All Title Author
Keywords Abstract

Physics  2011 

On the attenuation coefficient of monomode periodic waveguides

DOI: 10.1103/PhysRevLett.107.153901

Full-Text   Cite this paper   Add to My Lib


It is widely accepted that, on ensemble average, the transmission T of guided modes decays exponentially with the waveguide length L due to small imperfections, leading to the important figure of merit defined as the attenuation-rate coefficient alpha = -/L. In this letter, we evidence that the exponential-damping law is not valid in general for periodic monomode waveguides, especially as the group velocity decreases. This result that contradicts common beliefs and experimental practices aiming at measuring alpha is supported by a theoretical study of light transport in the limit of very small imperfections, and by numerical results obtained for two waveguide geometries that offer contrasted damping behaviours.


comments powered by Disqus

Contact Us


微信:OALib Journal