Frozen Mode in an Asymmetric Serpentine Optical Waveguide
Abstract
The existence of a frozen mode in a periodic serpentine waveguide with broken longitudinal symmetry is demonstrated numerically. The frozen mode is associated with a stationary inflection point (SIP) of the Bloch dispersion relation, where three Bloch eigenmodes collapse on each other, as it is an exceptional point of order three. The frozen mode regime is characterized by vanishing group velocity and enhanced field amplitude, which can be very attractive in various applications including dispersion engineering, lasers, and delay lines. Useful and simple design equations that lead to realization of the frozen mode by adjusting a few parameters are derived. The trend in group delay and quality factor with waveguide length that is peculiar of the frozen mode is shown. The symmetry conditions for the existence of exceptional points of degeneracy associated with the frozen mode are also discussed.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- May 10, 2022
- Source ID
- 10.1002/adpr.202100377
Entities
People
- Albert HerreroâParareda
- Filippo Capolino
- Ilya Vitebskiy
- Jacob Scheuer
Organizations
- Air Force Office of Scientific Research
- Air Force Research Laboratory
- Tel Aviv University
- University of California, Irvine