Abstract
Terahertz (THz) detecting technology has attracted many attentions. In this work, a novel THz detector based on a metal gratings/Si-based blocked-impurity-band (BIB) hybrid structure was designed and theoretically calculated. The highly integrated hybrid structure was found useful for modulating the response wavelength and improving the responsivity of Si-based BIB detector. The enhanced THz absorption of the hybrid device structure of metal gratings and Si-based BIB absorption layer was carefully investigated by finite difference time domain. The peak wavelength can be moved from 26.9 to 36.53 μm when metal gratings (period: 32 μm) were added on the Si-based BIB. The peak absorptivity of the hybrid detector was increased by 87.3 % with the metal gratings, compared with that of conventional Si-based BIB detector. Our results indicate that a highly integrated hybrid device structure can replace the divided band filters, and realize selective resonant enhanced absorption and tunable THz spectral response.
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Funding
This work was supported by the National Natural Science Foundation of China (Grant Nos. 61404120, 61705201, and 62171286), Shanghai Outstanding Academic Leaders Plan (21XD1423600), Shanghai Sailing Program (Grant No. 17YF1418100), Shanghai Rising-Star Program (Grant No. 17QB1403900), Young Elite Scientists Sponsorship Program by CAST (Grant No. 2018QNRC001), and Shanghai Youth Top-Notch Talent Development Program.
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Tong, W., Chen, Y., Wang, L. et al. The enhanced terahertz absorption of metal gratings/Si-based blocked-impurity-band (BIB) hybrid structures. Opt Quant Electron 53, 627 (2021). https://doi.org/10.1007/s11082-021-03229-8
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DOI: https://doi.org/10.1007/s11082-021-03229-8