Investigation of fast light in three-layer waveguides composed of negative-refraction claddings and an air core

An optical medium with abnormal dispersion supports fast light, which possesses a group velocity faster than the speed of light in a vacuum or even takes on a negative value (a backward wave), and shows exceptional promise for optoelectronic applications. In this article, three-layer dielectric wave...

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Bibliographic Details
Published inJournal of physics. D, Applied physics Vol. 52; no. 49; pp. 495105 - 495112
Main Authors Zhao, Zeyang, Pan, Guangwu, Qiu, Weibin, Wang, Zeyu, Ren, Junbo, Zhou, Hengjie, Qiu, Pingping, Kan, Qiang
Format Journal Article
LanguageEnglish
Published IOP Publishing 04.12.2019
Subjects
air core
fast light
negative index
photonic crystal
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Summary:An optical medium with abnormal dispersion supports fast light, which possesses a group velocity faster than the speed of light in a vacuum or even takes on a negative value (a backward wave), and shows exceptional promise for optoelectronic applications. In this article, three-layer dielectric waveguides composed of negative refraction cladding, which is made up of silicon crystal, and an air core are constructed, where the so-called fast light can propagate a backward wave by modifying the thickness of the air core. The dispersion properties of the fast light are investigated analytically. Finally, numerical results are derived by using the finite-element method to verify the analytical results. The proposed structure might find applications in the field of photonic integrated circuits.
Bibliography:JPhysD-121004.R1
ISSN:0022-3727
1361-6463
DOI:10.1088/1361-6463/ab3f6c