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Autori: A. I. Cabuz, E. Centeno, and D. Cassagne
Editorial: Applied Physics Letters, 84, p.2031-2033, 2004.
In this letter, we show that photonic crystals with geometries of lower symmetry, such as the
rectangular geometry, are uniquely suited for applications involving the superprism effect. The extra
degree of freedom provided by the anisotropy of the unit cell allows more freedom in searching for
suitable iso-frequency curves. Also, the appearance of multiple orders of diffraction allows more
than one incident plane wave to couple to the same Bloch mode. This extra degree of freedom is
decisive when trying to optimize the transmission. We illustrate these ideas on a particular
rectangular configuration which ensures a strong angular superprism effect, a well collimated
transmitted beam, and power transmissions of up to 80%.
Cuvinte cheie: photonic crystals, super-prism, ultrarefraction, isofrequency curves, rectangular