Photonics Research, Volume. 11, Issue 10, 1657(2023)
Plasmon resonance-enhanced graphene nanofilm-based dual-band infrared silicon photodetector
Fig. 1. Plasmonic-enhanced nMAG–Au–Si nanostructure architecture. (a) Schematic of the nMAG–Au–Si nanostructure fabrication process using the nanosphere lithography method. (b), (c) Oblique view SEM images of the Si cylinder with the metallic nanostructure. The top–bottom metallic layer was deposited by 3 nm Ti and 30 nm Au. (d) Top view SEM image of the nMAG transferred on the metallic nanostructures. (e) Close-up SEM image of the area outlined by the dashed box in panel (d) shows the metallic coupled plasmon covered by nMAG film. The scale bars are 1 μm, 300 nm, 100 μm, and 2 μm in panels (b)–(e), respectively. (f) Raman spectrum of nMAG. (g) X-ray photoelectron spectroscopy (XPS) profile of the nMAG with no detectable oxygen peak (531.5 eV). C represents the carbon peak.
Fig. 2. Device structural characterization of the dual-band IR photodetector. (a) Schematic of the nMAG–Au–Si device showing the charge transport and the surface plasmon polariton coupled to the nMAG. The top schematic diagram shows the absorbance of the dual-band photodetector. (b) Wavelength-dependent properties of experimental (solid blue line) and simulated (red dashed line) reflection spectra. (c), (d) Current as a function of the bias voltage under laser illumination at 1342 nm and 1850 nm under different excitation power, respectively.
Fig. 3. Mechanism for the enhancement electric field of the nMAG–Au–Si photodetector. (a)–(d) Simulated electric field distribution of the nanostructure-based device under illumination with the wavelengths of 1175, 1342, 1850, and 1990 nm, respectively.
Fig. 4. Optoelectric characteristics of the plasmonic nanostructure-based photodetector with enhanced photoresponse. (a) The band diagram is associated with the hot-carrier generation by the PTI effect and SPR-induced process under infrared light optical excitation of the nMAG–Au–Si photodetector. (b), (c) Photocurrent as a function of different incident power densities with (red squares) and without (blue triangles) nanostructures under the bias of
Fig. 5. Hot-carrier transport in nMAG. (a) 2D transient absorption mapping of nMAG on
Fig. 6. Specific detectivity (
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Xinyu Liu, Shaoxiong Wu, Xiaoxue Cao, Feng Tian, Srikrishna Chanakya Bodepudi, Muhammad Malik, Chao Gao, Li Peng, Huan Hu, Yang Xu, "Plasmon resonance-enhanced graphene nanofilm-based dual-band infrared silicon photodetector," Photonics Res. 11, 1657 (2023)
Category: Optical Devices
Received: May. 31, 2023
Accepted: Jul. 30, 2023
Published Online: Sep. 20, 2023
The Author Email: Li Peng (l-peng@zju.edu.cn), Huan Hu (huanhu@intl.zju.edu.cn), Yang Xu (yangxu-isee@zju.edu.cn)