Alternating Nanolayers of Dielectric MgF2and Metallic Ag as Hyperbolic Metamaterials: Probing Surface States and Optical Topological Phase Transition and Implications for Sensing Applications

Tse An Chen, Ieng Wai Un, Chih Chung Wei, Yu Jung Lu, Din Ping Tsai, Ta Jen Yen

Research output: Contribution to journalArticlepeer-review

5 Scopus citations

Abstract

Hyperbolic metamaterials (HMMs) possess marvelous electromagnetic properties, which enable a wide variety of applications, such as super-resolution and spontaneous emission. In addition, HMMs have emerged as a plasmonic biosensor platform with extreme sensitivity owing to the higher quality factors of their surface states. When predicting and analyzing these optical properties of HMMs, most of the researchers adopted the effective medium theory (EMT). However, this theory only validated for the long wavelength limit and the infinite stacking layers. To demonstrate the optical topological transition, we fabricated planar one-dimensional HMMs (1D-HMMs) that are composed of alternating MgF2/Ag nanolayers with various filling ratios and mapped the dispersion of their surface states. Strikingly, all our analytic analyses, numerical calculations, and experimental measurements indicated that the "transition point"on the dispersion curve of the surface states of 1D-HMMs did not depend on the intrinsic metal/dielectric properties but depend only on the thickness ratio of the metal nanolayers to the dielectric nanolayers. This outperformed the conventional effective medium theory. The results based on our plasmonic band theory provided a more rigorous interpretation and will benefit the sensing applications of the 1D-HMMs.

Original languageEnglish
Pages (from-to)2211-2217
Number of pages7
JournalACS Applied Nano Materials
Volume4
Issue number2
DOIs
StatePublished - 26 Feb 2021

Keywords

  • band structure theory
  • effective medium theory
  • hyperbolic metamaterial
  • optical topological transition
  • surface states

ASJC Scopus subject areas

  • Materials Science (all)

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