Advanced Photonics, Volume. 6, Issue 2, 026007(2024)
In situ photoelectric biosensing based on ultranarrowband near-infrared plasmonic hot electron photodetection
Fig. 1. Au-covered Si gratings used for narrowband NIR photodetection. (a) Schematic of the proposed Au/Si nanojunction. Surface localized plasmonic resonance supported by the Au/Si gratings is plotted with an overlap to the gratings, which is expected to improve the surface sensing. The
Fig. 2. Optical characterization of Au/Si gratings. (a) Simulated absorption spectra for
Fig. 3. Optoelectronic characterization of the proposed narrowband PDs. (a) Power-dependent photocurrent of the on-resonance device. The incident beam (launched by a 1342 nm laser) was fixed at an incident angle of 28.7 deg. The inset is the output
Fig. 4. Sensing performance of the narrowband plasmonic PD. (a) Calculated absorption spectra in the case of bulk sensing.
Fig. 5. Rabbit IgG detection experiment. (a) Schematic of plasmonic sensor surface modification and rabbit IgG detection process. (b) Real-time current output from the sensor with the rabbit IgG solution injection at three concentrations in sequence. The inset shows the noise level during the measurement.
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Xianghong Nan, Wenduo Lai, Jie Peng, Haiquan Wang, Bojun Chen, Huifan He, Zekang Mo, Zikun Xia, Ning Tan, Zhong Liu, Long Wen, Dan Gao, Qin Chen. In situ photoelectric biosensing based on ultranarrowband near-infrared plasmonic hot electron photodetection[J]. Advanced Photonics, 2024, 6(2): 026007
Category: Research Articles
Received: Sep. 30, 2023
Accepted: Mar. 4, 2024
Published Online: Mar. 25, 2024
The Author Email: Wen Long (longwen@jnu.edu.cn), Chen Qin (chenqin2018@jnu.edu.cn)