Procedure for fabricating vertically oriented angstrom gaps for optical purposes, using graphene as spacer. From left to right: photolithography, single-layer graphene growth, metal deposition and peeling off. Selected for an Editors’ Suggestion.

From the article:

Electromagnetic Saturation of Angstrom-Sized Quantum Barriers at Terahertz Frequencies
Young-Mi Bahk, Bong Joo Kang, Yong Seung Kim, Joon-Yeon Kim, Won Tae Kim, Tae Yun Kim, Taehee Kang, Jiyeah Rhie, Sanghoon Han, Cheol-Hwan Park, Fabian Rotermund, and Dai-Sik Kim
Phys. Rev. Lett. 115, 125501 (2015)

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