At present, the deactivation of selective catalytic reduction (SCR) catalysts caused by coexistence alkali metal and phosphorus (P) remains an urgent problem lacks corresponding strategies against catalyst poisoning. Herein, a novel zeolite-like Ce–Si5Al2Ox derived from ultrasmall nanozeolite EMT precursor was synthesized without organic templates at ambient temperature. This able to maintain above 95% NOx conversion in 270–540 °C temperature range. Moreover, 1 wt % potassium (K) 5 P loading...

Iron sulfide nanoparticles (nano-FeS) have shown great potential for in situ remediation of Cr(VI) pollution by reducing to the less soluble and toxic Cr(III). However, material oxidation that inevitably occurs during storage application alters its reactivity. Herein, we show partial nanoparticulate mackinawite (FeS) significantly enhances capability sequestering Cr(VI). Oxidation nano-FeS increases binding affinity Cr(VI), likely due preferential inner-sphere complexation oxyanions ferric...

A dielectric metasurface with line-square compound lattice structure has been fabricated and demonstrated in the terahertz (THz) regime by THz time-domain spectroscopy numerical simulation. polarization dependent electromagnetically induced transparency (EIT) effect is achieved this due to mode coupling interference between resonance modes line square subunits of metasurface. Accompany EIT effect, a large artificial birefringence two orthogonal states also observed metasurface, which over...

To enhance and actively control terahertz (THz) anisotropy chirality, we have designed fabricated a THz composite device with liquid crystal (LC) layer Si anisotropic metasurface. By initial anchoring electrically rotating the spatial orientation of LC optical axis, different symmetry relationships are obtained in this hybrid device. When axis is parallel or perpendicular to metasurface, will be enhanced offset, which leads tunable phase-shift range more than 180°. there an angle between two...

Abstract Manipulating terahertz (THz) polarization in an efficient and broadband manner is of great significance to facilitating THz applications, including communications, imaging, defense, homeland security. In this work, a dispersion compensation scheme proposed for high‐efficiency ultra‐broadband manipulation using anisotropic dielectric‐metal hybrid metadevice. The operating bandwidth broadened by compensation, where the dielectric grating provides artificial birefringence with phase...

Abstract Vortex‐vector beam generators can effectively improve the channel capacity and communication accuracy, but they face problems of narrow operating frequency band, low efficiency, fixed function. Here, a terahertz liquid crystal cascaded metadevice is demonstrated, including layer, an asymmetric metasurface helical phase layer. The combination crystal's anisotropy structural from realizes dynamic chirality construction. Then, tunable chiral fields are coupled with geometric last layer...

The transverse magneto-optical (MO) effect of InSb has been theoretically and experimentally investigated in the terahertz (THz) regime. calculated photonic band structure experimental measurements show that a unique circularly polarized magneto plasmon mode, linearly magnetic mode can be sensitively manipulated by weak field. Moreover, these results indicate magnetized used as THz tunable high-pass filter MO modulator. cutoff frequency broadly tuned from 0.4 to 0.8 when field changes 0 0.22...

Ferromagnetic liquid crystals (FLCs), the suspensions of magnetic nanoparticles dispersed at different concentrations in (LCs), and their special magnetically induced birefringence characteristics have been investigated terahertz regime, mainly focusing on interaction between cluster chains LC molecules. We experimentally demonstrated surface anchoring effect molecules a mm-thick cell under an extremely weak external field (EMF), leading to uniform arrangement over entire cell. Unlike pure...

Growing evidence has suggested that microbial biofilms are potential environmental "hotspots" for the production and accumulation of a bioaccumulative neurotoxin, methylmercury. Here, we demonstrate extracellular polymeric substances (EPS), main components biofilm matrices, significantly interfere with mercury sulfide precipitation lead to formation nanoparticulate metacinnabar available methylation, natural process predominantly responsible occurrence EPS derived from methylating bacteria,...

