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2000
Volume 2, Issue 1
  • ISSN: 2772-3348
  • E-ISSN: 2772-3356

Abstract

Introduction

This research puts forward a cost-efficient high-efficiency plasmonic photonic crystal sensor for biomedical applications that functions in the near-infrared range.

Methods

The sensor design is composed of multiple two-dimensional photonic crystal layers stacked in the order of SiO foundational layer, graphite layer, MgF waveguide, and finally a gold ring over the top. The graphite layer is deposited for optimum sensing and high absorption peaks and is state-of-the-art in this research work. Metal deposition of the gold layer is used for harnessing plasmonic properties that play a vital role in detecting small refractive index changes.

Results

The sensor design is investigated for a range of coupling incident angles and it is found that the sensor is responsive to a broad range of angles , 0o to 80o. The proposed sensor has given output peak values of more than 90% in the whole range of incident source angles.

Conclusion

Finally, water and 25% concentration of glucose samples are used for investigating sensor performance and it is noted that the sensor’s sensitivity reaches as high as 1675 nm/RIU-1 with a Figure of Merit (FOM) of 20.94 RIU-1. The sensor’s numerical simulations have been performed using Finite Element Method (FEM) and Finite Difference Time Domain (FDTD).

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2024-12-27
2025-09-04

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Gold Ring and Graphite-Based Plasmonic Photonic Crystal Sensor for Biomedical Applications
Curr. Physics 2, E27723348340085 (2025); https://doi.org/10.2174/0127723348340085241218173241
/content/journals/cphs/10.2174/0127723348340085241218173241
/content/journals/cphs/10.2174/0127723348340085241218173241
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  • Article Type:     Research Article
Keyword(s): Biomedical sensors; FDTD; FEM; graphite layer; photonic crystals; plasmonics; refractive index; sensitivity

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