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Active dielectric metasurface based on phase‐change medium
Author(s) -
Chu Cheng Hung,
Tseng Ming Lun,
Chen Jie,
Wu Pin Chieh,
Chen YiHao,
Wang HsiangChu,
Chen TingYu,
Hsieh Wen Ting,
Wu Hui Jun,
Sun Greg,
Tsai Din Ping
Publication year - 2016
Publication title -
laser and photonics reviews
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.778
H-Index - 116
eISSN - 1863-8899
pISSN - 1863-8880
DOI - 10.1002/lpor.201600106
Subject(s) - dielectric , rod , materials science , phase (matter) , amorphous solid , optics , optoelectronics , coupling (piping) , supercell , refractive index , physics , computer science , chemistry , telecommunications , medicine , radar , alternative medicine , organic chemistry , pathology , quantum mechanics , metallurgy
We propose all‐dielectric metasurfaces that can be actively re‐configured using the phase‐change material Ge 2 Sb 2 Te 5 (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.