Direction‐Dependent Janus Metasurface Supported by Waveguide Structure with Spoof Surface Plasmon Polariton Modes

Abstract

The plasmonic absorbing structure driven by SSPPs has many advantages compared to the planar metamaterial absorber such as achieving customized absorption bandwidth and ultrawideband absorption. [17][18][19][20] Because of the merits of the SSPPs, various configurations based on hole arrays, slits, varactors, or blocks decorated on the metal surface, including the classic waveguide structure, are proposed for different applications. In SSPP modes, the strongly localized oscillation of free electrons can be efficiently trapped at the metalmedium interface. [21][22][23][24] Moreover, it bears mention that promising features of SSPPs in absorption applications have been exploited in several previous research outputs. [13,[25][26][27] For instance, in 2018, Yang et al. developed a non-planar plasmonic structure with a straight wire array as a cover on the absorber to achieve broadband absorption at high frequency and enhance the k-vector matching absorption by dispersion engineering of SSPPs. [28] In 2021, via the dispersion engineering of SSPPs, Zhu et al. designed an active absorptive frequency selective surface supported by a transmission-absorption integrated structure. [25] However, people usually pay attention to transmissionabsorption characteristics of the waveguide structure (WGS) under SSPP modes, and the directionality of EM waves is rarely dug. It can be observed that the overwhelming majority of researches related to metamaterials are confined to the case where EM waves are incident from one side, leaving half of the EM space unexplored. To enhance the capability of EM waves in full space, more original devices should be devised. And it is worth noting that in 2019, directional Janus metasurface (JM) was proposed by Chen et al. to achieve direction control, which increases the degree of freedom of EM waves control. [29] Furthermore, JMs have long been beguiled as a popular concept for breaking out-of-plane and in-plane structural symmetry. [29][30][31][32][33] In another example, Liu et al. raised cascaded chiral metamaterials for different polarization controls in oppositely propagating directions. [33] These works make full use of directional virtues in JM, promoting the flexibility and freedom of EM wave manipulation. On this point, a novel direction-dependent Janus Metasurface (DDJM) with the synergy of SSPP modes is proposed. Different from existing works, inspired by the previous

Fabrication and characterization of delay lines with spoof surface plasmon polariton waveguide coupled with C-shaped metamaterials for microwave integrated circuits

“…The phase difference between the ON and OFF devices is explained by the nonlinear dispersion relations of the sSPP waves propagating through the devices. 8,9,37) The simulated result using eigenfrequency analysis shown in Fig. 11(b) also indicates that the phase difference between the ON and OFF devices is caused by the dispersion relationship due to the existence of surface plasmon polaritons.…”

“…sSPP waveguide's working mechanism is based on the excitation of surface plasmon polaritons, which have many applications in the microwave range, such as power dividers, 2) frequency splitters, 3) antennas, 4) filters, 5) and potentially various applications in the terahertz range. [6][7][8][9] sSPP waveguide has been used for designing delay lines based on propagation constant variation. Mehmet Unlu et al demonstrated delay lines based on sSPP waveguide which have various phase differences by designing different corrugation depths for the microwave and terahertz range.…”

Broadband near unity absorption meta-structure for solar thermophotovoltaic systems and optical window applications

“…Zhong et al 47 proposed a three-layered meta-structure unit cell with a silver disk-shaped resonator layer that showed 80.4% average absorption in the range of 400 nm to 1500 nm. Guo et al 48 reported a direction-dependent Janus meta-surface (DDJM) with surface plasmon polariton (SSPP) modes. Over the frequency range of 0.8 THz to 1.2 THz, the proposed meta-surface achieves an average absorption of 90%.…”

Anti-reflection effect of high refractive index polyurethane with different light trapping structures on solar cells

“…For the light management of solar cells, the light trapping effects of different textured surfaces including nanocones [ 27 ], nanowires [ 28 ], and other structures, the plasmonic excitation effect of metal nanoparticles [ 29 ], and the light conversion properties of upconversion materials [ 30 ] can be simulated. Additionally, some other novel light trapping materials and theories are also expected to be applied to solar cells, such as graphene-embedded photonic crystals to realize ultrabroadband absorption [ 31 ], the use of gravitational field modulation to realize metamaterial absorbers [ 32 ] and the use of surface plasmon polariton to form novel waveguide structures [ 33 ].…”