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Despite the great amount of papers on the photon– SPP (surface plasmon polariton) transformations in periodical structures that appeared over the past decades (it is sufficient to mention [1–3]), the exper-iment concerning transparency of metal films [4] which is caused by the effect was realized only recently. Since this first observation of the extraordi-nary optical transmission through subwavelength hole arrays, many theoreticians have contributed to explaining the effect [5–11]. But still the qualitative analytical picture of the light tunneling phenomenon is not sufficiently covered. The majority of the expla-nations are based upon numerical calculations (to the best of the author’s knowledge, the only exceptions are [5, 9], but paper [5] contains only crude quantita