Abstract
We propose a theoretical design principle of polarization-insensitive metal–semiconductor–metal (MSM) structure for ultraviolet photodetectors based on one-dimensional nanogratings. Because the Fabry–Pérot cavity modes supported by a 100-nm-thick ZnO layer with nanostructures for transverse electric and transverse magnetic polarized incidence overlap with each other, a polarization-insensitive absorption enhancement for the ZnO layer at UV wavelengths is achieved, which can be implemented as a nano-interdigitated electrode to address a long-existing limitation between the speed and the responsivity for conventional MSM photodetectors.
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Acknowledgments
H. Hu and Q. Gan are supported by NSF (Award # ECCS 1128086). S. Jiang is supported by NSFC (Award # 51001029).
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Hu, H., Zeng, X., Tong, C. et al. Polarization-Insensitive Metal–Semiconductor–Metal Nanoplasmonic Structures for Ultrafast Ultraviolet Detectors. Plasmonics 8, 239–247 (2013). https://doi.org/10.1007/s11468-012-9381-1
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DOI: https://doi.org/10.1007/s11468-012-9381-1