Black phosphorus a new saturable absorber material for ultrashort pulse generation

TL;DR

Black phosphorus can serve as an effective broadband saturable absorber for ultrashort pulse generation, demonstrating the ability to produce sub-picosecond pulses at multiple wavelengths, highlighting its potential in ultrafast optics.

Contribution

This paper demonstrates for the first time that black phosphorus can be used as a broadband saturable absorber for ultrashort pulse generation.

Findings

Black phosphorus exhibits a 4.4% transmission increase under pulsed excitation at 1560 nm.

It can generate 272 fs pulses at 1550 nm.

It can generate 739 fs pulses at 1910 nm.

Abstract

Low-dimensional materials, due to their versatile properties are very interesting for numerous electronics and optoelectronics applications. Recently rediscovered black phosphorus, with a graphite-like structure can be exfoliated up to the single atomic layer. In contrary to graphene it possesses a direct band gap controllable by the number of stacked atomic layers. For those reasons, it is now intensively investigated. Here we demonstrate, that black phosphorus can serve as a broadband saturable absorber and can be used for ultrashort optical pulse generation. The mechanically exfoliated ~300 nm thick layers of black phosphorus were transferred onto the fiber core and under pulsed excitation at 1560 nm wavelength its transmission increases by 4.4%. It was used to generate 272 fs-short pulses at 1550 nm and 739 fs at 1910 nm. The obtained results shows that black phosphorus can be effectively used for ultrashort pulse generation and proves its great potential to future applications.