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Metal films with arrays of subwavelength holes ͑mesh͒ exhibit extraordinary transmission resonances to which many attribute a role for surface plasmon polaritons ͑SPPs͒; others debated this point. Experimental measurements of propagation lengths are presented under conditions that pertain to the use of SPPs for surface spectroscopy. The lateral extent of electromagnetic propagation along the mesh surface is measured by recording absorption spectra of a line of latex microspheres as a functiondoi:10.1063/1.3204693 pmid:19691370 fatcat:ob5ojtqi3vabnaugudgtb7pghu