Properties of obliquely incident electromagnetic wave in one-dimensional (1D) magnetized plasma photonic crystals (PPCs) are studied this paper. Based on the continuous boundary condition 1D PPC, transfer matrix equation and dispersion transverse magnetic polarization deduced, properties transmission relation terms external field, collision frequency, dielectric constant angles investigated, respectively. Results show that gap location width can be effectively controlled by adjusting field...

The real-time and label-free terahertz (THz) metamaterial (MM) sensor is proposed to distinguish the normal concentration of glucose from abnormal based on THz time-domain spectroscopy (TDS) technology. physical mechanism biosensing performance verified theoretically experimentally. designed composed a couple asymmetric thick metals silicon dioxide substrate exhibits two transmission dips at 0.26 0.4 in region 0.1 0.5 THz, respectively. Four samples with concentrations 4 mmol/L 10 step 2 are...

Spinning thermal radiation is a unique phenomenon observed in condensed astronomical objects, including the Wolf-Rayet star EZ-CMa and red degenerate G99-47, due to existence of strong magnetic fields. Here, by designing symmetry-broken metasurfaces, we demonstrate that spinning with nonvanishing optical helicity can be realized even without applying field. We design engineering dispersionless band emits omnidirectional radiation, where our reaches 39% fundamental limit. Our results firmly...

Properties of one-dimensional graphene photonic crystals with dual-layer defects are studied. Results show that two defect modes appear within the gaps, and shift to lower frequencies chemical potential increasing, physical mechanism also given based on relative dielectric constant graphene. It is found frequency, magnitude, numbers can vary symmetrical changes dual-defect layers. For oblique incidence, TE polarization follow a similar trend TM polarization, all higher disappear while new at...

In this paper, a new type of broadband tunable metamaterial absorber is proposed. The structure consists single-layer ring graphene and metal ground plane separated by dielectric spacer. rings are connected each other to be easily tuned the voltage. addition, polarization-independent at normal incidence due symmetric pattern unit cell. Results reveal bandwidth 90% absorption reaches 2.25 THz for single-ring structure. increases 3.2 combining two similar with different sizes in one physical...

Two types of broadband and polarization independent graphene metamaterial absorbers are designed. One is a composite four-ring structure with azimuthally symmetry, the other nested multi-ring structure. The more compact has broader band absorption. bandwidth over 90% absorption 7.1 THz for increases to 8.7 11.9 dual-ring three-ring absorber, respectively. wide owe combination symmetric multi-resonators different sizes in unit cell. Physical mechanisms given by impedance matching theory as...

In this communication, a rectangular dielectric resonator antenna (DRA) is integrated with backed cavity to enlarge the DRA side length by 1.8 times. The also reduces sensitivity of resonance size, resulting in relaxed fabrication tolerance. Based on enlarged design, stacked (sDRA) proposed improve bandwidth from 8.7% 15% and enhance realized gain an average 1.5 dB. mechanisms are verified fabricating <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML"...

In this article, we experimentally demonstrate a bifunctional terahertz (THz) metasurface that can achieve broadband linear-to-circular polarization conversion (LCPC) and linear (LPC) in two different bands, respectively. The measured 3-dB axial ratio relative bandwidth is 34.2% for the LCPC lower band from 0.34 to 0.48 THz, over 80% LPC higher 0.53 0.85 THz. physical mechanism of explained by surface current distribution further discussed employing multiple interference model. This THz...

Dispersion characteristics of two types two-dimension dielectric plasma photonic crystal are studied based on modified plane wave method. Firstly, the eigenvalue equations TM mode type-1 and type-2 structures derived respectively; their dispersion curves confirmed by software simulation. Secondly, influences normalized frequency, filling factor relative constant band gap, gap width analyzed respectively, some corresponding physical explanations also given. These results would provide...

By using transfer matrix method, properties of one-dimensional magnetized plasma photonic crystals with a dielectric defect layer are studied. Results show that several modes appear within the band gaps; periodic number and collision frequency only affect transmission magnitude modes; external magnetic field incident angle control both thickness constant determine modes. This phenomenon may be useful in designing narrow filters or multi-channel filters.

