Ultra-Sensitive Extinction Measurements of Optically Active Defects in Monolayer MoS2
The Journal of Physical Chemistry Letters, 2022•ACS Publications
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 below 0.01% extinction,
corresponding to a detectable defect density below 1× 1011 cm–2. The corresponding
spectra reveal a broad subgap absorption, being consistent with theoretical predictions
related to sulfur vacancy-bound excitons in MoS2. Our results highlight cavity-enhanced …
of defects in MoS2 generated by helium ion bombardment. We achieve hyperspectral
imaging of specific defect patterns with a detection limit below 0.01% extinction,
corresponding to a detectable defect density below 1× 1011 cm–2. The corresponding
spectra reveal a broad subgap absorption, being consistent with theoretical predictions
related to sulfur vacancy-bound excitons in MoS2. Our results highlight cavity-enhanced …
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 below 0.01% extinction, corresponding to a detectable defect density below 1 × 1011 cm–2. The corresponding spectra reveal a broad subgap absorption, being consistent with theoretical predictions related to sulfur vacancy-bound excitons in MoS2. Our results highlight cavity-enhanced extinction spectroscopy as efficient means for the detection of optical transitions in nanoscale thin films with weak absorption, applicable to a broad range of materials.
ACS Publications