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Using graphene, researchers have found a way to confine light down to a space that is one atom thick. The ability to confine light to such a small space could pave the way for ultrasmall optoelectronic devices.
Previous work has shown that while metals can compress light below the diffraction limit, this additional confinement typically comes at the cost of additional energy loss. A team from the Institute of Photonic Sciences (ICFO), the University of Minho in Portugal, and Massachusetts Institute of Technology has addressed this issue by building a graphene-insulator-metal heterostructure that can overcome the trade-off between confinement and losses.
