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Atomic, Molecular and Optical Physics | Physics
1.3 PHYSICAL SCIENCES; Optics
Tunable on-chip optical delay has long been a key target for the research community, as it is the enabling technology behind delay lines, signal re-timing and other applications vital to optical signal processing. To date the field has been limited by high optical losses associated with slow light or delay structures. Here, we present a novel tunable delay line, based on a coupled cavity system exhibiting an Electromagnetically Induced Transparency-like transmission spectrum, with record low loss, around 15dB/ns. By tuning a single cavity the delay of the complete structure can be tuned over 120ps, with the maximum delay approaching 300ps.
Hu, C. et al., 2018. Tunable Optical Buffer through an Analogue to Electromagnetically Induced Transparency in Coupled Photonic Crystal Cavities. ACS Photonics, 5(5), pp.1827–1832. Available at: http://dx.doi.org/10.1021/acsphotonics.7b01590.