期刊
NATURE PHOTONICS
卷 11, 期 6, 页码 390-+出版社
NATURE PUBLISHING GROUP
DOI: 10.1038/NPHOTON.2017.64
关键词
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资金
- US Department of Energy (DOE), Office of Basic Energy Sciences, Division of Materials Sciences and Engineering
- US DOE National Nuclear Security Administration [DE-AC04-94AL85000]
- National Science Foundation [CHE-150794]
- Army Research Office [W911NF-16-1-0037]
- Division Of Chemistry
- Direct For Mathematical & Physical Scien [1507947] Funding Source: National Science Foundation
Ultrafast control of the polarization state of light may enable a plethora of applications in optics, chemistry and biology. However, conventional polarizing elements, such as polarizers and waveplates, are either static or possess only gigahertz switching speeds. Here, with the aid of high-mobility indium-doped cadmium oxide (CdO) as the gateway plasmonic material, we realize a high-quality factor Berreman-type perfect absorber at a wavelength of 2.08 mu m. On sub-bandgap optical pumping, the perfect absorption resonance strongly redshifts because of the transient increase of the ensemble-averaged effective electron mass of CdO, which leads to an absolute change in the p-polarized reflectance from 1.0 to 86.3%. By combining the exceedingly high modulation depth with the polarization selectivity of the perfect absorber, we experimentally demonstrate a reflective polarizer with a polarization extinction ratio of 91 that can be switched on and off within 800 fs.
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