A thermally stable and polarization insensitive square-shaped water metamaterial with ultra-broadband absorption

This study aims to design a metamaterial sensor to detect glucose levels in the human body so that the severity of diabetic patients can be determined.The biomolecules are placed over gold metamaterial to observe the behavior of the sensor. The proposed model is analyzed for both phases of GST (amorphous GST [aGST] phase and crystalline GST [cGST] phase). The design is analyzed for parameters like absorption, angle of incidence of light, the concentration of glucose biomolecules, substrate, tuning of the wavelength spectrum, and resonator thickness. The sensor with cGST provides better performance. Observing angle of incidence, 95% absorption is noticed with 48-60°radians for wavelength range 0.85-0.98 μm and with 42-69°radians for wavelength range 0.85-0.98 μm. The analysis depicts that the proposed phase change material-based biosensor in general and with cGST, in particular, is suitable for glucose detection in the blood of diabetic patients.

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Metamaterial‐based refractive index sensor using Ge₂Sb₂Te₅ substrate for glucose detection

Patel

Parmar

Surve

et al. 2022

“…The proposed metamaterial provides five distinct operating bands between 0.1 and 0.6 THz. Furthermore, the application of the THz metamaterial as frequency-selective surface [15][16][17] and absorber [18][19][20][21][22][23] has been widely studied in the literature. In addition, the application of metamaterial for sensing, 24 imaging, 25 antenna property enhancement, 26 and energy harvesting 27 has also been described in the literature.…”

Section: Introductionmentioning

confidence: 99%

Novel polarization independent multiband THz perfect metamaterial

Mathivanan

Saravanan

2022

The design and characterization of a multiband THz metamaterial are reported in this article. The proposed metamaterial is constructed over the polyimide substrate embedded with a novel ring-shaped frequency-sensitive copper trace on the top providing the desired frequency response. The proposed metamaterial is developed from a unit cell with a base cross shape. The arms of the cross shape are deployed with three folded circular resonators providing the desired frequency-selective property. The proposed metamaterial offers band-stop characteristics at 0.83, 2.15, 2.91, 4.1, and 4.86 THz. The proposed unit cell metamaterial has the smallest foot-print of 0.089λ o Â 0.089λ o where λ o is the free-space wavelength. The electric field distribution and surface current contours are used to describe the operation of the proposed metamaterial. The proposed metamaterial has a symmetric configuration resulting in a polarizationindependent operation. The angular stability of the proposed metamaterial is investigated by subjecting the metamaterial to the various oblique incidence of THz radiation. The proposed THz metamaterial unit cell is suitable for THz imaging and spectroscopy applications.

Section: Introductionmentioning

confidence: 99%

“…Surface plasmon resonance has attracted significant interest due to its ability to confine and manipulate light below the diffraction limit and produce high local field intensities. 1,2 Nowadays, 3 plasmonic devices, especially perfect absorbers, have aroused widespread interest due to the wide range of applications such as wavelength selective thermal emitters, 4 solar energy, 5 sensing, [6][7][8][9] light detection, [10][11][12] and so on. Various absorbers, typically consisting of metal-insulator-metal sandwiched structures, have been demonstrated theoretically and experimentally in the microwave, 13,14 terahertz, 15,16 infrared, [17][18][19] and optical frequencies 20 regime since Landy et al gave the first experimental demonstration in 2008.…”

Section: Introductionmentioning

confidence: 99%

Polarization‐independent dual narrow‐band perfect metamaterial absorber for optical communication

Xie

Sun

Wang

et al. 2022

In this paper, we demonstrate a dual narrow‐band perfect metamaterial absorber for optical communication, where a silicon nano‐disk array is placed on a thin gold film separated by a dielectric layer. Numerical results reveal that dual narrow‐band perfect absorption peaks, which are attributed to waveguide mode and magnetic dipole resonance mode, are achieved at 1310 and 1550 nm, respectively. The results show that the absorption of the two peaks is higher than 99% under the normal incidence of both TE and TM polarizations and the bandwidth is 5 and 15 nm, respectively. Moreover, the absorption peak at 1310 nm can be independently tuned by varying the thickness of the dielectric layer. These findings imply that the proposed absorber can be used in the field of optical communication, frequency‐selective photodetection, and intersatellite laser communication.