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Frozen Mode Regime in an Optical Waveguide With Distributed Bragg Reflector

Authors :
Furman, Nathaniel
Mealy, Tarek
Islam, Md Shafiqul
Vitebskiy, Ilya
Gibson, Ricky
Bedford, Robert
Boyraz, Ozdal
Capolino, Filippo
Publication Year :
2022

Abstract

We introduce a glide symmetric optical waveguide exhibiting a stationary inflection point (SIP) in the Bloch wavenumber dispersion relation. An SIP is a third order exceptional point of degeneracy (EPD) where three Bloch eigenmodes coalesce to form a so-called frozen mode with vanishing group velocity and diverging amplitude. We show that the incorporation of chirped distributed Bragg reflectors and distributed coupling between waveguides in the periodic structure facilitates the SIP formation and greatly enhances the characteristics of the frozen mode regime. We confirm the existence of an SIP in two ways: by observing the flatness of the dispersion diagram and also by using a coalescence parameter describing the separation of the three eigenvectors collapsing on each other. We find that in the absence of losses, both the quality factor and the group delay at the SIP grow with the cubic power of the cavity length. The frozen mode regime can be very attractive for light amplification and lasing, in optical delay lines, sensors, and modulators.<br />Comment: 11 pages, 14 figures

Subjects

Subjects :
Physics - Optics

Details

Database :
arXiv
Publication Type :
Report
Accession number :
edsarx.2212.06222
Document Type :
Working Paper
Full Text :
https://doi.org/10.1364/JOSAB.484490