Next Article in Journal
Advances in Nanofluidics
Next Article in Special Issue
Identification and Speed Estimation of a Moving Object in an Indoor Application Based on Visible Light Sensing of Retroreflective Foils
Previous Article in Journal
An Energy Harvester with Temperature Threshold Triggered Cycling Generation for Thermal Event Autonomous Monitoring
Previous Article in Special Issue
Directional and Fast Photoluminescence from CsPbI3 Nanocrystals Coupled to Dielectric Circular Bragg Gratings
Article

Biosensing Near the Exceptional Point Based on Resonant Optical Tunneling Effect

by 1,2, 1,2, 1,2, 1,2,* and 1,2,*
1
MicroNano System Research Center, Taiyuan University of Technology, Taiyuan 030024, China
2
Key Laboratory of Advanced Transducers and Intelligent Control System, Shanxi Province and Ministry of Education, Taiyuan 030024, China
*
Authors to whom correspondence should be addressed.
Academic Editors: Yi Yang, Yi Zhang, Limin Xiao, Abdel I. El Abed, Shumin Xiao and Xuming Zhang
Micromachines 2021, 12(4), 426; https://doi.org/10.3390/mi12040426
Received: 3 March 2021 / Revised: 9 April 2021 / Accepted: 10 April 2021 / Published: 14 April 2021
(This article belongs to the Special Issue Micro-Nano Science and Engineering)
Inspired by exceptional point (EP) sensing in non-Hermitian systems, in this work, a label-free biosensor for detecting low-concentration analytes is proposed, via a special multilayer structure: a resonant optical tunneling resonator. Due to the square root topology near the exceptional point, a recognized target analyte perturbs the system deviated from the exceptional point, leading to resolvable modes splitting in the transmission spectrum. The performance of the designed sensor is analyzed by the coupled-mode theory and transfer matrix method, separately. Here, the simulation results demonstrate that the obtained sensitivity is 17,120 nm/imaginary part unit of refractive index (IP) and the theoretical detection limit is 4.2 × 10−8 IP (regarding carcinoembryonic antigen (CEA), the minimum detection value is 1.78 ng). Instead of the typical diffusion manner, the liquid sample is loaded by convection, which can considerably improve the efficiency of sample capture and shorten the response time of the sensor. The sketched sensor may find potential application in the fields of biomedical detection, environment protection, and drinking water safety. View Full-Text
Keywords: exceptional point; biosensing; resonant optical tunneling effect; carcinoembryonic antigen exceptional point; biosensing; resonant optical tunneling effect; carcinoembryonic antigen
Show Figures

Figure 1

MDPI and ACS Style

Liu, Y.; Yan, P.; Liu, F.; Jian, A.; Sang, S. Biosensing Near the Exceptional Point Based on Resonant Optical Tunneling Effect. Micromachines 2021, 12, 426. https://doi.org/10.3390/mi12040426

AMA Style

Liu Y, Yan P, Liu F, Jian A, Sang S. Biosensing Near the Exceptional Point Based on Resonant Optical Tunneling Effect. Micromachines. 2021; 12(4):426. https://doi.org/10.3390/mi12040426

Chicago/Turabian Style

Liu, Yang, Pengyun Yan, Feng Liu, Aoqun Jian, and Shengbo Sang. 2021. "Biosensing Near the Exceptional Point Based on Resonant Optical Tunneling Effect" Micromachines 12, no. 4: 426. https://doi.org/10.3390/mi12040426

Find Other Styles
Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Article Access Map by Country/Region

1
Back to TopTop