Intrinsic Optical Properties and Enhanced Plasmonic Response of Epitaxial Silver
Yanwen Wu(University of South Carolina), Chengdong Zhang(The University of Texas at Austin), Nasim Mohammadi Estakhri(The University of Texas at Austin), Yang Zhao(The University of Texas at Austin), Jisun Kim(The University of Texas at Austin), Matt Zhang(The University of Texas at Austin), Xing‐Xiang Liu(The University of Texas at Austin), Greg K. Pribil(J.A. Woollam Company (United States)), Andrea Alù(The University of Texas at Austin), Chih‐Kang Shih(The University of Texas at Austin), Xiaoqin Li(The University of Texas at Austin)
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Abstract
Using atomically smooth epitaxial silver films, new optical permittivity highlighting significant loss reduction in the visible frequency range is extracted. Largely enhanced propagation distances of surface plasmon polaritons are measured, confirming the low intrinsic loss in silver. The new permittivity is free of extrinsic spectral features associated with grain boundaries and localized plasmons inevitably present in thermally deposited films.
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