Mid-infrared giant optical chirality induced by multipole degeneracy in diamond metasurface

Optics Letters, Год журнала: 2025, Номер 50(4), С. 1381 - 1381

Опубликована: Фев. 3, 2025

Optical chirality is a fundamental property of light that plays crucial role in chiroptical spectroscopy, analytical chemistry, spin photonics, and astrobiology. However, giant optical at the wavelength beyond 15 μm remains untapped, which hinders its various applications, such as ultrasensitive vibrational circular dichroism, mid-infrared region. Here we propose theoretically present with a, to our knowledge, record-high value ∼330 diamond metasurface. This enabled by tailoring multipole degeneracy leveraging low loss work provides new method for boosting μm.

Язык: Английский

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Terahertz molecular vibrational sensing using anapole mode-based meta-biosensor

Biosensors and Bioelectronics, Год журнала: 2025, Номер 278, С. 117351 - 117351

Опубликована: Март 7, 2025

Язык: Английский

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Vibrational circular dichroism of plasmonic nanostructures embedding chiral drugs

Scientific Reports, Год журнала: 2025, Номер 15(1)

Опубликована: Апрель 16, 2025

We investigate the mid-infrared chiroptical response of plasmonic nanostructures based on Al-doped ZnO and layers an aqueous solution Ladarixin, a chiral pharmaceutical currently under clinical trial for treatment type 1 diabetes. explore possibilities offered by localised surface plasmon resonances (LSPRs) enhancement vibrational circular dichroism (VCD) considered drug solution. Focusing diverse nanoshell geometries, we find that LSPRs provide amplification factor VCD differential absorption cross-section ranging from [Formula: see text] to thanks near-field intensity produced LSPRs. Our results indicate are promising probing molecular chirality at nanoscale.

Язык: Английский

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Near‐Field Coupling Induced Less Chiral Responses in Chiral Metamaterials for Surface‐Enhanced Vibrational Circular Dichroism

Advanced Functional Materials, Год журнала: 2023, Номер 34(13)

Опубликована: Дек. 18, 2023

Abstract Chiral metamaterials play vital roles in manipulating the circular polarization of electromagnetic waves. Although planar chiral are believed to have no true/intrinsic chirality, design structural anisotropy can still create enormous dichroism, while mechanism is fully explored. Here, for first time, it observed that strong near‐field coupling induces less response metamaterials. Selective exposure methods manipulate strength, and experimentally validate dichroism difference from tailored effect leveraged, which provides evidence assumption be utilized framework. Besides, using enhanced (over 750‐fold), surface‐enhanced vibrational (SEVCD) glucose enantiomers, shows a larger‐than‐one normalized sensitivity compared with demonstrated. Furthermore, The potential SEVCD by detecting broadband signal arrayed These findings pave way toward chiroptical nanophotonic designs biomedical healthcare applications.

Язык: Английский

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Unlocking Insights into Folding, Structure, and Function of Proteins through Circular Dichroism Spectroscopy—A Short Review

Applied Biosciences, Год журнала: 2023, Номер 2(4), С. 639 - 655

Опубликована: Ноя. 24, 2023

Circular dichroism (CD) spectroscopy has emerged as a powerful tool in the study of protein folding, structure, and function. This review explores versatile applications CD unraveling intricate relationship between conformation biological activity. A key advantage is its ability to analyze samples with minimal quantity requirements, making it an attractive technique for studying proteins that are scarce or difficult produce. Moreover, enables monitoring physical chemical environmental effects on structures, providing valuable insights into dynamic behavior different conditions. In recent years, use synchrotron radiation light source measurements gained traction, offering enhanced sensitivity resolution. By combining advantages spectroscopy, such sample requirements probe effects, emerging capabilities (SRCD), researchers have unprecedented opportunity explore diverse aspects behavior. highlights significance research growing role advancing our understanding behavior, aiming provide novel various fields, including drug discovery, engineering, biotechnology. brief overview Solid-State Dichroism (SSCD) also included.

Язык: Английский

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Tailoring Light–Matter Interactions in Overcoupled Resonator for Biomolecule Recognition and Detection

Nano-Micro Letters, Год журнала: 2024, Номер 17(1)

Опубликована: Сен. 26, 2024

Abstract Plasmonic nanoantennas provide unique opportunities for precise control of light–matter coupling in surface-enhanced infrared absorption (SEIRA) spectroscopy, but most the resonant systems realized so far suffer from obstacles low sensitivity, narrow bandwidth, and asymmetric Fano resonance perturbations. Here, we demonstrated an overcoupled resonator with a high plasmon-molecule coefficient (μ) (OC-Hμ resonator) by precisely controlling radiation loss channel, resonator-oscillator frequency detuning channel. We observed strong dependence sensing performance on state, that OC-Hμ has excellent properties ultra-sensitive (7.25% nm −1 ), ultra-broadband (3–10 μm), immune lineshapes. These characteristics represent breakthrough SEIRA technology lay foundation specific recognition biomolecules, trace detection, protein secondary structure analysis using single array (array size is 100 × µm 2 ). In addition, assistance machine learning, mixture classification, concentration prediction spectral reconstruction were achieved highest accuracy 100%. Finally, potential SARS-CoV-2 detection. findings will promote wider application technology, while providing new ideas other enhanced spectroscopy technologies, quantum photonics studying interactions.

