Abstract
AbstractAs silicon has a large refractive index and low loss in infrared wavelengths, it becomes an important optical material that has been widely used for integrated photonics applications. In this paper, we present some of our recent experimental works on infrared two‐dimensional air‐bridged silicon photonic crystal (PhC) slab devices that are based on both the band gap and band structure engineering. We have designed, fabricated, and characterized a series of PhC waveguides with novel geometries, resonant microcavities with fine tunability, and channel drop filters utilizing resonant coupling between waveguide and cavity. These devices are aimed to construct a more flexible network of transport channels for infrared light at micrometer/nanometer scale. We have also explored the remarkable dispersion properties of PhCs by engineering the band structures to achieve negative refraction, self‐collimation, superprism, and other anomalous dispersion behaviors of infrared light beams. We have designed and fabricated a PhC structure with negative refraction effect and used scanning near‐field optical microscopy to observe the negative refraction beam.
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