Related Experiment Video
Updated: Feb 19, 2026
Author Spotlight: High-Quality Quantum Dot Nanobeads for Sensitive Fluorescent Lateral Flow Immunoassays
Published on: June 28, 2024
Ultra-sensitive near-infrared graphene photodetectors with nanopillar antennas
Yu Liu1, Wen Huang2, Tianxun Gong2
1State Key Laboratory of Electronic Thin Films and Integrated Devices, University of Electronics Science and Technology of China, Chengdu 610054, People's Republic of China. uestchw@uestc.edu.cn and Institute of Microelectronics and Tsinghua National Laboratory for Information Science and Technology (TNList), Tsinghua University, Beijing 100084, China.
Abstract:
Graphene has been demonstrated as a candidate for optoelectronic devices due to its broad absorption spectrum and ultra-high carrier mobility. However, graphene is essentially transparent in visible and near-infrared regimes with an absorptivity of 2.3%, which largely limits its application in photodetection. Here, we show that metallic nanopillar antennas could improve light absorption in graphene detectors. The coupled antennas help to concentrate a free space electromagnetic wave around the nanopillars by localized surface plasmon resonance, strongly impacted by geometrical design. It is found that spectral selectivity can be realized by tuning key geometrical parameters such as period, radius, and height of the metallic nanopillar, leading to wavelength-tunable photodetectors within a broad range from 0.6 μm to 1.2 μm. With the optimized design, the detector exhibits an excellent photoresponsivity of 7 A W-1 at a wavelength of 0.82 μm.