By using modified plane wave method, photonic band structures of the transverse electric polarization for two types two-dimensional magnetized plasma crystals are obtained, and influences external magnetic field, density, dielectric materials on dispersion curves studied, respectively. Results show that areas flat bands appear in due to role higher frequencies up down corresponding right-circled left-circled cutoff frequencies, Adjusting field density can not only control positions bands,...

A broadband terahertz metamaterial filter and its complementary metasurface-electromagnetically induced transparency structure are designed, fabricated demonstrated. The proposed is a single-layer metal-dielectric structure, which easier to fabricate control compared with the multi-layer structures reported before. 3 dB relative bandwidth of 27% center frequency 0.405 THz. By changing metal pattern into polarization independent electromagnetically (EIT) formed transmission peak appearing at...

A dual-resonance frequency selective surface filter in the THz range that uses bilayer modified complementary metamaterial structures is proposed this Letter. The bandpass filter, with dual bands centered at 0.315 and 0.48 THz, a single crystal quartz substrate simulated, fabricated, measured. To minimize manufacturing risks of working fragile thin substrates, efforts have been made to improve transmission response features realizable thicknesses. Experimental results from 0.1 0.6 measured...

We propose an ultrathin fish-scale metamaterial structure for broadband absorption with averaged value of higher than 90% over the entire visible spectrum (400-700 nm) under normal incidence. The performance preserves a wide range incident angle from 0° to 60°. Light such plasmonic absorber (PMA) relies on localized and delocalized surface plasmon resonances cascaded meta-atoms in structure. PMA presents excellent structural tunability band. This study rich finding is helpful light...

The complex band structures of a 1D anisotropic graphene photonic crystal are investigated, and the dispersion relations confirmed using transfer matrix method simulation commercial software. It is found that result effective medium theory can fit derived curves in low wave vector. Transmission, absorption, reflection at oblique incident angles studied for structure, respectively. Omni-gaps exist as high 80° two polarizations. Physical mechanisms tunable transmission explained by...

We proposed a multifunctional terahertz metasurface based on double L-shaped pattern and vanadium dioxide (VO2) film separated by polyimide. When the VO2 is an insulator, dual-band electromagnetically induced transparency effect obtained, physical mechanism investigated current distribution "two-particle" model. metal, linear-to-circular polarization converter, in which y-polarized linear wave can be effectively converted to left-handed circularly polarized (LCP) right-handed simultaneously...

We propose a broadband perfect metamaterial absorber (MA) working at the terahertz (THz) frequencies based on rectangular fish-scale structure. The averaged absorption of MA is higher than 85% from about 0.85 to 1.95 THz with maximum value 99.5% normal incidence. broad and high can also be obtained for large oblique incidence ±70°. mixtures electric magnetic resonances contribute excellent performance MA. Furthermore, this independent polarization states incident electromagnetic (EM) waves...

Properties of electromagnetic waves with normal and oblique incidence have been studied for one-dimensional plasma layers sinusoidal densities. Wave transmittance as a function wave frequency exhibits photonic band gaps characteristic crystals. For periodic structures, increasing collision is demonstrated to lead greater absorption, the modulation factor enlarges gap width, angle can change locations two polarizations. If defect layer introduced by inserting new in center, mode may appear...

A triple-broadband infrared metamaterial absorber with polarization-independent and wide-angle absorption is proposed by a combination of three different configurations. The each band exceeds 80% in the frequency ranges 142–159 THz, 183–200 THz 233–245 THz. 3dB relative bandwidths are 14.5%, 13.1% 9.9%, respectively. Based on impedance matching theory, impedances calculated match to those free space regions. To better understand physical mechanism broadband absorption, electric field surface...

The reported dual-band asymmetric transmission is usually an effect of mutual polarization conversion, where one polarized wave converted to its cross-polarization in the first band while other second band. In this work, we experimentally demonstrate a only for one-polarized linear terahertz It measured that coefficient T yx reaches two peaks 0.715 and 0.548 at frequency 0.74 THz 1.22 THz, respectively. While xy lower than 0.2 wide-band from 0.5 1.5 THz. Firstly, multiple interference model...