Journal
APL PHOTONICS
Volume 3, Issue 5, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.5011420
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Funding
- Royal Society [UF130493]
- EPSRC [EP/L015277/1, EP/P021859/1]
- U.S. Department of Energy's National Nuclear Security Administration [DE-NA-0003525]
- U.S. Department of Energy, Office of Basic Energy Sciences, Division of Materials Sciences and Engineering
- EPSRC [EP/P021859/1] Funding Source: UKRI
- Royal Society [UF130493] Funding Source: Royal Society
- Engineering and Physical Sciences Research Council [EP/P021859/1, 1624500] Funding Source: researchfish
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We designed an optically thin photoconductive channel as an all-dielectric metasurface comprising an array of low-temperature grownGaAs nanobeams and a sub-surface distributed Bragg reflector. The metasurface exhibited enhanced optical absorption, and it was integrated into a photoconductive THz detector, which showed high efficiency and sensitivity as a result. The detector produced photocurrents over one order of magnitude higher compared to a similar detector with an unstructured surface with only 0.5 mW of optical excitation while exhibiting high dark resistance required for low-noise detection in THz time-domain spectroscopy and imaging. At that level of optical excitation, the metasurface detector showed a high signal to noise ratio of 10(6). The detector showed saturation above that level. (c) 2018 Author(s).
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