The scale mismatch between nanoscale biomolecules and sub-wavelength light hinders circular dichroism(CD)spectroscopy for chiral small molecule sensing.In this study,we propose a high quality-factor(Q-factor)optical c...The scale mismatch between nanoscale biomolecules and sub-wavelength light hinders circular dichroism(CD)spectroscopy for chiral small molecule sensing.In this study,we propose a high quality-factor(Q-factor)optical cavity that offers a breakthrough solution to the intrinsic trade-off between optical chirality density and mode loss.A spin-preserving chiral metasurface utilizes bound states in the continuum(BIC)-guided mode resonance(GMR)degenerate modes to achieve a high Q-factor,while ensuring the preservation of chirality purity for circularly polarized light propagating within the cavity via spin-locking mechanism.Experimental results demonstrate that the BIC-GMR degenerate state enables near-perfect transmission CD up to 0.99,without requiring symmetry breaking.Full-wave simulations further predict that this synergistically enhanced system can achieve a Q-factor as high as 10037 and generate a localized field in the molecular interaction region with an optical chirality density enhancement of up to 400-fold,leading to 5025-fold amplification of the CD signal.This study establishes a foundation for detecting low-concentration chiral molecules,reveals high-Q enhancement,and advances chiral toward single-molecule sensitivity,opening new research avenues in chiral biosensing.展开更多
High-performance microwave absorption(MA) materials must be studied immediately since electromagnetic pollution has become a problem that cannot be disregarded. A straightforward composite material, comprising hollow ...High-performance microwave absorption(MA) materials must be studied immediately since electromagnetic pollution has become a problem that cannot be disregarded. A straightforward composite material, comprising hollow MXene spheres loaded with C–Co frameworks, was prepared to develop multiwalled carbon nanotubes(MWCNTs). A high impedance and suitable morphology were guaranteed by the C–Co exoskeleton, the attenuation ability was provided by the MWCNTs endoskeleton, and the material performance was greatly enhanced by the layered core–shell structure. When the thickness was only 2.04 mm, the effective absorption bandwidth was 5.67 GHz, and the minimum reflection loss(RLmin) was-70.70 d B. At a thickness of 1.861 mm, the sample calcined at 700 ℃ had a RLmin of-63.25 d B. All samples performed well with a reduced filler ratio of 15 wt%. This paper provides a method for making lightweight core–shell composite MA materials with magnetoelectric synergy.展开更多
The enantiospecific detection of the chirality of substances at the nanoscale has attracted significant attention due to its importance in materials science,chemistry,and biology.This study presents,to our knowledge,a...The enantiospecific detection of the chirality of substances at the nanoscale has attracted significant attention due to its importance in materials science,chemistry,and biology.This study presents,to our knowledge,a novel method for chirality detection based on transverse optical torque(OT),which leverages the transverse rotation of achiral particles induced by the transfer of chirality from the chiral particle within interference fields formed by the incident light without spin angular momentum(SAM).We demonstrate,both numerically and analytically,that by modulating the chirality of the chiral particle within a dimer system,it is possible to achieve the transfer of local SAM to the gold particle,thereby generating a transverse OT perpendicular to the light propagation direction.Furthermore,by adjusting the orientation of linear polarization in the excitation field,the respective contributions of electric and magnetic responses to the chirality-transfer-induced transverse OT can be exclusively observed separately,providing deeper insights into the underlying physical mechanisms.More importantly,the transverse OT exhibits an approximately linear dependence on the chirality parameter of the chiral particle,enabling enantiospecific detection of nanosamples.By replacing gold nanoparticles with suitable highrefractive-index dielectric materials such as germanium,the induced transverse magnetic dipolar OT can be further enhanced by more than two orders of magnitude,significantly improving the sensitivity of chirality detection and making it possible to detect weak chiral signals with exceptional precision.This work broadens the application scope of OTs in chirality detection and highlights the potential of chirality transfer mechanisms for advanced optical manipulation and the identification and analysis of chiral substances.展开更多
Spatiotemporal optical vortices(STOVs)are distinguished by their intricate phase structures and orbital angular momentum properties.This study demonstrates a coherent 4Pi-focused method generating STOV arrays by tight...Spatiotemporal optical vortices(STOVs)are distinguished by their intricate phase structures and orbital angular momentum properties.This study demonstrates a coherent 4Pi-focused method generating STOV arrays by tightly focusing the wave packets carrying spatiotemporal vortices and an additional spatial vortex.Numerical simulations reveal that the structural characteristics of the STOV array are governed by the interplay between the spatiotemporal and spatial topological charges of the incident wave packet.Notably,the introduction of spin angular momentum into the wave packet induces spin-orbit coupling,resulting in a distinctive tilt of the STOV array.These findings open potential pathways for high-dimensional optical manipulation and advanced optical information multiplexing.展开更多
基金financially supported by the POSCO-POSTECH-RIST Convergence Research Center program funded by POSCOthe National Research Foundation (NRF) grant (RS-2024-00462912) funded by the Ministry of Science and ICT (MSIT) of the Korean government+4 种基金partially supported by National Natural Science Foundation of China (Nos. 12274074, 12134013)Natural Science Foundation of Jiangsu Province (BK20242024)China Scholarship Council (202406090137)Postgraduate Research & Practice Innovation Program of Jiangsu Province (KYCX24_0379)the NRF Ph.D. fellowship (RS-202525437554) funded by the Ministry of Education (MOE) of the Korean government
文摘The scale mismatch between nanoscale biomolecules and sub-wavelength light hinders circular dichroism(CD)spectroscopy for chiral small molecule sensing.In this study,we propose a high quality-factor(Q-factor)optical cavity that offers a breakthrough solution to the intrinsic trade-off between optical chirality density and mode loss.A spin-preserving chiral metasurface utilizes bound states in the continuum(BIC)-guided mode resonance(GMR)degenerate modes to achieve a high Q-factor,while ensuring the preservation of chirality purity for circularly polarized light propagating within the cavity via spin-locking mechanism.Experimental results demonstrate that the BIC-GMR degenerate state enables near-perfect transmission CD up to 0.99,without requiring symmetry breaking.Full-wave simulations further predict that this synergistically enhanced system can achieve a Q-factor as high as 10037 and generate a localized field in the molecular interaction region with an optical chirality density enhancement of up to 400-fold,leading to 5025-fold amplification of the CD signal.This study establishes a foundation for detecting low-concentration chiral molecules,reveals high-Q enhancement,and advances chiral toward single-molecule sensitivity,opening new research avenues in chiral biosensing.
