Background: Split ring resonators are fundamental structures used to design metamaterial
structures. These split ring resonators are designed for various scientific applications with complex and
simple geometrical shapes. Metamaterials provide the extended spectral resolution, which is beyond the
scope of conventional devices reported in open literature. Such metamaterials when operated on the
non-ionizing terahertz frequencies (0.1-10 THz) are highly suitable for non destructive sensing of living
Methods: The objective of this research work is to evaluate the performance of classic square split ring
resonator as a metamaterial biosensor operating at terahertz frequency by depositing thin layers of
dielectric materials resembled as hybridized layers of DNA sample.
Results: Highly localized surface electric field distribution indicates strong LC resonance at resonant
frequency. Electric field is focused on the capacitive coupled split gap area. The effective parameters of
biosensor clearly showed left handedness that is negative permittivity and permeability and refractive
index. Biosensor was analyzed by observing shift in transmission (S21) coefficients. Resonant frequency
shifts itself towards the lower end of terahertz band due to the loading of thin layers of samples that are
composed of different dielectric materials.
Conclusion: Metamaterial biosensor sense the presence of tiny layers of different dielectric materials.
This was due to the fact that disturbances in the surface electric field caused change in transmission of
sensor's resonant frequency. The simple design of the sensor would overcome the issue of reusability of
circuit. Such sensor would highly be suitable for sensing the presence of tiny bio molecules.