Язык: Английский

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Deep‐Learning Empowered Customized Chiral Metasurface for Calibration‐Free Biosensing

Advanced Materials, Год журнала: 2024, Номер unknown

Опубликована: Окт. 27, 2024

Abstract As a 2D metamaterial, metasurfaces offer an unprecedented avenue to facilitate light‐matter interactions. The current “one‐by‐one design” method is hindered by time‐consuming, repeated testing within confined space. However, intelligent design strategies for metasurfaces, limited data‐driven properties, have rarely been explored. To address this gap, data iterative strategy based on deep learning, coupled with global optimization network proposed, achieve the customized of chiral metasurfaces. This methodology applied precisely identify different molecules in label‐free manner. Fundamentally from traditional approach collecting purely through simulation, proposed generation encompasses entire space, which inaccessible conventional methods. dataset quality significantly improved, 21‐fold increase number structures exhibiting desired circular dichroism (CD) response (>0.6). method's efficacy validated monolayer structure that easily prepared, demonstrating advanced sensing abilities enantiomer‐specific analysis bio‐samples. These results demonstrate superior capability schemes photonic and potential metasurface‐based platforms calibration‐free biosensing applications. will accelerate development complex systems rapid molecular detection, spectroscopic imaging, other

Язык: Английский

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Deep-learning based design and modeling for chiro-optical dielectric metasurfaces

Опубликована: Окт. 13, 2023

Nanophotonics employ chiro-optical effects for a variety of applications, including advanced imaging and molecular detection separation. Due to their outstanding qualities in light-matter interactions, planar metasurfaces comprised subwavelength meta-atoms have attracted lot attention. Despite the vast potential metasurfaces, achievement large compactly on-chip at visible wavelengths is still hindered by its complex design optimization procedure. Deep-learning (DL) based modelling techniques been put out as an alternative time-consuming computationally demanding traditional procedure during past few years. In this work, we employed deep-learning forward inverse models optimize achiral nano-fins achieve giant affects wavelengths. A regression neural network proposed, that takes all structural dimensions input trained separately predict three different types asymmetric transmissions i.e., TLL, TLR TRL circular dichroism. An model also demonstrated simultaneously considers target optimizes such way they experience constructive destructive interference, resulting average dichroism more than 60% 70% transmission. With applications chiral polarizers optical displays, flat integrated polarization shifter's exhibiting high efficiency, chiral-metasurface sensors beam splitters, suggested DL-enabled ease realization op-chip response through metasurface.

Язык: Английский

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Recent progresses and applications on chiroptical metamaterials : a review

Journal of Physics D Applied Physics, Год журнала: 2024, Номер 57(49), С. 493004 - 493004

Опубликована: Авг. 14, 2024

Abstract Chiroptical metamaterials have attracted considerable attention owing to their exciting opportunities for fundamental research and practical applications over the past 20 years. Through designs, chiroptical response of chiral can be several orders magnitude higher than that natural materials. therefore represent a special type artificial structures unique activities. In this review, we present comprehensive overview progresses in development metamaterials. metamaterial progress enables applications, including asymmetric transmission, polarization conversion, absorber, imaging, sensor emission. We also review fabrication techniques design based on deep learning. conclusion, possible further directions field.

Язык: Английский

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Structural, morphological, optical, electrical, and magnetic properties of aluminum-doped CoxCa(0.90−x)Ni0.10Fe2O4 flexible substrate for visible to NIR spectra applications

APL Materials, Год журнала: 2024, Номер 12(5)

Опубликована: Май 1, 2024

This paper presents a conductive component tailored to flexible substrate using Al-doped CoxCa(0.90−x)Ni0.10Fe2O4 (x = 0.25, 0.50, and 0.75) for visible near-infrared (NIR) spectra in magneto-optical applications. The developed nanoparticles show uniformity, nanosized grains, capillary nanopore fusion characteristics, which are confirmed by x-ray diffraction (XRD), field emission scanning electron microscopy, energy-dispersive spectroscopy analyses, respectively. XRD analysis revealed crystallite sizes of 33.36, 37.08, 44.25 nm particle 45.6, 34.6, 31.5 the compositions x 0.75, converted solid utilizing polyvinyl alcohol matrix, facilitating conformality build complex shapes broadening their application scope. structure shows higher absorption across 450–720 nm, 480–720 200–850 distinctive magnetic electrical properties also evaluated through force microscopy atomic culminating with exceptional control over light–matter interactions smooth surfaces lower surface roughness. vibrating sample magnetometer how varying cobalt content affects relevant applications, offering insights into coercivity, magnetization, retentivity changes at different values. perceptible novelties this work advancements material sciences aimed enhancing light manipulation flexibility electronic devices.

Язык: Английский

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