Black phosphorus is a layered semiconductor that is intensely researched in view of applications in optoelectronics. In this Letter, we investigate a multi-layer black phosphorus photo-detector that is capable of acquiring high-contrast (V>0.9) images both in the visible ({\lambda}_{VIS}=532nm) as well as in the infrared ({\lambda}_{IR}=1550nm) spectral regime. In a first step, by using photocurrent microscopy, we map the active area of the device and we characterize responsivity and gain. In a second step, by deploying the black phosphorus device as a point-like detector in a confocal microsope setup, we acquire diffraction-limited optical images with sub-micron resolution. The results demonstrate the usefulness of black phosphorus as an optoelectronic material for hyperspectral imaging applications.
@article{arxiv.1407.2534,
title = {A black phosphorus photo-detector for multispectral, high-resolution imaging},
author = {Michael Engel and Mathias Steiner and Phaedon Avouris},
journal= {arXiv preprint arXiv:1407.2534},
year = {2016}
}