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

2019-10-11

Authors: Zhao, ZY; Pan, GW; Qiu, WB; Wang, ZY; Ren, JB; Zhou, HJ; Qiu, PP; Kan, Q

JOURNAL OF PHYSICS D-APPLIED PHYSICS

Volume: 52 Issue: 49 Published: SEP 20 2019 Language: English Document type: Article

DOI: 10.1088/1361-6463/ab3f6c

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 tip 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.

Full Text: https://iopscience.iop.org/article/10.1088/1361-6463/ab3f6c



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