Microwave birefringent metamaterials for polarization conversion based on spoof surface plasmon polariton modes

Abstract

We propose the design of wideband birefringent metamaterials based on spoof surface plasmon polaritons (SSPPs). Spatial k-dispersion design of SSPP modes in metamaterials is adopted to achieve high-efficiency transmission of electromagnetic waves through the metamaterial layer. By anisotropic design, the transmission phase accumulation in metamaterials can be independently modulated for x- and y-polarized components of incident waves. Since the dispersion curve of SSPPs is nonlinear, frequency-dependent phase differences can be obtained between the two orthogonal components of transmitted waves. As an example, we demonstrate a microwave birefringent metamaterials composed of fishbone structures. The full-polarization-state conversions on the zero-longitude line of Poincaré sphere can be fulfilled twice in 6–20 GHz for both linearly polarized (LP) and circularly polarized (CP) waves incidence. Besides, at a given frequency, the full-polarization-state conversion can be achieved by changing the polarization angle of the incident LP waves. Both the simulation and experiment results verify the high-efficiency polarization conversion functions of the birefringent metamaterial, including circular-to-circular, circular-to-linear(linear-to-circular), linear-to-linear polarization conversions.

microRNA‐95 knockdown inhibits epithelial–mesenchymal transition and cancer stem cell phenotype in gastric cancer cells through MAPK pathway by upregulating DUSP5

“…Finally, the 45 potential regulatory miRNAs of DUSP5 were found, among which miR‐95 was rarely reported in GC (Kurata & Lin, ). However, in other types of tumors, many studies have pointed out that miR‐95 expression was increased, while suggesting that it could promote tumor cell proliferation and other cellular behaviors (Chen, Chen, Hang, Huang, & Ma, ; Li, Y. et al, ; Qin, Teng, Zhu, Chen, & Wu, ). Analysis of the GSE93415 data set provided evidence suggesting that miR‐95 was also highly expressed in GC samples (Figure c).…”

Nanostructured Color Filters: A Review of Recent Developments

“…Metamaterials with subwavelength thickness, such as nanodisks, nano spheres, nanotubes and thin films, are capable of manipulating the wave front of impinging light by changing its phase [176], amplitude [177] or angle of polarization [178]. Its applications include: cloaking [179,180], polarization manipulation [181][182][183], high resolution lenses [184,185] and perfect absorbers [186]. The performance of metasurfaces as color filters have shown remarkable results; this section includes the reported work in this field.…”

Tailorable Switching of Transmission Modes between Waveguide and Spoof Surface Plasmon Polariton for Flexible and Dynamic Control of Phase Shift

“…Over recent decades, metamaterials, consisting of periodically orchestrated subwavelength-sized meta-atoms, have brought out outstanding performance to manipulate the wavefront of EM wave by generating phase discontinuities and specific distributions of amplitude. With the assistance of metamaterials, unprecedented physical effects are fulfilled, such as negative refractions and anomalous reflections, − polarization conversion, − and coupling of surface electromagnetic waves. , Furthermore, various metamaterial devices or systems underpin myriad of applications in flat lens, − beam controller, − absorbers and cloaks, − hologram imager, − etc. With high-performance and prominent capabilities, metamaterials provide a capacious platform for the expansion of the communication and detection field.…”