Active dielectric metasurface based on phase‐change medium
Abstract
We 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. image
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Oct 12, 2016
- Source ID
- 10.1002/lpor.201600106
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
- Yihao Chen
Organizations
- Academia Sinica
- Air Force Office of Scientific Research
- National Science and Technology Council
- University of Massachusetts