Backward Guiding of Terahertz Radiation in Periodic Dielectric Waveguides

Authors: Zhang, X.F.¹; Shen, L.F.²; Wu, J.-J.³; Yang, T.-J.³

Source: Journal of Electromagnetic Waves and Applications, Volume 24, Number 4, 2010 , pp. 557-564(8)

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Abstract:

The guiding properties of periodic dielectric waveguides (PDWGs) are investigated theoretically at terahertz frequencies for both two- and three-dimensional model systems. It is shown that in a PDWG there may exist several bound modes, and among them often occur backward modes with antiparallel phase velocity and energy flow. The backward guiding behavior of the PDWG is demonstrated by its contra-directional coupling with a conventional dielectric waveguide (CDWG). For the coupler formed by a PDWG and a CDWG, the coupling direction of energy flow is selectable, since the PDWG supports either a forward or a backward mode at different frequencies.

Document Type: Research article

DOI: http://dx.doi.org/10.1163/156939310790966222

Affiliations: 1: Department of Information Science and Electronic Engineering, Zhejiang University, Hangzhou, Zhejiang 310027, China 2: Department of Information Science and Electronic Engineering, Zhejiang University, Hangzhou, Zhejiang 310027, China;, Email: lfshen@zju.edu.cn 3: Department of Electrical Engineering, Chung Hua University, HsinChu 30012, Taiwan, R.O.C.

Publication date: 2010-03-01