Highly efficient and environmentally stable black‐phosphorus‐based ultrafast optical switches have been demonstrated by Meng Zhang, Han Zhang and co‐workers in article number 1800224 by using light‐induced deposition or inkjet‐printing techniques. The demonstrated optical devices are capable to generate ultrashort wavelength‐tunable pulses covering the spectral region from near‐ to mid‐infrared, providing new potential efficacy for ultrafast laser technology.
