Year: 2019
Type: article
Abstract: Benefiting from its unique electrical and optical properties, graphene as a saturable absorber (SA) has been widely explored. However, it is still challenging to develop SAs with large modulation depths due to the weak absorption of the monolayer graphene. Here a graphene-on-slot waveguide configuration was demonstrated to overcome this limitation. From the experimental study, with only 20 μ m long graphene, the graphene-on-silicon slot waveguide exhibited lower saturation energy of 313 pJ and seven times larger modulation depth, compared with a graphene-on-silicon nitride rib waveguide. Our study paves the way for the development of ultra-compact graphene-on-waveguide SAs for ultrafast lasers and nonlinear optics.
Source: Applied Physics Express
Language: English
Subfield: Atomic and Molecular Physics, and Optics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: bronze
OpenAlex ID: W2913339684