7 papers · ranked by Valyu relevance
Fabian Strauss, Zhouxiaosong Zeng, Kai Braun, Marcus Scheele
Transition metal dichalcogenides (TMDCs) exhibit favorable properties for optical communication in the GHz regime, such as large mobilities, high extinction coefficients and silicon compatibility. While impressive improvements of their sensitivity have been realized, the bandwidths of these devices have been mostly…
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We demonstrate high-speed photodetectors based on bi-, few- and multilayered WSe2 flakes fabricated by high-resolution direct laser writing of Au top contacts from atomically precise gold nanoclusters as an alternative to conventional photolithography. Time-resolved steady-state and transient photoresponse measurements…
Fabian Strauss, Pia Kohlschreiber, Jakob Keck, Patrick Michel + 3 more
We demonstrate 230 MHz photodetection and a switching energy of merely 27 fJ by using WSe2 multilayers and a very simple device architecture. This improvement over previous, slower WSe2 devices is enabled by systematically reducing the RC constant of the devices through decreasing the photoresistance as well as the…
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Pyocyanin (PYO) is a quorum-sensing signalling molecule that is secreted exclusively by Pseudomonas aeruginosa (P. aeruginosa). The monitoring of pyocyanin concentrations can therefore be used to readily detect the presence of P. aeruginosa Dissolved oxygen interference has hampered the use of materials for sensors…
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Near infrared (NIR) signals are beneficial for biomedical applications due to reduced light absorption, scattering, and autofluorescence in this range, which promises higher signal-to-noise ratios (SNR). Single-walled carbon nanotubes (SWCNTs) fluoresce in the NIR (800 nm – 1700 nm) and serve as building blocks for…
Juho Karhu, Tuomas Hieta
A real time trace gas detector for benzene is demonstrated. The measurement system takes an advantage of modest enrichment through short adsorption periods to reach a ppt-level detection limit with a sampling cycle of 90 s, which includes sample adsorption, desorption and a spectroscopic measurement. Benzene is…
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Colloidal indium antimonide (InSb) quantum dots (QDs) are highly promising nanomaterials for SWIR photodetectors due to their optical properties, solution processability, and low toxicity. Here, we present surface engineering of colloidal InSb QDs and an investigation of the intrinsic and extrinsic photoresponse time…