Guided resonance in negative index photonic crystals: a new approach

Light incident on a photonic crystal slab can be negatively refracted and thus travel backwards along the slab. This is the finding of Vito Mocella and co-workers from the Institute of Microelectronics and Microsystems in Naples, Italy, and Lawrence Berkeley National Laboratory in the United States. The researchers studied guided resonance in a 1×1 mm2 silicon-on-insulator slab featuring an array of etched air holes arranged in a hexagonal pattern. Illuminating the slab with near-infrared light at a suitable angle from above caused the excitation of guided modes that propagated backwards along the structure and were then captured by an infrared camera. This surprising behaviour, which the researchers also modelled theoretically, is attributed to the negative index of the photonic crystal.

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