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Quantifying the Robustness of Topological Slow Light.
- Source :
-
Physical Review Letters . 1/15/2021, Vol. 126 Issue 2, p1-1. 1p. - Publication Year :
- 2021
-
Abstract
- The backscattering mean free path ξ, the average ballistic propagation length along a waveguide, quantifies the resistance of slow light against unwanted imperfections in the critical dimensions of the nanostructure. This figure of merit determines the crossover between acceptable slow-light transmission affected by minimal scattering losses and a strong backscattering-induced destructive interference when the waveguide length L exceeds ξ. Here, we calculate the backscattering mean free path for a topological photonic waveguide for a specific and determined amount of disorder and, equally relevant, for a fixed value of the group index ng which is the slowdown factor of the group velocity with respect to the speed of light in vacuum. These two figures of merit, ξ and ng, should be taken into account when quantifying the robustness of topological and conventional (nontopological) slow-light transport at the nanoscale. Otherwise, any claim on a better performance of topological guided light over a conventional one is not justified. [ABSTRACT FROM AUTHOR]
- Subjects :
- *GROUP velocity
*BACKSCATTERING
*VACUUM
*IMPERFECTION
Subjects
Details
- Language :
- English
- ISSN :
- 00319007
- Volume :
- 126
- Issue :
- 2
- Database :
- Academic Search Index
- Journal :
- Physical Review Letters
- Publication Type :
- Academic Journal
- Accession number :
- 148243457
- Full Text :
- https://doi.org/10.1103/PhysRevLett.126.027403