Crossed chiral band approximation for wide-band self-collimation of light

Date
2020
Editor(s)
Advisor
Supervisor
Co-Advisor
Co-Supervisor
Instructor
Source Title
Journal of Physics D: Applied Physics
Print ISSN
0022-3727
Electronic ISSN
Publisher
Institute of Physics Publishing
Volume
53
Issue
23
Pages
Language
English
Journal Title
Journal ISSN
Volume Title
Series
Abstract

We propose a perspective to the evaluation of the wide bandwidth phenomenon for low-symmetric photonic structures, by introducing the band tailoring and chiral band approximation on the self-collimation effect. In the case of the crossing of the bands, we claim the excitation of the lower mode can provide the utilization of the entire bandwidth by suppressing the intersection regions where the frequencies tend to mix. Thereby, we design broadband self-collimation capable, defect-free photonic structures and examine their performances. A fractional bandwidth of 0.35 (a/λ = 0.429 − 0.607) and 0.37 (a/λ = 0.481 − 0.701) are achieved for radii of r = 0.25a and r = 0.23a, respectively. We explore the full-range collimation by using transmission and E-field intensity analyses in addition to band diagrams and group velocity dispersions. Moreover, we indicate all-angle collimation validity even for highly tilted sources up to an angle of 80◦ .

Course
Other identifiers
Book Title
Citation
Published Version (Please cite this version)