Journal
OPTICS EXPRESS
Volume 28, Issue 3, Pages 4225-4233Publisher
Optica Publishing Group
DOI: 10.1364/OE.383678
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Funding
- Agency for Science, Technology and Research [SERC 1720700038, SERC A1883c0002]
- Ministry of Education - Singapore [RG177/17]
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Metasurface with thin planar resonant elements offers great capability in manipulating electromagnetic waves and their interaction with semiconductors. Split-ring resonator (SRR), as the basic building block, has been extensively investigated for myriad applications owing to its multiple electric and magnetic resonant modes. In this work, we report a rotated fourfold U-shape SRR metasurface for polarization-insensitive strong enhancement of mid-infrared photodetection. The integrated photodetector consists of a rotated fourfold SRR array and an InAsSb based heterojunction photodiode. A photosensitivity enhancement factor as high as 11 has been achieved by adoption of superimposed high order magnetic and electric resonant modes in the SRR metasurface. This work provides a promising pathway for exploring high performance polarization-insensitive photodetection in different electromagnetic wave ranges. (C) 2020 Optical Society of America under the terms of the OSA Open Access Publishing Agreement
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