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Electrically reconfigurable non-volatile metasurface using low-loss optical phase-change material.
Yifei Zhang1, Clayton Fowler2, Junhao Liang1
1Department of Materials Science and Engineering, Massachusetts Institute of Technology, Cambridge, MA, USA.
Nature Nanotechnology
|April 20, 2021
Summary
This study introduces a new platform for active metasurfaces using optical phase-change materials (PCMs). These reconfigurable devices offer enhanced optical properties and enable dynamic beam steering applications.
Area of Science:
- Optics and Photonics
- Materials Science
- Nanotechnology
Background:
- Active metasurfaces offer advantages over traditional optics in terms of size, durability, and performance.
- Optical phase-change materials (PCMs) are promising for active metasurfaces due to their significant refractive index contrast and non-volatile switching.
Purpose of the Study:
- To develop a large-scale, electrically reconfigurable, non-volatile metasurface platform utilizing optical PCMs.
- To leverage the unique properties of Ge2Sb2Se4Te (GSST) for enhanced light-matter interactions and optical functionalities.
Main Methods:
- Fabrication of a metasurface platform using the optical phase-change material Ge2Sb2Se4Te (GSST).
- Electrical reconfiguration of the metasurface properties.
- Characterization of spectral tuning range and optical contrast.
Main Results:
- Demonstration of quasi-continuously tunable active metasurfaces with a record half-octave spectral tuning range.
- Achieved large optical contrast exceeding 400%.
- Prototyped a polarization-insensitive phase-gradient metasurface for dynamic optical beam steering.
Conclusions:
- The developed GSST-based metasurface platform enables significant advancements in reconfigurable optics.
- The platform facilitates enhanced light-matter interactions and opens possibilities for novel optical devices like dynamic beam steering systems.
