Near-infrared waveband, especially in 1100-1300 nm, has extremely high spectral information density and attracts enormous interest in the areas of photodetection and spectroscopy. However, achieving hyperspectral resolution detection in this band has been a long-standing challenge owing to the restriction and interference of bandgaps in common semiconductor materials. Additionally, micrometer-scale thickness of the multifilm filter will also introduce extra complexity to the detection system. Herein, we tailor a plasmonic topological architecture covering a pyroelectric detector, which can excite a special type of surface lattice resonances and consequently generate excellent narrowband characteristics in the vicinity of 1100 nm. Merely relying on tens of nanometers of thickness of the topological layer, the full width at half-maximum of detector response can be as low as 1 nm with a Q factor of 1168, far surpassing the level of ordinary plasmonic metasurfaces. Furthermore, the wavelength and width of its response peak can be continuously engineered by controlling the period and orientation angle of the architectures, while its response speed is also improved significantly with the assistance of a plasmonic topological layer. Our work provides a concise and effective strategy to develop hyperspectral resolution photodetectors without inherent constraints of materials and wavebands.
Wang et al. (Mon,) studied this question.