Dual‐Region Resonant Meander Metamaterial

Abstract

Metamaterials are engineered structures designed to interact with electromagnetic radiation, whereby the frequency range in which metamaterials respond depends on their dimensions. In this paper, it is demonstrated that a metamaterial can be functional in more than one frequency region. An advanced metamaterial is demonstrated that can interact with both terahertz (THz) and near‐infrared (NIR) frequencies, concurrently. This work exploits meander line resonators with nanoscale linewidth distributed over microscale areas, and experimentally demonstrates that such a metamaterial can simultaneously interact with NIR and THz waves. The engineered metamaterial acts as a plasmonic grating in the NIR range and simultaneously acts as an array of electric resonators in the THz range. Moreover, the performance of the engineered metamaterial is polarization‐independent in both wavelength regions. Finally, a unique feature of the proposed metamaterial is that it enables resonant frequency tuning in the THz region without affecting the NIR response. All these novel advantages of dual‐band meander metamaterial make it an ideal alternative for cutting‐edge applications such as bi‐functional sensing, imaging, filtering, modulation, and absorption.

Independently tunable all-dielectric synthetic multi-spectral metamaterials based on Mie resonance

“…[27][28][29][30] On the other hand, the spectral tunability is an important factor affecting the performance of the MM. A single dual-region MM based on meander line resonators has been reported by Manjunath et al 31 The MM produced in this work can be functional in both THz and NIR frequencies simultaneously. Although the THz resonant frequency can be adjusted by increasing the gap between meta-atoms while having a negligible impact on the NIR transmission spectrum, the NIR resonant frequency cannot be tuned independently without affecting the THz response.…”

Cross‐Wavelength Hierarchical Metamaterials Enabled for Trans‐Scale Molecules Detection Simultaneously

“…Conventional metamaterials can achieve the resonant response and can be operated at a combination of dual and triple‐band. [ 12 , 27 , 28 , 29 , 30 , 31 ] They are designed for a specific application, due to the difficulty and low flexibility of adapting their functions once fabricated. Therefore, it is challenging to fabricate metamaterials with a single type of meta‐atom with ultra‐broadband adaptability in controlling EM waves, due to the huge diversity between the critical subwavelength feature sizes of the artificial atom.…”

“…[ 7 , 8 , 9 ] However, the critical feature sizes of meta‐atom spans serval orders of magnitude in length scale, from few nanometers to tens of centimeters, almost all the metamaterials are designed to operate at a specific frequency, [ 10 ] a narrow band, [ 11 ] or a combination of dual and triple‐band. [ 12 , 13 ] Nevertheless, once the metamaterials are fabricated, their functions will be fixed or have only a limited adjustable range. Therefore, it is challenging to fabricate metamaterials with a single type of meta‐atom with ultra‐broadband adaptability in controlling EM waves.…”

Enhancing Multi-Spectral Fingerprint Sensing for Trace Explosive Molecules with All-Silicon Metasurfaces

“…Multi-spectral metasurfaces have been widely used in other fields, such as absorbers, resonators, and filters [32]. For example, Man-junath et al, presented a single dual-region metasurface based on meander line resonators, which can interact with near-infrared and THz waves at the same time [33]. Grant et al, reported a synthetic multi-spectral metasurface achieved through hybridizing optical plasmonic filtering with mid-IR and THz absorption, thereby manipulating radiation in multiple regions simultaneously [34].…”