High-sensitivity metamaterial sensor based on electromagnetically induced transparency (EIT) effect

Abstract

We propose a metamaterial sensor based on electromagnetically induced transparency (EIT) effect, which is composed of two elliptical structures with splits. Based on the coupling of bright and dark modes, a low-loss transparent window is realized at 1.88 THz. Surface current distribution and equivalent circuit model are used to analyze the physical mechanism of the EIT effect. In addition, the sensitivity of the sensor is investigated for different thickness and refractive index for analyte. The simulation results show that when the analyte thickness is 15 μm and the refractive index is between 1 and 1.5, the sensitivity of the sensor is as high as 450.7 GHz/RIU, and the figure of merit (FOM) value is 7.7. And when the refractive index of analyte is 1.5 and its thickness is between 0 and 5 μm, the sensor can also be used for thickness sensing with a sensitivity of 40.8 GHz μm−1. In addition, the proposed metamaterial sensor can be used to simulate the detection of sodium chloride solution, and the sensitivity is 66.2 GHz/ mol d m 3 . These above features indicate that the proposed structure paves the way for designing high-sensitivity EIT sensors in the terahertz region, which plays important roles in promoting terahertz sensing and detection technology.

Electromagnetically induced transparency with magnetically induced Δ F = 0 , m F

“…The MI1 transitions |F g , 0⟩ → |F e = F g , 0 ′ ⟩ explored in the present work preserve their high intensity at much higher B-field values, extending their application areas. Note that the EIT process has a number of important applications in a variety of fields, such as information storage, quantum communication, optical magnetometry and frequency stabilization of atomic clocks [9,19,25,26].…”

Multi-band tunable electromagnetically induced transparencies based on active metasurface with polarization-independent property

“…In addition to bright-dark coupling [14,15], bright-bright coupling is another method to generate EIT phenomenon [16,17]. Different structures have been proposed to construct metasurfaces, including strips, split resonant rings, closed resonant rings, etc [18][19][20]. Deep learning has also been used to design PIT devices [21].…”

Dual circular complementary split ring resonator based metamaterial sensor with high sensitivity and quality factor for textile material detection

“…In addition, several MTM sensors have been employed for a variety of applications in the S-, C-, and X-band frequency spectrum, including microfluidic sensors, 39,40 liquid sensors, 41,42 permittivity sensors, 43 thickness sensors, 44,45 and temperature sensors. 46,47 These sensors perform well, but the sensitivity is low and the Q-factors are moderate. A planar microwave sensor was discussed in Ref.…”