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Proceedings Paper

Low-loss multimode interference couplers for terahertz waves
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Paper Abstract

The terahertz (THz) frequency region of the electromagnetic spectrum is located between the traditional microwave spectrum and the optical frequencies, and offers a significant scientific and technological potential in many fields, such as in sensing, in imaging and in spectroscopy. Waveguiding in this intermediate spectral region is a major challenge. Amongst the various THz waveguides suggested, metal-clad plasmonic waveguides and specifically hollow core structures, coated with insulating material are the most promising low-loss waveguides used in both active and passive devices. Optical power splitters are important components in the design of optoelectronic systems and optical communication networks such as Mach-Zehnder Interferometric switches, polarization splitter and polarization scramblers. Several designs for the implementation of the 3dB power splitters have been proposed in the past, such as the directional coupler-based approach, the Y-junction-based devices and the MMI-based approach. In the present paper a novel MMI-based 3dB THz wave splitter is implemented using Gold/polystyrene (PS) coated hollow glass rectangular waveguides. The H-field FEM based full-vector formulation is used here to calculate the complex propagation characteristics of the waveguide structure and the finite element beam propagation method (FE-BPM) and finite difference time domain (FDTD) approach to demonstrate the performance of the proposed 3dB splitter.

Paper Details

Date Published: 26 April 2012
PDF: 6 pages
Proc. SPIE 8426, Microstructured and Specialty Optical Fibres, 84260X (26 April 2012); doi: 10.1117/12.925655
Show Author Affiliations
Christos Themistos, Frederick Univ. (Cyprus)
Kyriacos Kalli, Cyprus Univ. of Technology (Cyprus)
Michael Komodromos, Frederick Univ. (Cyprus)
Christos Markides, Frederick Univ. (Cyprus)
Anita Quadir, City Univ. London (United Kingdom)
B. M. Azizur Rahman, City Univ. London (United Kingdom)
Kenneth T. V. Grattan, City Univ. London (United Kingdom)


Published in SPIE Proceedings Vol. 8426:
Microstructured and Specialty Optical Fibres
Kyriacos Kalli; Alexis Mendez, Editor(s)

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