| http://www.w3.org/ns/prov#value | - Slow, fast, and negative group velocities were observed in a 7 cm long chalcogenide (As2S3) rib waveguide with a group index change ranging from ??????44 to +130, which results in a maximum delay of ???23???ns at a relatively low gain of ???23???dB. Demonstration of large tunable delays in a chip scale device opens up applications such as frequency sensing and true-time delay for a phased array an
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