| 摘要 |
A grating structure for channeling and concentrating incident radiation includes a regular pattern of elements each with a metallic shell partially surrounding at least one subcavity. The subcavity is filled with a dielectric or semiconductor. Light of one or more predetermined wavelength ranges can be concentrated in the subcavity(s) and then efficiently channeled through the grooves between adjacent elements. An optoelectronic device includes the structure superposed on a substrate, which can be semiconductive, and the elements of the grating used as electrodes and adapted to allow a potential difference between adjacent (electrode) elements. The optoelectronic devices include photodetectors, e.g., metal-semiconductor-metal, pn, pin, avalanche, LEDs, IR emitting devices, and biological or chemical sensors.
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