Photonic-integrated devices need to be spaced apart to prevent signal crosstalk, which limits their packing density. Here, Shen et al. report the use of nanophotonic cloaking to render neighbouring devices invisible to one another, which allows them to be placed closer together than is otherwise achievable.
Shen, B., Polson, R., & Menon, R. (2016). Increasing the density of passive photonic-integrated circuits via nanophotonic cloaking. Nature Communications, 7. https://doi.org/10.1038/ncomms13126