Supercell-enhanced multimodal plasmonic sensor for high-fidelity antigen detection via refractive index modulation
Abstract In this study, we investigate a multispectral plasmonic refractive index sensor based on a ring resonator supercell array for the detection of carcinoembryonic antigen (CEA), prostate-specific antigen (PSA), and hemoglobin (Hb). The sensor exhibits three resonance modes within the 1000–3000...
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| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
| Published: |
Nature Portfolio
2025-07-01
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| Series: | Scientific Reports |
| Subjects: | |
| Online Access: | https://doi.org/10.1038/s41598-025-08081-4 |
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| Summary: | Abstract In this study, we investigate a multispectral plasmonic refractive index sensor based on a ring resonator supercell array for the detection of carcinoembryonic antigen (CEA), prostate-specific antigen (PSA), and hemoglobin (Hb). The sensor exhibits three resonance modes within the 1000–3000 nm wavelength range, analyzed using the finite-difference time-domain (FDTD) method. Through meticulous optimization of the sensor’s geometrical structure, we achieve a high figure of merit (FOM) and sensitivity. Notably, the second resonance mode attains the highest sensitivity of 913.51 nm/RIU. Furthermore, the third resonance mode achieves an FOM exceeding 70 RIU−1, underscoring its potential for specialized biomedical applications. Extensive research has established a strong correlation between elevated antigen concentrations, including CEA, PSA, and hemoglobin, and the presence of cancer and other critical diseases. With advancements in optical biosensing technology, this sensor offers a promising pathway toward cost-effective, portable, and highly sensitive diagnostic tools, contributing to public health and improved quality of life. |
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| ISSN: | 2045-2322 |