A specially designed tri-tunable pixelated metamaterial was investigated emphasizing the transmission characteristics. The top metasurface (of metamaterial) was comprised of squared pixels of SrTiO3 and graphene mediums deposited over an indium antimonide nanolayer; the SiO2 dielectric medium constitutes the bottom substrate. The transmission characteristics of metamaterial, along with the electrical and magnetic tuning, were artificially controlled, and therefore, the effects due to altering external stimuli, such as thermal ambience, graphene chemical potential, and magnetostatic bias, were studied. The results yielded high sensitivity resonance transmission in the THz frequency range. The ON/OFF switching states of metamaterial, as illustrated in the form of transmission spectra, supported very high (∼98 % ) or almost vanishing transmission in the 1 to 6 THz frequency range along with the polarization-insensitive property. In addition, the response to the incidence obliquity also remained fairly stable. The results reveal the potentials of the reported metamaterial in optical sensing due to its capabilities under the thermal, electrical, and magnetic stimulations.
Vanadium nitride (VN)-based metamaterial absorber was investigated for ultra-wideband (UWB) nearly perfect absorber in the visible to infrared regime of the electromagnetic spectrum considering four different VN samples, namely VN6, VN8, VN10, and VN12. The absorption properties were extracted for the transverse electric and transverse magnetic incidence waves under different obliquities, and also, considering different parametric conditions of the metamaterial. The constitutive properties of VN samples were initially extracted, followed by the effective constitutive properties of metasurface comprising the nanostrips of VN6 and VN10 mediums as the illustrative examples. The results determine achieving nearly perfect UWB absorption in the stated regime of operating wavelength. Spectral characteristics were also obtained while using other reflectors at the bottom. The results demonstrate using VN at the bottom yields significantly improved spectral features. The absorption related results were also evaluated exploiting the interference theory, and the obtained discrepancies were highlighted.
Switching and/or sensing characteristics of a specially designed three-layer metamaterial configuration were studied. In particular, the top metasurface is comprised of squared pixels of strontium titanate (SrTiO3) and graphene mediums, deposited over an InSb nanolayer; the SiO2 dielectric medium constitutes the bottom substrate. The proposed structure could be artificially controlled and tuned, and therefore, the effects due to altering ambient temperature, graphene chemical potential and magnetostatic bias were studied. The results exhibit high sensitivity resonance transmission in the THz frequency range. The optical switching ON/OFF states of the structure, as represented in the form of transmission spectra, were reported supporting very high (~98%) or almost vanishing transmission.
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