Ultracompact optical buffers on a silicon chip

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Silicon-on-Insulator Spectral Filters Fabricated With CMOS Technology (2010, background): “To obtain the desired functionality, the coupling and round-trip length need to be controlled well, especially when constructing higher order filters based on multiple rings in series or in parallel [40], [41].”
Unidirectional reflectionless light propagation at exceptional points (2017, background): “It should be noted that the proposed non-PT-symmetric waveguide-cavity system can also be realized using other nanophotonic structures such as microring and PhC cavities [131, 132].”
Robust optical delay lines with topological protection (2011, result): “In particular, in comparison to state-of-the-art 1D CROW system”
Ultrahigh-Bandwidth Silicon Photonic Nanowire Waveguides for On-Chip Networks (2008, background): “Complex active and passive components have been envisioned and successfully fabricated in this material system [3]–[5].”
Photon confinement in photonic crystal nanocavities (2008, background): “coupling between quantum dot and cavity modes [8, 9], light storing [10], wavelength routing [11] and buffering [12], optical bistability [13], high-speed modulation in silicon [14, 15], lasing at ultralow thresholds [16–19] and single-molecule sensing [20].”