Investigation of fast light in three-layer waveguides composed of negative-refraction claddings and an air core. (20th September 2019)

• Record Type: Journal Article
• Authors: Zhao, Zeyang; Pan, Guangwu; Qiu, Weibin; Wang, Zeyu; Ren, Junbo; Zhou, Hengjie; Qiu, Pingping; Kan, Qiang
• Is Part Of: Journal of physics. Volume 52:Number 49(2019)
• Publication Date: 2019-09-20
• Subjects: air core -- fast light -- negative index -- photonic crystal; Physics -- Periodicals; 530
• DOI: 10.1088/1361-6463/ab3f6c
• Languages: English
• ISSNs: 0022-3727

Abstract

Abstract: 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.