Topological photonics provides a new opportunity for the examination of novel topological properties of matter,in which the energy band theory and ideas in topology are utilized to manipulate the propagation of photon...Topological photonics provides a new opportunity for the examination of novel topological properties of matter,in which the energy band theory and ideas in topology are utilized to manipulate the propagation of photons.Since the discovery of topological insulators in condensed matter,researchers have studied similar topological effects in photonics.Topological photonics can lead to materials that support the robust unidirectional propagation of light without back reflections.This ideal transport property is unprecedented in traditional optics and may lead to radical changes in integrated optical devices.In this review,we present the exciting developments of topological photonics and focus on several prominent milestones of topological phases in photonics,such as topological insulators,topological semimetals,and higher-order topological phases.We conclude with the prospect of novel topological effects and their applications in topological photonics.展开更多
Terahertz （THz） technology promises important applications including imaging, spectroscopy, and communications. However, one of limitations at present for advancing THz applications is the lack of efficient devices ...Terahertz （THz） technology promises important applications including imaging, spectroscopy, and communications. However, one of limitations at present for advancing THz applications is the lack of efficient devices to manipulate THz waves. Here, our recent important progresses in THz functional devices based on artificial microstructures, such as photonic crystal, metamaterial, and plasmonic structures, have been reviewed in this paper, involving the THz modulator, isolator, and sensor. These THz microstructure functional devices exhibit great promising potential in THz application systems.展开更多
Terahertz(THz)waves exhibit distinctive properties,such as high transmittance,pronounced absorption,and minimal photon energy,enabling a wide range of applications in biomedical diagnosis,non-destructive testing,and q...Terahertz(THz)waves exhibit distinctive properties,such as high transmittance,pronounced absorption,and minimal photon energy,enabling a wide range of applications in biomedical diagnosis,non-destructive testing,and quality/safety monitoring of food and agricultural products.Consequently,THz-based sensors have garnered increasing attention.However,the design of traditional coupling structures fails to effectively match the high-frequency oscillation of THz waves,resulting in low signal energy transmission efficiency and limiting the performance of THz sensors,while microstructure technology can offer a solution by achieving localized enhancement of the electromagnetic field energy through precise matching of sub-wavelength resonance units with the high-frequency oscillation of THz waves,which significantly improves the sensitivity of THz sensors.This review summarizes the basic principles and research status of various THz sensors based on different microstructures,such as split-ring resonators(SRRs),photonic crystals,waveguide resonators,and surface plasmon resonance.Notably,the rapid development of artificial intelligence,especially deep learning,is increasingly influencing THz sensing technologies with its strengths in signal processing,pattern recognition accuracy,and inverse design.Integrating deep learning with THz sensor design enhances feature extraction from complex signals,improves target identification,and enables intelligent optimization of microstructure parameters for high-performance sensor design and performance prediction.This interdisciplinary approach provides a new pathway to overcome traditional design limitations and advance THz sensor performance.展开更多
基金the National Key Research and Development Program of China(Nos.2016YFA0301102 and 2017YFA0303800)the National Natural ScienceFund for Distinguished Young Scholars(No.11925403)+1 种基金the NationalNatural Science Foundation of China(Nos.11974193,91856101,and11774186)the Natural Science Foundation of Tianjin for DistinguishedYoung Scientists(No.18JCJQJC45700)。
文摘Topological photonics provides a new opportunity for the examination of novel topological properties of matter,in which the energy band theory and ideas in topology are utilized to manipulate the propagation of photons.Since the discovery of topological insulators in condensed matter,researchers have studied similar topological effects in photonics.Topological photonics can lead to materials that support the robust unidirectional propagation of light without back reflections.This ideal transport property is unprecedented in traditional optics and may lead to radical changes in integrated optical devices.In this review,we present the exciting developments of topological photonics and focus on several prominent milestones of topological phases in photonics,such as topological insulators,topological semimetals,and higher-order topological phases.We conclude with the prospect of novel topological effects and their applications in topological photonics.
基金supported by the National Basic Research Program of China under Grant No.2014CB339800the National High Technology Research and Development Program of China under Grant No.2011AA010205the National Natural Science Foundation of China under Grant No.61171027
文摘Terahertz （THz） technology promises important applications including imaging, spectroscopy, and communications. However, one of limitations at present for advancing THz applications is the lack of efficient devices to manipulate THz waves. Here, our recent important progresses in THz functional devices based on artificial microstructures, such as photonic crystal, metamaterial, and plasmonic structures, have been reviewed in this paper, involving the THz modulator, isolator, and sensor. These THz microstructure functional devices exhibit great promising potential in THz application systems.
基金supported by National Natural Science Foundation of China(Nos.62301509,62405293)General Project of China Postdoctoral Science Foundation(No.2025M770537)。
文摘Terahertz(THz)waves exhibit distinctive properties,such as high transmittance,pronounced absorption,and minimal photon energy,enabling a wide range of applications in biomedical diagnosis,non-destructive testing,and quality/safety monitoring of food and agricultural products.Consequently,THz-based sensors have garnered increasing attention.However,the design of traditional coupling structures fails to effectively match the high-frequency oscillation of THz waves,resulting in low signal energy transmission efficiency and limiting the performance of THz sensors,while microstructure technology can offer a solution by achieving localized enhancement of the electromagnetic field energy through precise matching of sub-wavelength resonance units with the high-frequency oscillation of THz waves,which significantly improves the sensitivity of THz sensors.This review summarizes the basic principles and research status of various THz sensors based on different microstructures,such as split-ring resonators(SRRs),photonic crystals,waveguide resonators,and surface plasmon resonance.Notably,the rapid development of artificial intelligence,especially deep learning,is increasingly influencing THz sensing technologies with its strengths in signal processing,pattern recognition accuracy,and inverse design.Integrating deep learning with THz sensor design enhances feature extraction from complex signals,improves target identification,and enables intelligent optimization of microstructure parameters for high-performance sensor design and performance prediction.This interdisciplinary approach provides a new pathway to overcome traditional design limitations and advance THz sensor performance.
