AI Article Synopsis

  • - The study explores a new graphene-based absorber that achieves over 98% perfect absorption across multiple frequencies in the Medium Wavelength Infra-Red (MWIR) range, outperforming traditional absorbers.
  • - This absorber is structured with a gold bottom layer, a dielectric middle layer, and a graphene-patterned top layer, allowing for tunability by modifying graphene's Fermi energy.
  • - Notably, the design showcases polarization insensitivity and high sensitivity (21.60 THz/RIU), making it promising for use in advanced multi-frequency sensors.

Article Abstract

As graphene-related technology advances, the benefits of graphene metamaterials become more apparent. In this study, a surface-isolated exciton-based absorber is built by running relevant simulations on graphene, which can achieve more than 98% perfect absorption at multiple frequencies in the MWIR (MediumWavelength Infra-Red (MWIR) band as compared to the typical absorber. The absorber consists of three layers: the bottom layer is gold, the middle layer is dielectric, and the top layer is patterned with graphene. Tunability was achieved by electrically altering graphene's Fermi energy, hence the position of the absorption peak. The influence of graphene's relaxation time on the sensor is discussed. Due to the symmetry of its structure, different angles of light source incidence have little effect on the absorption rate, leading to polarization insensitivity, especially for TE waves, and this absorber has polarization insensitivity at ultra-wide-angle degrees. The sensor is characterized by its tunability, polarisation insensitivity, and high sensitivity, with a sensitivity of up to 21.60 THz/refractive index unit (RIU). This paper demonstrates the feasibility of the multi-frequency sensor and provides a theoretical basis for the realization of the multi-frequency sensor. This makes it possible to apply it to high-sensitivity sensors.

Download full-text PDF

Source
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC11054719PMC
http://dx.doi.org/10.3390/s24082658DOI Listing

Publication Analysis

Top Keywords

polarization insensitivity
8
multi-frequency sensor
8
sensor
5
tunable high-sensitivity
4
high-sensitivity four-frequency
4
four-frequency refractive
4
refractive sensor
4
sensor based
4
graphene
4
based graphene
4

Similar Publications

Want AI Summaries of new PubMed Abstracts delivered to your In-box?

Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!