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Channel-dropping filters with photonic crystal slabs connected between channel waveguides were fabricated and demonstrated. They attained highly efficient flat-top drop-out spectrum at a wavelength of 1.56 mum and a drop bandwidth of 5.8 nm
Si photonic wire waveguides are attractive for constructing various optical devices that are extremely small because the waveguides can be bent with extremely small curvatures of less than a few micrometers of bending radius. We have fabricated optical directional couplers with the waveguides and demonstrated their fundamental characteristics. Their coupling length was extremely short, several micrometers,...
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