No abstract

No abstract

Herein, an infrared (IR) photodetector has been demonstrated by depositing the (V0.99Cr0.01)2O3 films on top of a sapphire (Al2O3) wafer. The photoresponse properties, including photocurrent, voltage, responsivity, and response speed, at different temperatures and wavelengths are explored. The results showed that the deposited samples produce a significant photoresponse in the near‐IR (NIR) light. In particular, as temperature increases from 298 K (25 °C) to 453 K (180 °C), the responsivity of (V0.99Cr0.01)2O3 films improves from 7.4 to 49.4 mA W−1 under 5 V biased 940 nm laser irradiation, and it holds the quick response for about 5 s. The findings indicate that (V0.99Cr0.01)2O3 film is a promising candidate material for IR photodetector and temperature‐dependent optical delay triggers.

Realizing strong laser–matter interaction in a heterostructure consisting of two-dimensional transition metal dichalcogenides (TMDCs) and an optical nanocavity is a potential strategy for novel photonic devices. In this paper, two core-Ω shell nanostructures, Si@WS2 core-Ω shell nanostructure on glass/Si substrates, are briefly introduced. A strong laser–matter interaction occurred in the Si@WS2 core-Ω shell nanostructure when it was excited by femtosecond (fs) laser in the near-infrared-1 region (NIR-1, 650 nm–950 nm), resulting in a resonance coupling between the electric dipole resonance (EDR) of the Si nanosphere (NS) and the exciton resonance of the WS2 nanomembrane (NMB). The generation of resonance coupling regulates the resonant mode of the nanostructure to realize the multi-dimensional nonlinear optical response, which can be utilized in the fields of biological imaging and nanoscale light source.