In this study, we present and establish a gold surface plasmon polariton (SPP) GaAs photodetector that achieves high internal quantum efficiency (IQE). At a wavelength of 600 nm, the IQE with the SPP was 85%, while the IQE without the SPP was 42%, an enhancement of 43%. Also, at a wavelength of 675 nm, the IQE with SPP was 82%, whereas the IQE without SPP was 45%, which constitutes an increase of 37%. Such excellent performance is ascribed to the subwavelength scope of the optical power in the photoconductive-based gold SPP GaAs that provides high IQE. Moreover, the recombination of the SPP in the photodetector provides greater photocurrent and responsivity.

中文翻译：

---

使用等离子光栅的GaAs光电探测器的高性能增强

在这项研究中，我们提出并建立了一种可实现高内部量子效率（IQE）的金表面等离子体激元（SPP）GaAs光电探测器。在600 nm波长处，使用SPP的IQE为85％，而不使用SPP的IQE为42％，提高了43％。此外，在675 nm的波长下，带有SPP的IQE为82％，而没有SPP的IQE为45％，增加了37％。这种优异的性能归因于提供高IQE的基于光电导的金SPP GaAs中光功率的亚波长范围。此外，SPP在光电探测器中的重组可提供更大的光电流和响应度。