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Large-scale, power-efficient Au/VO2 active metasurfaces for ultrafast optical modulation
- Source :
- Nanophotonics, Vol 10, Iss 2, Pp 909-918 (2020)
- Publication Year :
- 2020
- Publisher :
- De Gruyter, 2020.
-
Abstract
- Active metasurfaces, in which the optical property of a metasurface device can be controlled by external stimuli, have attracted great research interest recently. For optical switching and modulation applications, high-performance active metasurfaces need to show high transparency, high power efficiency, as well as ultrafast switching and large-scale fabrication capability. This paper reports Au/VO2-based active metasurfaces meeting the requirements above. Centimeter-scale Au/VO2 metasurfaces are fabricated by polystyrene sphere colloidal crystal self-assembly. The devices show optical modulation on-off ratio up to 12.7 dB and insertion loss down to 3.3 dB at 2200 nm wavelength in the static heating experiment, and ΔT/T of 10% in ultrafast pump-probe experiments. In particular, by judiciously aligning the surface plasmon resonance wavelength to the pump wavelength of the femtosecond laser, the enhanced electric field at 800 nm is capable to switch off the extraordinary optical transmission effect at 2200 nm in 100 fs time scale. Compared to VO2 thin-film samples, the devices also show 50% power reduction for all-optical modulation. Our work provides a practical way to fabricate large-scale and power-efficient active metasurfaces for ultrafast optical modulation.
- Subjects :
- Materials science
Scale (ratio)
QC1-999
All optical modulation
02 engineering and technology
01 natural sciences
all-optical modulation
010309 optics
vo2
0103 physical sciences
Electrical and Electronic Engineering
Surface plasmon resonance
business.industry
Physics
Power efficient
021001 nanoscience & nanotechnology
Atomic and Molecular Physics, and Optics
Electronic, Optical and Magnetic Materials
metasurface
Modulation
phase change materials
Optoelectronics
0210 nano-technology
business
Ultrashort pulse
surface plasmon resonance
Biotechnology
Subjects
Details
- Language :
- English
- ISSN :
- 21928614 and 21928606
- Volume :
- 10
- Issue :
- 2
- Database :
- OpenAIRE
- Journal :
- Nanophotonics
- Accession number :
- edsair.doi.dedup.....f1807e01700ec57ea1ac46d2d664f449