Active dielectric metasurface based on phase-change medium

C.H. Chu, M.L. Tseng, J. Chen, P.C. Wu, Y.-H. Chen, H.-C. Wang, T.-Y. Chen, W.T. Hsieh, H.J. Wu, G. Sun, Din-ping Tsai

Research output: Journal article publicationJournal articleAcademic researchpeer-review

188 Citations (Scopus)

Abstract

© 2016 by WILEY-VCH Verlag GmbH & Co. KGaA, WeinheimWe propose all-dielectric metasurfaces that can be actively re-configured using the phase-change material Ge2Sb2Te5 (GST) alloy. With selectively controlled phase transitions on the composing GST elements, metasurfaces can be tailored to exhibit varied functionalities. Using phase-change GST rod as the basic building block, we have modelled metamolecules with tunable optical response when phase change occurs on select constituent GST rods. Tunable gradient metasurfaces can be realized with variable supercell period consisting of different patterns of the GST rods in their amorphous and crystalline states. Simulation results indicate a range of functions can be delivered, including multilevel signal modulating, near-field coupling of GST rods, and anomalous reflection angle controlling. This work opens up a new space in exploring active meta-devices with broader applications that cannot be achieved in their passive counterparts with permanent properties once fabricated. (Figure presented.).
Original languageEnglish
Pages (from-to)986-994
Number of pages9
JournalLaser and Photonics Reviews
Volume10
Issue number6
DOIs
Publication statusPublished - 1 Nov 2016
Externally publishedYes

Keywords

  • beam steering
  • Fano resonances
  • metamaterials
  • phase-change material
  • reconfigurable metasurface

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics
  • Condensed Matter Physics

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