Publications [#321730] of Qing H. Liu

Papers Published

1. Cai, Y; Zhu, J; Liu, QH; Lin, T; Zhou, J; Ye, L; Cai, Z, Enhanced spatial near-infrared modulation of graphene-loaded perfect absorbers using plasmonic nanoslits., Optics Express, vol. 23 no. 25 (December, 2015), pp. 32318-32328 [doi]
   (last updated on 2023/08/08)

   Abstract:
   Modulating spatial near-infrared light for ultra-compact electro-optic devices is a critical issue in optical communication and imaging applications. To date, spatial near-infrared modulators based on graphene have been reported, but they showed limited modulation effects due to the relatively weak light-graphene interaction. In combination with graphene and metallic nanoslits, we design a kind of ultrathin near-infrared perfect absorber with enhanced spatial modulation effects and independence on a wide range of incident angles. The modulated spectral shift of central wavelength is up to 258.2 nm in the near-infrared range, which is more promising in applications than state-of-the-art devices. The modulation enhancement is attributed to the plasmonic nanoslit mode, in which the optical electric field is highly concentrated in the deep subwavelength scale and the light-graphene interaction is significantly strengthened. The physical insight is deeply revealed by a combination of equivalent circuit and electromagnetic field analysis. The design principles are not only crucial for spatial near-infrared modulators, but also provide a key guide for developing active near-infrared patch nanoantennas based on graphene.