基金This work was financially supported by the National Natural Science Foundation of China(52130510,62071120,52075097,52205454,52375413)the Natural Science Foundation of Jiangsu Province(BE2022066,BZ2023043,BK20202006,BK20211562)Science and Technology Program of Suzhou,Jiangsu Province,China(SYG202302).
文摘High-performance microwave absorption(MA) materials must be studied immediately since electromagnetic pollution has become a problem that cannot be disregarded. A straightforward composite material, comprising hollow MXene spheres loaded with C–Co frameworks, was prepared to develop multiwalled carbon nanotubes(MWCNTs). A high impedance and suitable morphology were guaranteed by the C–Co exoskeleton, the attenuation ability was provided by the MWCNTs endoskeleton, and the material performance was greatly enhanced by the layered core–shell structure. When the thickness was only 2.04 mm, the effective absorption bandwidth was 5.67 GHz, and the minimum reflection loss(RLmin) was-70.70 d B. At a thickness of 1.861 mm, the sample calcined at 700 ℃ had a RLmin of-63.25 d B. All samples performed well with a reduced filler ratio of 15 wt%. This paper provides a method for making lightweight core–shell composite MA materials with magnetoelectric synergy.
基金National Natural Science Foundation of China(12274074,12134013,12174076)Natural Science Foundation of Jiangsu Province(BK20242024)+1 种基金Natural Science Foundation of Guangxi(2023GXNSFFA026002)Postgraduate Research&Practice Innovation Program of Jiangsu Province(KYCX24_0381)。
文摘The enantiospecific detection of the chirality of substances at the nanoscale has attracted significant attention due to its importance in materials science,chemistry,and biology.This study presents,to our knowledge,a novel method for chirality detection based on transverse optical torque(OT),which leverages the transverse rotation of achiral particles induced by the transfer of chirality from the chiral particle within interference fields formed by the incident light without spin angular momentum(SAM).We demonstrate,both numerically and analytically,that by modulating the chirality of the chiral particle within a dimer system,it is possible to achieve the transfer of local SAM to the gold particle,thereby generating a transverse OT perpendicular to the light propagation direction.Furthermore,by adjusting the orientation of linear polarization in the excitation field,the respective contributions of electric and magnetic responses to the chirality-transfer-induced transverse OT can be exclusively observed separately,providing deeper insights into the underlying physical mechanisms.More importantly,the transverse OT exhibits an approximately linear dependence on the chirality parameter of the chiral particle,enabling enantiospecific detection of nanosamples.By replacing gold nanoparticles with suitable highrefractive-index dielectric materials such as germanium,the induced transverse magnetic dipolar OT can be further enhanced by more than two orders of magnitude,significantly improving the sensitivity of chirality detection and making it possible to detect weak chiral signals with exceptional precision.This work broadens the application scope of OTs in chirality detection and highlights the potential of chirality transfer mechanisms for advanced optical manipulation and the identification and analysis of chiral substances.
基金supported by the National Natural Science Foundation of China(Nos.12274074 and 12134013)the Natural Science Foundation of Jiangsu Province(No.BK20242024)the Postgraduate Research&Practice Innovation Program of Jiangsu Province(No.KYCX25_0437)。
文摘Spatiotemporal optical vortices(STOVs)are distinguished by their intricate phase structures and orbital angular momentum properties.This study demonstrates a coherent 4Pi-focused method generating STOV arrays by tightly focusing the wave packets carrying spatiotemporal vortices and an additional spatial vortex.Numerical simulations reveal that the structural characteristics of the STOV array are governed by the interplay between the spatiotemporal and spatial topological charges of the incident wave packet.Notably,the introduction of spin angular momentum into the wave packet induces spin-orbit coupling,resulting in a distinctive tilt of the STOV array.These findings open potential pathways for high-dimensional optical manipulation and advanced optical information multiplexing.
