Abstract
Monolayer of transition metal dichalcogenides (TMDs), with lamellar structure as that of graphene, has attracted significant attentions in optoelectronics and photonics. Here, we focus on the optical absorption response of a new member TMDs, rhenium disulphide (ReS2) whose monolayer and bulk forms have the nearly identical band structures. The nonlinear saturable and polarization-induced absorption of ReS2 are investigated at near-infrared communication band beyond its bandgap. It is found that the ReS2-covered D-shaped fiber (RDF) displays the remarkable polarization-induced absorption, which indicates the different responses for transverse electric (TE) and transverse magnetic (TM) polarizations relative to ReS2 plane. Nonlinear saturable absorption of RDF exhibits the similar saturable fluence of several tens of μJ/cm2 and modulation depth of about 1% for ultrafast pulses with two orthogonal polarizations. RDF is utilized as a saturable absorber to achieve self-started mode-locking operation in an Er-doped fiber laser. The results broaden the operation wavelength of ReS2 from visible light to around 1550 nm, and numerous applications may benefit from the anisotropic and nonlinear absorption characteristics of ReS2, such as in-line optical polarizers, high-power pulsed lasers, and optical communication system.
Highlights
The booming exploration of nanomaterials, especially the two-dimensional (2D) materials, helps the promotion of the investigation and application in optoelectronics and photonics[1,2,3,4]
We study a new member of the transition metal dichalcogenides (TMDs) family, rhenium disulphide (ReS2), whose layered material possesses strong in-plane anisotropic, but exhibits much better environmental stability than BP29,34
ReS2 is produced via chemical vapor deposition (CVD) grown on sapphire substrate, which is cut into strip samples with the width of ~1 mm and the length of ~5 mm
Summary
The booming exploration of nanomaterials, especially the two-dimensional (2D) materials, helps the promotion of the investigation and application in optoelectronics and photonics[1,2,3,4]. The nonlinear saturable and polarization-induced absorptions of ReS2 are demonstrated at infrared communication wavelength in our work. The ReS2-covered D-shaped fiber (RDF) displays the remarkable polarization-induced absorption, while the nonlinear saturable absorption possesses the features that are independent of polarization.
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