期刊
NANO LETTERS
卷 16, 期 2, 页码 1050-1055出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.5b04122
关键词
Metasurfaces; metamaterials; meta-devices; defect engineering; phase-transition materials
类别
资金
- Helmholtz Virtual Institute [VH-VI-422 MEMRIOX]
- DAAD program [57051746]
- ARO [W911NF-14-1-0669]
- AFOSR [FA9550-12-0189]
- Draper Laboratory [SC001-0000000731]
- Singapore A*STAR National Science Graduate Scholarship
- Moore Foundation Investigator in quantum materials [GBMF4533]
- Initiative and Networking Fund of German Helmholtz Association
- [ARO w911NF-13-1-0210]
Active, widely tunable optical materials have enabled rapid advances in photonics and optoelectronics, especially in the emerging field of meta-devices. Here, we demonstrate that spatially selective defect engineering on the nanometer scale can transform phase transition materials into optical metasurfaces. Using ion irradiation through nanometer-scale masks, we selectively defect-engineered the insulator-metal transition of vanadium dioxide, a prototypical correlated phase-transition material whose optical properties change dramatically depending on its state. Using this robust technique, we demonstrated several optical metasurfaces, including tunable absorbers with artificially induced phase coexistence and tunable polarizers based on thermally triggered dichroism. Spatially selective nanoscale defect engineering represents a new paradigm for active photonic structures and devices.
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