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Summary: This study proposes a method for enhancing the THz chirality response of chiral amino acids by using a Pancharatnam-Berry (PB) metasurface. The method achieves the identification of chiral enantiomers of the same kind of amino acid.
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Summary: In this study, a set of dielectric metasurfaces are designed and fabricated to achieve efficient spin-multiplexed wavefront controls on THz waves based on high aspect-ratio silicon micropillars. Experimental demonstrations show a record high absolute efficiency of 92% for the photonic-spin-Hall-effect using a dielectric metasurface encoded with geometric phases only. Spin-multiplexed controls on circularly polarized THz beams, such as anomalous refraction and focusing, are also experimentally demonstrated with an efficiency of 88% using a dielectric meta-device encoded with both spin-independent resonant phases and spin-dependent geometric phases. This study paves the way for the realization of multifunctional, high-performance, and ultra-compact THz devices for applications in biology sensing, communications, and more.
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Zhechen Zhang et al.
Summary: Chiral recognition is a critical issue in the biomedical and pharmaceutical research fields. A power-free sensing platform based on bovine serum albumin (BSA) was proposed for sensitive chiral recognition of enantiomers. By measuring the output voltage, the enantioselectivity difference between L-Arg and D-Arg on a BSA-modified carbon substrate can be directly determined. The use of surface charges via the cyclization reaction between NO and O-phenylenediamine significantly enhances the sensitivity and specificity of enantioselective identification, with a limit of detection (LOD) as low as 76.0 nM. The flexible chips can function under deformation without sacrificing output performance, providing a new approach for the detection of chiral molecules and potential applications in wearable technology.
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Myonghoo Hwang et al.
Summary: The lithography-free fabrication of terahertz chiral metamaterials is achieved by combining two-step buckling processes and glancing-angle deposition. The manufactured chiral metamaterials exhibit mirror-shaped terahertz circular dichroism (TCD) signals in the range of 0.2-2.5 THz. The enhancement of sensing the chirality of biocrystal enantiomers is attributed to the synergistic effects of superchiral field enhancement and the electromagnetic resonance between the CHAMs and biocrystals.
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Optics
Weinan Shi et al.
Summary: Terahertz (THz) label-free and real-time metasurface-based biosensors have been widely studied, but distinguishing isomers in liquid samples remains challenging. In this study, a chiral selective bio-molecular film constructed on an anapole meta-surface sensor achieved the chiral recognition of amino acid enantiomers. The sensor provided a strong THz reflected signal in a water environment and showed high sensitivity and detection limit for L-Met and L-Phe. The binding abilities of bovine serum albumin (BSA) to D- and L-amino acids were different, and L-amino acids had a higher binding rate to the metasurface.
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Optics
Changzhi Zhong et al.
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Optics
Xuefei Ding et al.
Summary: This paper proposes an optimized multilayer structure for sensitive characterization of thin-film aqueous solutions. The best structure is found through theoretical simulations, and high sensitivity is achieved in glucose solution measurements. This work provides a new approach for THz thin-film characterization.
Article
Optics
Ying Cui et al.
Summary: This paper demonstrates giant and tunable polarization selectivity of circularly polarized light in transmission and reflection modes simultaneously using a photosensitive silicon-based zigzag metasurface. By performing multipole expansion and Jones matrix deduction, the physical mechanism of polarization selectivity is analyzed, and a dynamic chiral imaging utilizing the proposed structure is provided for experimental validation. The proposed meta-surface with high-efficiency circular polarization selectivity has profound implications for photonic integrated devices.
OPTICS AND LASER TECHNOLOGY
(2022)
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Optics
Wenen Liu et al.
Summary: In this study, an achiral nanorod was proposed to generate strong superchiral near-fields under linearly polarized incidence. The design of this achiral nanorod overcomes the challenge of large structural chirality in traditional chiral nanostructures, which may overshadow molecular chiral signals. The achiral platform was experimentally demonstrated for chiral molecule sensing.
Article
Chemistry, Analytical
Weinan Shi et al.
Summary: In this study, we developed a THz sensor that combines an all-dielectric metasurface with functionalized gold nanoparticles for immunosensing of target biomolecules. The sensor showed quantitative detection of HA antigen concentration and improved sensitivity with the functionalized Au NPs. Furthermore, the sensing method demonstrated specificity by selectively detecting only the HA antigen.
SENSORS AND ACTUATORS B-CHEMICAL
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Yumin Li et al.
Summary: This study developed a flexible THz MM biosensor for ultrasensitive detection of HBV in clinical serum samples. The biosensor achieved highly specific and sensitive detection of HBV DNA, with a limit of detection down to 1.27E + 02 IU/ml, using a gold magnetic nanoparticle-mediated rolling circle amplification sandwich assay.
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Optics
Zhonglei Shen et al.
Summary: A concise and general design principle is proposed to develop out-of-plane reflective chiral metasurfaces with maximum circular dichroism. The metasurfaces are fabricated using a simple and scalable three-dimensional printing technique. The experimental results validate the stability and strong chiroptical responses of the proposed metasurfaces. These findings have the potential to overcome the difficulties in design, optimization, and fabrication, and provide promising applications in emerging THz technologies.
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Lang Sun et al.
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Ziyang Zhang et al.
Summary: This study proposes a new THz sensing method based on THz reflective time-domain polarization spectroscopy system and chiral metasurface sensor, which improves sensitivity and detection accuracy for amino acid aqueous solutions. The sensing accuracies reach 10(-5) × 10(-4) g/mL, and D- and L- enantiomers with the same concentration can be distinguished.
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Kai Liu et al.
Summary: Enhancing EGFR detection technology is crucial for cancer diagnosis, and utilizing gold nanoparticles and EGFR antibodies can achieve high sensitivity detection of EGFR. In the proposed metamaterial biosensor, devices with larger GNP diameters can more effectively sense EGFR.
BIOMEDICAL OPTICS EXPRESS
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M. Amin et al.
Summary: A novel method utilizing the chirality of highly sensitive graphene plasmonic metasurfaces is proposed to characterize the complex refractive indexes of viruses by detecting the polarization state of the reflected electric fields in the THz spectrum. The method exploits chiral surface currents to couple linearly polarized incident fields to circularly polarized reflected fields, resulting in unique polarization states in the far-field with ellipticity values that change rapidly with the analyte's refractive index. The method demonstrates potential for virus characterization with simpler instrumentation compared to traditional spectroscopic methods.
Article
Spectroscopy
Meidie Hu et al.
Summary: The study utilized THz-based techniques to investigate the properties of tyrosine enantiomers, revealing similar but distinct absorption spectra for solid L-Tyr and D-Tyr compared to DL-Tyr. Interestingly, solutions of L-Tyr and D-Tyr showed no observable peaks, while a solution containing equal amounts of both enantiomers exhibited a similar spectrum to the DL-Tyr solution. Principal component analysis was used to confirm the differences between L-/D-Tyr and DL-Tyr.
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Yan Huang et al.
Summary: An ultrasensitive THz sensor composed of sub-wavelength bowtie black phosphorus and an annular gold ring is proposed, which generates a Fano-type resonance. By adjusting the geometry dimensions and Fermi level, a high FOM value and maximum sensitivity are achieved, making it suitable for biochemical nano-sensing applications based on Fano resonance at THz frequency.
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Fei Fan et al.
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