Active Dielectric Metasurface Based on Phase-Change Medium

Abstract

We propose all-dielectric meta surfaces that can be actively re-configured using the phase-change material Ge2Sb2Te5 (GST) alloy. With selectively controlled phase transitions on the composing GST elements, meta surfaces can be tailored to exhibit varied functionalities. Using phase-change GST rod as the basic building block, we have modelled meta molecules with tunable optical response when phase change occurs on select constituent GST rods. Tunable gradient meta surface scan 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 function scan 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.

Open PDF

Document Details

Document Type
Technical Report
Publication Date
Oct 13, 2016
Accession Number
AD1051791

Entities

People

  • Cheng Hung Chu
  • Din Ping Tsai
  • Greg Sun
  • Hsiang-chu Wang
  • Hui Jun Wu
  • Jie Chen
  • Ming Lun Tseng
  • Pin Chieh Wu
  • Ting-yu Chen
  • Wen Ting Hsieh
  • Yi-hao Chen

Tags

DTIC Thesaurus Topics

  • Electric Fields
  • Electromagnetic Fields
  • Films
  • Geometry
  • Magnetic Fields
  • Materials
  • Materials Science
  • Metamaterials
  • Near Field
  • Optical Properties
  • Phase Change Materials
  • Phase Modulation
  • Phase Transformations
  • Refractive Index
  • Thin Films
  • Three Dimensional
  • Two Dimensional

Readers

  • Marine Propulsion Engineering and Naval Architecture
  • Nanofabrication and Microfabrication.
  • Nanoscale Plasmonic Nanotechnology

Technology Areas

  • Space