The resonant nature of metamaterials is very sensitive to the presence of dissipative losses in the constituting metals. The losses are particularly strong in the optical regime hampering the use of metamaterials for photonic applications. Therefore switching to monocrystals of noble metals alone should provide a substantial mileage in reducing losses.
Our crystal growth technique is based on epitaxial deposition, where metal vapor condenses on a crystalline substrate to a film with crystalline orientations closely related to that of the substrate.
We have revisited the epitaxial growth techniques and found a combination of a substrate and deposition conditions that substantially simplified the procedure of growing plasmonic mono crystals.
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T. Koiwa, V. A. Fedotov, J. Y. Ou, and T. Uchino
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