Design of Dual-Band Plasmonic Absorber for Biomedical Sensing and Environmental Monitoring

TL;DR

This paper presents a dual-band plasmonic absorber capable of high-sensitivity detection in NIR and MIR regions, suitable for biomedical and environmental sensing applications.

Contribution

It introduces a novel dual-band plasmonic absorber with validated high sensitivity for detecting biomolecules and environmental solutes.

Findings

Two distinct absorption peaks in NIR and MIR regions.

High refractive index sensitivity demonstrated through simulations.

Potential for applications in medical diagnostics and environmental monitoring.

Abstract

This study introduces a dual-band plasmonic absorber designed for simultaneous sensing applications in the near-infrared (NIR) and mid-infrared (MIR) regions. The absorber, composed of silver nanostructures on a metal plate with a dielectric spacer, exhibits a combination of localized and gap surface plasmon resonances, resulting in two distinct absorption peaks in theoretical analysis based on the FDTD method. Numerical simulations also validate the sensor's high refractive index sensitivity, enabling the detection of biomolecules, proteins, viruses, and various solutes in aqueous solutions. The absorber demonstrates significant resonance shifts, making it a promising candidate for environmental monitoring, medical diagnostics, and chemical sensing.