Electromagnetic transmission resonances for a single annular aperture in a metal plate

Journal Article · Fri Oct 15 00:00:00 EDT 2010 · Physical Review. A

DOI:https://doi.org/10.1103/PHYSREVA.82.041801· OSTI ID:21454803

Li, Dan; Gordon, Reuven ^[1]

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1. Department of Electrical and Computer Engineering, University of Victoria, 3800 Finnerty Road, British Columbia, V8P 5C2 (Canada)

We present a theory for the reflection phase and amplitude of the lowest-order TEM mode in an annular aperture at the end of a metal plate. This reflection coefficient determines the frequency and peak width of the Fabry-Perot transmission resonances. The theory assumes that the width of the aperture is subwavelength; however, the annular radius can be quite large, and we show that the theory reproduces the reflection of a linear slit in the limit of infinite radius. Finite-difference time-domain calculations agree well with the theory, in terms of both the transmission resonance frequency values and the extracted reflectivity. The theory presented shows that both the phase and amplitude of reflection can vary substantially with changes in geometry and frequency, and that both are modulated by transverse resonances. This work has implications for filters, near-field aperture probes, sensors, and metamaterials.

• OSTI ID: 21454803
• Journal Information: Physical Review. A, Vol. 82, Issue 4; Other Information: DOI: 10.1103/PhysRevA.82.041801; (c) 2010 The American Physical Society; ISSN 1050-2947
• Country of Publication: United States
• Language: English

Related Subjects

74 ATOMIC AND MOLECULAR PHYSICS
AMPLITUDES
APERTURES
ELECTROMAGNETIC RADIATION
FINITE DIFFERENCE METHOD
LINE WIDTHS
METALS
PLATES
REFLECTION
REFLECTIVITY
RESONANCE
TRANSMISSION
CALCULATION METHODS
ELEMENTS
ITERATIVE METHODS
MATHEMATICAL SOLUTIONS
NUMERICAL SOLUTION
OPENINGS
OPTICAL PROPERTIES
PHYSICAL PROPERTIES
RADIATIONS
SURFACE PROPERTIES