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Properties of TM resonances on metallic slit gratings |
Applied Optics, Vol. 51, Issue 11, pp. 1729-1741 (2012)
http://dx.doi.org/10.1364/AO.51.001729
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Abstract
Electromagnetic resonances on metallic slit gratings induced by TM polarized incident light have been investigated and physically interpreted. We have developed an electromagnetic model imposing surface impedance boundary conditions on the metallic grating surface from which we derive simple formulas explaining all physical properties of these resonances. It is demonstrated that Fabry–Perot (or cavity) resonances are generated by the zeroth slit mode yielding extraordinary transmission. For very narrow slits, the resonant H-field is squeezed to the slit walls and causes enhanced power losses. The excitation of surface plasmon polaritons (SPPs), however, is generated by two mode coupling. SPPs are linked to sharp absorption peaks and dips in transmittance. It is shown that these phenomena are primarily caused by the interaction of the electromagnetic fields with the finite conducting slit walls. These findings have been confirmed by measured transmittance data of gold gratings with periods of 0.5 μm, 1 μm, and 2 μm.
© 2012 Optical Society of America
OCIS Codes
(240.6690) Optics at surfaces : Surface waves
(050.5745) Diffraction and gratings : Resonance domain
(050.6624) Diffraction and gratings : Subwavelength structures
ToC Category:
Diffraction and Gratings
History
Original Manuscript: October 27, 2011
Revised Manuscript: December 16, 2011
Manuscript Accepted: December 16, 2011
Published: April 5, 2012
Citation
Hans Lochbihler and Ricardo A. Depine, "Properties of TM resonances on metallic slit gratings," Appl. Opt. 51, 1729-1741 (2012)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-51-11-1729
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