandgap of bi…
View article: Polariton hyperspectral imaging of two-dimensional semiconductor\n crystals
Polariton hyperspectral imaging of two-dimensional semiconductor\n crystals Open
Atomically thin crystals of transition metal dichalcogenides (TMDs) host\nexcitons with strong binding energies and sizable light-matter interactions.\nCoupled to optical cavities, monolayer TMDs routinely reach the regime of\nstrong light…
View article: Identifying optical signatures of momentum-dark excitons in transition metal dichalcogenide monolayers
Identifying optical signatures of momentum-dark excitons in transition metal dichalcogenide monolayers Open
Transition metal dichalcogenide (TMD) monolayers (MLs) exhibit rich photoluminescence spectra associated with interband optical transitions of direct-gap semiconductors. Upon absorption of photons, direct excitons with zero center-of-mass …
View article: Identifying optical signatures of momentum-dark excitons in transition\n metal dichalcogenide monolayers
Identifying optical signatures of momentum-dark excitons in transition\n metal dichalcogenide monolayers Open
Transition metal dichalcogenide (TMD) monolayers (MLs) exhibit rich\nphotoluminescence spectra associated with interband optical transitions of\ndirect-gap semiconductors. Upon absorption of photons, direct excitons with\nzero center-of-ma…
View article: Cavity-control of bright and dark interlayer excitons in van der Waals heterostructures
Cavity-control of bright and dark interlayer excitons in van der Waals heterostructures Open
Monolayer (ML) transition metal dichalcogenides (TMDs) integrated in optical microcavities host exciton-polaritons as a hallmark of the strong light-matter coupling regime. Analogous concepts for hybrid light-matter systems employing spati…