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- W2003251063 abstract "In this work, we demonstrate the existence of abnormal pulse propagation regimes in linear and passive multiple-beaminterferometers, where the group velocity can be tuned from subluminal to superluminal values by simply changing thelength of one of the interferometer's arms. Experiments are performed in the radiofrequency range by using coaxialtransmission lines. The interferometers group delay is characterized both in the frequency and in the time domain. Groupvelocities of 2 c and tunnelling with negative group velocity of -0.11 c were measured for electromagnetic wave packetsof 2 μs width travelling through a Mach-Zehnder interferometer. In a 4-beam interferometer, the group velocity of a 5 μswide pulse was reduced to only 0.3 c (compared to the usual value of 0.67 c ). The system is scalable to other frequencyranges and its implementation for narrowband optical pulses could be feasible by means of micromachiningtechnologies. A scaling approach for advancing/delaying optical pulses at 1.55 μm is discussed. These systems areproposed as an alternative for controlling the group velocity without the need of using photonic crystals or periodicallymicrostructuring, doping or using non-linear media." @default.
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- W2003251063 date "2010-04-30" @default.
- W2003251063 modified "2023-09-27" @default.
- W2003251063 title "Group velocity control in multiple-beam and Mach-Zehnder interferometers" @default.
- W2003251063 doi "https://doi.org/10.1117/12.853845" @default.
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