A Nonvolatile Phase‐Change Metamaterial Color Display
Abstract
Chalcogenide phase‐change materials, which exhibit a marked difference in their electrical and optical properties when in their amorphous and crystalline phases and can be switched between these phases quickly and repeatedly, are traditionally exploited to deliver nonvolatile data storage in the form of rewritable optical disks and electrical phase‐change memories. However, exciting new potential applications are now emerging in areas such as integrated phase‐change photonics, phase‐change optical metamaterials/metasurfaces, and optoelectronic displays. Here, ideas from these last two fields are fused together to deliver a novel concept, namely a switchable phase‐change metamaterial/metasurface resonant absorber having nonvolatile color generating capabilities. With the phase‐change layer, here GeTe, in the crystalline phase, the resonant absorber can be tuned to selectively absorb the red, green, and blue spectral bands of the visible spectrum, so generating vivid cyan, magenta, and yellow pixels. When the phase‐change layer is switched into the amorphous phase, the resonant absorption is suppressed and a flat, pseudowhite reflectance results. Thus, a route to the potential development is opened‐up of nonvolatile, phase‐change metamaterial color displays and color electronic signage.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Jul 09, 2019
- Source ID
- 10.1002/adom.201801782
Entities
People
- C D Wright
- Carlos Ríos
- Gerardo Rodriguez‐hernandez
- Harish Bhaskaran
- Liam Trimby
- Peiman Hosseini
- Santiago García‐cuevas Carrillo
- V. Karthik Nagareddy
- Yat‐yin Au
Organizations
- Engineering and Physical Sciences Research Council
- Office of Naval Research Global
- University of Exeter
- University of Oxford