Abstract Active manipulation of photonic spin state and optical chirality leads to some key applications, such as in multichannel communication, polarization‐sensitive imaging, chiral spectroscopy, sensing. Magneto‐optical materials have unique advantages the intrinsic transmission magnetic control states. Here, a scheme for dynamic terahertz (THz) anisotropy manipulations transversely magnetized InSb its hybrid magneto‐optical metasurface structure is presented. A special transverse...

Surface plasmons have been given high expectations in terahertz (THz) on-chip photonics with highly bound integrated transmission and wavefront engineering. However, most surface plasmonic coupling strategies tailorable polarization-dependent features are challenged broadband propagation dynamic manipulation. In this work, a liquid crystal (LC)-integrated metadevice based on arc-arrayed pair-slit resonators (APSRs) is demonstrated. The mirror-symmetry structures of achieve the spin-selective...

Arsenic is a pervasive environmental pollutant that can bioaccumulate in Antarctic krill through the food chain, posing potential risks to human health. This study investigates toxic effects of arsenic oil (AKO) on Caco-2 cells, focusing oxidative stress and apoptosis induction. AKO nutrient-rich contains various species, including arsenite (As³⁺), arsenate (As⁵⁺), dimethyl arsinic acid (DMA), arsenobetaine (AsB), each exhibiting different potencies. cells were treated with standards assess...

Abstract The field of optical chirality has achieved remarkable progress with the quick development artificial metasurfaces. introduction quasi‐bound states in continuum (QBIC) into chiral devices offers a groundbreaking and efficient method for modulating responses. However, existing QBIC‐based research primarily concentrates on dielectric structures also encounters challenges such as complex design requirements limitations to single‐frequency band operation. In this work, metallic...

Abstract Optical coherence with high precision and sensitivity holds achievements in communication, metrology, sensing. The optical vernier effect generated by the dual‐comb interference highlights technology to heighten accuracy sensitivity, particularly visible infrared bands. However, maturity frequency domain of may overshadow its attributes time domain, which are limited enhancing comprehensive performance. This work provides a lag compensation that enables hyperfine spectrum...

Abstract Vortex beams with orbital angular momentum (OAM) exhibit immense potential in various fields such as communications, information processing, and optical tweezers. Nevertheless, current terahertz vortex beam generators still face challenges including narrow frequency bands, low efficiency, limited multiplexing capabilities, difficulties dynamic tuning. Here, the study introduces a new electrically controlled multi‐channel strategy that harnesses cascaded helical geometric...

Developing the broadband controllable or tunable terahertz (THz) polarization and phase devices are in an urgent need. In this paper, we demonstrate a THz quarter-wave plate (QWP) with double layers of graphene grating layer liquid crystals. The gratings can achieve switchable QWP to switch between linear-to-linear linear-to-circular states over 0.35THz bandwidth ON OFF state by applying biased electric field on not. Moreover, based structure periodic gradient significantly enhance...

We experimentally demonstrate an active terahertz (THz) resonance switch induced by the polarization conversion in a compound metasurface, which is LC layer sandwiched metallic wire grating and metamaterial (LCGM). Here, liquid crystal (LC) plays role of conversion, can induce TE resonance. Moreover, there exists localized between layers, then excited will be greatly enhanced. The results show that high extinction ratio exceeds 30 dB at 0.82 THz. This work bring new ideas for research...

Dynamic control of photonic spin state and chirality plays a vital role in various applications, such as polarization control, polarization-sensitive imaging, biosensing. Here, we present scheme for the flexible dynamic manipulation terahertz conversion optical by combining two achiral structures: an asymmetric metasurface layer anisotropic liquid crystal. The proposed can realize effect. For circularly polarized incidence, it exhibits transmission spin-flipped states but no spin-locked...

Active terahertz (THz) beam manipulation is urgently needed for applications in wireless communication, radar detection, and remote sensing. In this work, we demonstrate a liquid crystal (LC) integrated Pancharatnam–Berry (PB) metadevice active THz manipulation. Through theoretical analysis simulation design, the geometric phase of PB metasurface engineered to match tunable anisotropic shift LCs under an external magnetic field, dynamic deflection accompanied by spin conversion obtained. The...