ArticleHeliyon2024
Highly sensitive refractive index sensing with a dual-band optically transparent ITO-based perfect metamaterial absorber for biomedical applications.
Article in Heliyon, 2024. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 6 papers.
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Who cites it
6 citing papers in PubMed.
- Tunable dual-band THz metamaterial absorber with regression-learning-enabled numerical redesign.Scientific reports · 2026Article
- A broadband Terahertz metamaterial absorber enabled by a water-assisted square-pyramid architecture with optical transmittance.Scientific reports · 2026Article
- Design, fabrication and characterization of metamaterial absorber for sensing applications.Scientific reports · 2026Article
- Machine learning-enhanced multi-band metamaterial sensor for early detection of neurological disorders.Scientific reports · 2026Article
- Machine learning-assisted optimization of a terahertz photonic metamaterial absorber for blood cancer detection.PloS one · 2026Article
- Triple-band highly sensitive terahertz metamaterial absorber for biomedical sensing applications.PloS one · 2025Article
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Authors and funding
3 authors.
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Abstract
In this paper, a dual-band optically transparent square-shaped perfect metamaterial absorber operating in the frequency range from 2 to 4 terahertz (THz) is proposed. The structure consists of an indium tin oxide (ITO)-based split ring resonator (SRR) structure with additional splits and rectangular inner strips to form the top layer over the lead glass substrate. Perfect absorption is attained in the frequencies of 2.089 and 3.892 THz with absorbances of 99.99% and 99.98% in TE polarization mode, respectively. Perfect absorption is also achieved in TM polarization mode at 2.23 THz. Broadband absorption is found in TM polarization mode with full width half maximum (FWHM) of 1.1742. The proposed structure has one polarization-insensitive band in TE polarization mode. Absorbance is greater than 80% and 90% in the successive absorption peaks even at 60° and 75° of incidence, respectively. The resonance frequency is sensitive to the refractive index of the medium. As a result, the proposed metamaterial structure may be implemented as a refractive index (RI) sensor with a high sensitivity of 1109 GHz/RIU and 1954 GHz/RIU in both absorption bands for a refractive index range of 1.34 to 1.40. It's interesting to note that the refractive index of most biological samples ranges from 1.3 to 1.39. The figure of merit (FOM) of the proposed sensor can reach as high as 10 and 14 for the 1st and 2nd frequency bands. As a result, the proposed sensor has a high sensitivity and can be employed in medical applications. Potential applications of the proposed absorber include imaging, biomedical sensing, etc.
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