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Title: Crossed chiral band approximation for wide-band self-collimation of light
Authors: Gümüş, Melike A.
Akcaalan, Önder
Kurt, Hamza
Keywords: Self-collimation
Issue Date: Apr-2020
Publisher: Institute of Physics Publishing
Source: Gumus, M. A., Akcaalan, O. And Kurt, H. (2020). Crossed chiral band approximation for wide-band self-collimation of light. Journal of Physics D: Applied Physics, 53(23), 23LT03.
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/lambda=0.429-0.607<i) and 0.37 ( a/lambda=0.481-0.701<i) are achieved for radii of r=0.25ar=0.23a<i, 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 degrees.
ISSN: 0022-3727
Appears in Collections:Elektrik ve Elektronik Mühendisliği Bölümü / Department of Electrical & Electronics Engineering
Scopus İndeksli Yayınlar Koleksiyonu / Scopus Indexed Publications Collection
WoS İndeksli Yayınlar Koleksiyonu / WoS Indexed Publications Collection

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