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Updated: Jul 9, 2026

Terahertz Microfluidic Sensing Using a Parallel-plate Waveguide Sensor
Published on: August 30, 2012
Simple approach to coupling in textured planar waveguides
1Advanced Materials and Process Engineering Laboratory, Department of Physics and Astronomy, 2355 East Mall, University of British Columbia, Vancouver, British Columbia V6T 1Z4, Canada.
Abstract:
We develop a self-consistent Green's function technique to calculate the full photonic band structure for guided modes in slab waveguides that have been textured in one dimension with a thin surface grating. The technique is conceptually simple and can easily be reduced to an eigenvalue problem by use of approximations similar to those used in conventional coupled-mode theories. We show that this approach yields the correct TM-TM coupling coefficient at oblique incidence and provides a transparent interpretation for its vanishing at a critical angle.
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