Abstract
A highly sensitive absorption-based sensor based on folded split-ring metamaterial graphene resonators (FSRMGRs) is designed, and its biomedical application in terahertz (THz) spectrum is investigated. The sensor has a nearly perfect absorption, with a spectral absorption coefficient of 99.75% at 4 THz and an average Q-factor of 13.76. The resonance peak frequency is sensitive to the refractive index (RI) of the test medium (analyte), and a fairly high sensitivity of 851 GHz/RIU has been obtained. The specifications of the sensor can be tuned by an external DC-bias voltage applied to the graphene layer. According to the obtained results, the developed absorber appears to be a good candidate bio-sensing applications.
Highlights
The terahertz (THz) electromagnetic spectrum (0.3–10 THz) has attracted significant interest due to the unique features of its frequency band
We have proposed a high sensitivity refractive index (RI) sensor composed of an array of folded split ring MTMs graphene-based resonators (FSRMGRs)
Based on the results provided in Table. 1, the maximum sensitivity is 860 GHz/RIU which is a significant result compared to current research [57,58,59,60,61,62,63,64,65,66,67]
Summary
The terahertz (THz) electromagnetic spectrum (0.3–10 THz) has attracted significant interest due to the unique features of its frequency band. MPA can be used as a RI sensor with a high sensitivity to changes in the characteristics of its environment [23,24,25,26,27]. The RI sensors based on the structure of the MTMs can have a high detection speed and low environmental damages, and they are excellent options for biomedical sensing [28,29,30,31,32]. A refractive index MTMs biosensor based on split-ring resonator (SRR) on a Teflon substrate with a sensitivity of 300 GHz/RIU is represented in [34]. We have proposed a high sensitivity RI sensor composed of an array of folded split ring MTMs graphene-based resonators (FSRMGRs). The outcome of the work indicates that the designed structure can be used for THz biomedical sensors applications
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