Non-Layered Gold-Silicon and All-Silicon Frequency-Selective Metasurfaces for Potential Mid-Infrared Sensing Applications

Dănilă, Octavian; Mănăilă-Maximean, Doina; Bărar, Ana; Loiko, Valery A.

doi:10.3390/s21165600

Cited by 18 publications

(13 citation statements)

References 61 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The FSS unit cell in general does not contain only metallic elements, as it can be made out of semiconductor-dielectric and all-dielectric components [9]. The silicondielectric and metal-dielectric FSSs are also promising for mid-IR domain, see [10] and also [11].…”

Section: Frequency-selective Surfacesmentioning

confidence: 99%

Arrays of Sub-Terahertz Cryogenic Metamaterial

et al. 2021

View full text Add to dashboard Cite

Integrated quasi-optical cryogenic terahertz receivers contain arrays of detectors, quasi-optical filters, interferometers, and other metamaterials. Matrices of quasi-optical band-pass, low-pass, and high-pass filters, Fabry–Perot grid interferometers, and arrays of half-wave and electrically small antennas with superconductor-insulator-normal metal-insulator-superconductor (SINIS) sub-terahertz wavelength range detectors were fabricated and experimentally studied on the same computational, technological, and experimental platform. For the design of the filters, we used the periodic frequency-selective surfaces (FSS) approach, contrary to detector arrays that can be presented in a model of distributed absorbers. The structures were fabricated using direct electron beam lithography, thermal shadow evaporation, lift-off, alternatively magnetron sputtering, and chemical and plasma etching. The numerical simulation methods of such structures are sufficiently different: for the reactive matrices with low losses, the approximation of an infinite structure with periodic boundary conditions is applicable, and for the arrays of detectors with dissipative elements of absorbers, a complete analysis of the finite structure with hundreds of interacting ports is applicable. The difference is determined by the presence of dissipation in the detector arrays, the phase of the reflected or re-emitted signal turned out to be undefined and the Floquet periodic boundary conditions are correct only for a phased array antenna. The spectral characteristics of the created filters, interferometers, and antenna arrays were measured in the frequency range 50–600 GHz.

show abstract

Section: Frequency-selective Surfacesmentioning

confidence: 99%

Arrays of Sub-Terahertz Cryogenic Metamaterial

et al. 2021

View full text Add to dashboard Cite

show abstract

“…So far, the majority of metamaterial designs were based on ring resonator geometries, typically split-ring resonators (SRRs), which can be also defined as simple inductor-capacitor (LC) circuits with the resonance frequency scaled inversely with their lateral size [5]. Metamaterials allow for a design of the spatial distribution of optical constants with a finer resolution than the wavelength, and thereby realize useful and novel devices such as very thin and flat lenses [6][7][8][9][10][11][12][13][14][15], invisibility cloaks [16][17][18][19], sensors [20][21][22], and imaging [23,24] at various frequency bands.…”

Section: Introductionmentioning

confidence: 99%

Analysis of Asymmetry in Active Split-Ring Resonators to Design Circulating-Current Eigenmode: Demonstration of Beamsteering and Focal-Length Control toward Reconfigurable Intelligent Surface

Kitayama

Pander

Takahashi

2022

Sensors

View full text Add to dashboard Cite

In this work, toward an intelligent radio environment for 5G/6G, design methodologies of active split-ring resonators (SRRs) for more efficient dynamic control of metasurfaces are investigated. The relationship between the excitation of circulating-current eigenmode and the asymmetric structure of SRRs is numerically analyzed, and it is clarified that the excitation of the circulating-current mode is difficult when the level of asymmetry of the current path is decreased by the addition of large capacitance such as from semiconductor-based devices. To avoid change in the asymmetry, we incorporated an additional gap (slit) in the SRRs, which enabled us to excite the circulating-current mode even when a large capacitance was implemented. Prototype devices were fabricated according to this design methodology, and by the control of the intensity/phase distribution, the variable focal-length and beamsteering capabilities of the transmitted waves were demonstrated, indicating the high effectiveness of the design. The presented design methodology can be applied not only to the demonstrated case of discrete varactors, but also to various other active metamaterials, such as semiconductor-integrated types for operating in the millimeter and submillimeter frequency bands as potential candidates for future 6G systems.

show abstract

“…In comparison to natural materials, metamaterial, as a kind of artificially designed composite material, has supernormal physical properties such as negative refraction and electromagnetic stealth, which natural materials do not have [9][10][11]. In recent years, metasurface, a 2D metamaterial, has attracted more and more attention because of its subwavelength size, planar shape, and multifunction integration [12][13][14][15][16]. Since each nanoscale of a metasurface can independently control the wavefront of the incident beam, the designed purpose can be achieved through different arrangements of the nanoscales, and the incident beam can be reshaped with a large degree of freedom of motion [17][18][19][20][21].…”

Section: Introductionmentioning

confidence: 99%

High Efficiency Focusing and Vortex Generator Based on Polarization-Insensitive Gallium Nitride Metasurface

Sun

et al. 2021

Nanomaterials

View full text Add to dashboard Cite

In this paper, two polarization-insensitive Gallium Nitride (GaN) metasurfaces based on a dynamic phase for adjusting the wavefront are proposed. Specifically, we obtained the target phase to satisfy some design conditions by changing the structural parameters at the nanoscales. Under the irradiation of linearly polarized (LP) light and circularly polarized (CP) light, respectively, one of the metasurfaces can generate a focused beam with an efficiency of 84.7%, and the other can generate a vortex beam with a maximum efficiency of 76.6%. Our designed metasurfaces will have important applications in optical communication, holographic projection, and particle capture.

show abstract

Non-Layered Gold-Silicon and All-Silicon Frequency-Selective Metasurfaces for Potential Mid-Infrared Sensing Applications

Cited by 18 publications

References 61 publications

Arrays of Sub-Terahertz Cryogenic Metamaterial

Arrays of Sub-Terahertz Cryogenic Metamaterial

Analysis of Asymmetry in Active Split-Ring Resonators to Design Circulating-Current Eigenmode: Demonstration of Beamsteering and Focal-Length Control toward Reconfigurable Intelligent Surface

High Efficiency Focusing and Vortex Generator Based on Polarization-Insensitive Gallium Nitride Metasurface

Contact Info

Product

Resources

About