title: Black phosphorus photodetector for multispectral, high-resolution imaging.
abstract: Black phosphorus is a layered semiconductor that is intensely researched in view of applications in optoelectronics. In this letter, we investigate a multilayer black phosphorus photodetector that is capable of acquiring high-contrast (V > 0.9) images both in the visible (λVIS = 532 nm) as well as in the infrared (λIR = 1550 nm) 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 submicron resolution. The results demonstrate the usefulness of black phosphorus as an optoelectronic material for hyperspectral imaging applications.
authors.affiliation: IBM Thomas J. Watson Research Center , Yorktown Heights, New York 10598, United States.
authors.forename: Michael
authors.initials: M
authors.lastname: Engel
authors.forename: Mathias
authors.initials: M
authors.lastname: Steiner
authors.forename: Phaedon
authors.initials: P
authors.lastname: Avouris
keywords: Black phosphorus; imaging; near-infrared; optoelectronics; photodetector