Abstract
Here, a novel plasmon-induced transparency (PIT) sensing platform based on a Kretschmann–Raether configuration with graphene/J-aggregate materials is proposed. The J-aggregate material, despite its dielectric optical properties, can strongly confine the surface wave-like metal layers. These features promise to highly enlarge the range of plasmonic sensing devices. Therefore, the sensing parameters have been numerically and experimentally investigated using the finite-difference time-domain (FDTD) method and atomic force microscopy (AFM). The results show that the PIT resonance of the structure has a sharp reflection, in turn, leads to high sensitivity. To deep benchmark the structure, the effects of the structural parameters and environmental variables such as temperature and magnetic field on the sensing properties of the device are analyzed in detail. The maximum sensitivity is obtained as high as 1400 angle per refractive-index unit (RIU) with an extra high figure of merit of 36 RIU−1 around the PIT resonance angle of 53°. By considering the magnetic field of 0.01 T and graphene chemical potential of μ = 0.4 eV and environmental room temperature, the proposed structure may potentially be applied in advanced off-chip PIT sensors.
Highlights
Sensors, as an analytical and efficient tool, play a significant role in different fields, including medical science [1], military [2], industrial [3], and agriculture [4]
Plasmonics temperatures, so one of our priorities is that the sensor will continue its diagnostic function with sufficient accuracy at room temperature [14]
The results show that the proposed device can find potential applications in off-chip sensors
Summary
As an analytical and efficient tool, play a significant role in different fields, including medical science [1], military [2], industrial [3], and agriculture [4]. They could control the transmission spectrum and the transparent window by changing the dimensions of the defect, the radius of the resonance rings, the waveguide width, and the refractive index of the medium In this regard, the sensitivity, sensor transparency, and FOM were determined theoretically as 1160 nm/RIU, 8.62 × 10−5 RIU, and 73 RIU−1, respectively. There are limitations to the transmission length of surface plasmons between metal and dielectric For this purpose, graphene has been introduced as an important candidate in the field of plasmonics, which is known as a two-dimensional material derived from carbon atoms, with a honeycomb structure and properties such as the adjustability to control the energy gap by changing the chemical potential or excitation voltage [48], the singleatom thickness [49], higher velocity due to scattering, and lower number of collisions. The results show that the proposed device can find potential applications in off-chip sensors
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