Reconfigurable nonlinear losses of nanomaterial covered waveguides.

ABSTRACT: Optical waveguides covered with thin films, which transmittance can be controlled by external action, are widely used in various applications from optical modulators to saturable absorbers. It is natural to suggest that the losses through such a waveguide will be proportional to the absorption coefficient of the covering material. In this letter, we demonstrate that under certain conditions, this simple assumption fails. Instead, we observe that the reduction of the material loss of the film can lead to an increase in the propagation losses through the waveguide. For this, we use a side polished fiber covered with a single-walled carbon nanotube thin film whose absorption can be attenuated either by a short pulse illumination (due to absorption saturation) or with electrochemical gating. F

SUBMITTER: Davletkhanov A 

PROVIDER: S-EPMC11501370 | biostudies-literature | 2023 Nov

REPOSITORIES: biostudies-literature