Metasurface Absorber for Blood Hemoglobin Concentration

Area of Science:

• Applied Physics
• Biomedical Engineering
• Materials Science

Background:

• Metasurface-based biosensing often faces challenges with sensitivity to design parameters.
• Accurate monitoring of blood hemoglobin concentration is crucial for assessing blood quality.
• Developing sensitive and reliable biosensing platforms remains an active area of research.

Purpose of the Study:

• To develop a sensitive biosensing scenario for monitoring blood hemoglobin concentration.
• To design and model a graphene-based wave absorber for enhanced biosensing sensitivity.
• To address the sensitivity limitations of conventional metasurface-based detection methods.

Main Methods:

• A three-layer graphene-based wave absorber was designed and modeled using passive circuit elements.
• The blood sample was treated as a dielectric with varying refractive indexes based on hemoglobin concentration.
• Impedance matching and full-wave simulations were employed to optimize device performance and validate accuracy.

Main Results:

• The proposed graphene absorber demonstrated dual absorption peaks for efficient blood quality monitoring.
• Simulation results showed frequency shifts in the second absorption peak correlated with hemoglobin concentration.
• The absorber exhibited high reliability against variations in geometrical parameters, incident angle, and external stimuli.

Conclusions:

• The developed graphene-based biosensor offers a sensitive and reliable method for blood hemoglobin monitoring.
• The dual absorption peak mechanism provides a robust approach for blood quality assessment.
• The study validates the effectiveness of the graphene absorber for advanced biosensing applications.