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Hamamatsu Corp. - Earth Innovations LB 2/24

Crystal Waveguides Form Optical Delay Lines

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Femtosecond Technology Research Association scientists in Tsukuba, Japan, have constructed coupled-cavity waveguides by forming cylindrical airholes in ridge waveguides using electron-beam lithography and reactive ion-beam etching. The group had previously suggested that coupled-cavity waveguides could enable the efficient optical delay of ultrashort photonic pulses. The researchers generated periodically spaced defects in the silicon on silicon-dioxide ridge waveguides by increasing the distance between the airholes. With the proper lattice constant, they produced quasiflat impurity bands...Read full article

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    Published: October 2002
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