Artículo
Properties of TM resonances on metallic slit gratings
Fecha de publicación:
04/2012
Editorial:
OSA - The Optical Society
Revista:
Applied Optics
ISSN:
1539-4522
Idioma:
Inglés
Tipo de recurso:
Artículo publicado
Clasificación temática:
Resumen
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.
Palabras clave:
Surface Waves
,
Diffraction And Gratings
,
Subwavelength Structures
Archivos asociados
Licencia
Identificadores
Colecciones
Articulos(IFIBA)
Articulos de INST.DE FISICA DE BUENOS AIRES
Articulos de INST.DE FISICA DE BUENOS AIRES
Citación
Lochbihler, Hans; Depine, Ricardo Angel; Properties of TM resonances on metallic slit gratings; OSA - The Optical Society; Applied Optics; 51; 11; 4-2012; 1729-1741
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