The time-bandwidth limit refers to the trade-off between the time delay that can be applied to a signal as it travels through a device and its bandwidth. Recently, there have been several studies showing that this bound can be broken in nonreciprocal nano-structures, including nonreciprocal cavities and terminated unidirectional waveguides. Here, we explore the physical mechanisms involved in these structures, and explore the opportunities offered by non-reciprocal elements to control the delay applied to an impinging signal.
Andrea Alù, Sander Mann, and Dimitrios Sounas, "Time-bandwidth limit and reciprocity in optical nanostructures (Conference Presentation)," Proc. SPIE 10719, Metamaterials, Metadevices, and Metasystems 2018, 1071909 (Presented at SPIE Nanoscience + Engineering: August 19, 2018; Published: 17 September 2018); https://doi.org/10.1117/12.2320163.5836020566001.
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