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学者姓名：黄异
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Abstract ：
To enhance the diagnostic capabilities of defective epoxy coating structures using terahertz non-destructive testing technology, this paper proposed a multiple damage identification algorithm based on multi-domain feature fusion and machine learning. Three typical defect types of coating structure with three severity levels were investigated. Firstly, Finite-Difference Time-Domain (FDTD) modelling generated terahertz pulsed imaging (TPI) signals for various defective structures, incorporating ageing-induced property variations. Secondly, time domain, frequency domain and wavelet packet energy parameters were extracted, then filtered via the importance analysis using an improved random forest method to obtain the critical features sensitive to the defective structures. Subsequently, the selected features were reconstructed into optimised eigenvectors and processed through a cascading Support Vector Machines (SVM) classifier with Particle Swarm Optimisation (PSO) algorithm. Defect types classification and defect severity assessment were implemented through the cascading classifier. Compared to the traditional single-stage multiclass classifier, the proposed feature filtering algorithm significantly enhanced discriminative feature precision and better captured critical coating structural characteristics. This optimisation ultimately improved defect classification accuracy and reliability. The results indicated that the method was effective and could be recommended for the actual application.
Keyword ：
machine learning machine learning Multi-domain feature Multi-domain feature terahertz pulsed imaging terahertz pulsed imaging various internal defect detection various internal defect detection
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| GB/T 7714 | Tu, Wanli , Zhong, Shuncong , Zhang, Qiukun et al. Multiple damage identification of epoxy coating structures based on terahertz pulse imaging technology and machine learning [J]. | NONDESTRUCTIVE TESTING AND EVALUATION , 2025 . |
| MLA | Tu, Wanli et al. "Multiple damage identification of epoxy coating structures based on terahertz pulse imaging technology and machine learning" . | NONDESTRUCTIVE TESTING AND EVALUATION (2025) . |
| APA | Tu, Wanli , Zhong, Shuncong , Zhang, Qiukun , Huang, Yi , Luo, Manting . Multiple damage identification of epoxy coating structures based on terahertz pulse imaging technology and machine learning . | NONDESTRUCTIVE TESTING AND EVALUATION , 2025 . |
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Structural defects in self-lubricating sliding bearings would lead to local stress concentration and service life reduction. The absence of accurate detection technology for micro defects in self-lubricating coating has seriously limited their application in mechanical equipment. A total variation (TV) fusion terahertz imaging method is proposed toward the unidentifiable micro defect induced by overlapping terahertz echoes. First, a range of indicators is developed to quantify the alterations of signal characteristics in different stages of the defect. Subsequently, the TV fusion based on these indicator images could clearly identify different defects. After that, a multinomial regression model is established through the mathematical relation of defect thicknesses and indicators, thus the defect thickness could be obtained accurately. The experimental results for surface defect detection and internal delamination measurement demonstrate the high accuracy and excellent robustness of the proposed method, making it attractive for defect detection and quality assessment of self-lubricating coating.
Keyword ：
Coatings Coatings Defect detection Defect detection Delamination Delamination Optical surface waves Optical surface waves Scanning electron microscopy Scanning electron microscopy self-lubricating coating self-lubricating coating Substrates Substrates Surface treatment Surface treatment Surface waves Surface waves terahertz imaging terahertz imaging Terahertz wave imaging Terahertz wave imaging Time-domain analysis Time-domain analysis total variation (TV) fusion total variation (TV) fusion
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| GB/T 7714 | Zhang, Zhenghao , Shi, Tingting , Huang, Yi et al. Defect Detection Method for Self-Lubricating Sliding Bearing Coating Using Terahertz Total Variation Image Fusion [J]. | IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT , 2025 , 74 . |
| MLA | Zhang, Zhenghao et al. "Defect Detection Method for Self-Lubricating Sliding Bearing Coating Using Terahertz Total Variation Image Fusion" . | IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT 74 (2025) . |
| APA | Zhang, Zhenghao , Shi, Tingting , Huang, Yi , Zhong, Shuncong , Zhuang, Caihong , Huang, Yonglin et al. Defect Detection Method for Self-Lubricating Sliding Bearing Coating Using Terahertz Total Variation Image Fusion . | IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT , 2025 , 74 . |
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Metamaterials (MMs) have become increasingly prominent in terahertz flexible devices. However, bending deformation often alters the structure of the unit, which affects the response performance and stability of MMs. Here, a metal-aperture metamaterial (MA-MM) utilizing the strong coupling effect induced by two resonance modes is innovatively proposed to address the mentioned limitations. Specifically, it is found that the coupling state between multiple resonance modes remains consistent at different bending angles. Under these circumstances, the generated Rabi splitting peak presents stable response performance even under low resonance intensity caused by excessive deformation. The experimental results demonstrate that despite the amplitude of two resonant peaks decreasing significantly by 87.6%, the Q-factor of the Rabi splitting only reduced by 14.8%. Furthermore, armed with the response mode of the Rabi splitting being unaffected by plasma excitation range, the designed MA-MMs are able to maintain constant Q-factors and frequencies on curved surfaces of varying sizes. These findings exhibit the characteristics of electromagnetic response for multi-mode resonance-coupled MAMMs on different curved surfaces, presenting a novel design approach for terahertz flexible functional devices. (c) 2024 Chinese Laser Press
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| GB/T 7714 | Zeng, Qiuming , Shi, Tingting , Huang, Yi et al. Freestanding metamaterial with constant coupling response for terahertz flexible functional devices [J]. | PHOTONICS RESEARCH , 2025 , 13 (1) . |
| MLA | Zeng, Qiuming et al. "Freestanding metamaterial with constant coupling response for terahertz flexible functional devices" . | PHOTONICS RESEARCH 13 . 1 (2025) . |
| APA | Zeng, Qiuming , Shi, Tingting , Huang, Yi , Zhong, Shuncong , Sun, Fuwei , Guan, Chenglong et al. Freestanding metamaterial with constant coupling response for terahertz flexible functional devices . | PHOTONICS RESEARCH , 2025 , 13 (1) . |
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Active absorption modulation is critical for advanced stealth technologies, especially given the emerging detection threat from terahertz atmospheric windows. However, due to the difficulty in balancing high absorption and tunability, the actual manufacturing of most terahertz absorbers usually neglects the integration of electrical tuning, which limits their development of dynamic wave trapping for electronic countermeasure systems. Here, a terahertz stealth metamaterial (TSM) with hierarchical ionotronic architecture is proposed to overcome the tradeoff. Large-area continuous MoS2 assemblies tightly attached poly(ionic liquid) (PIL) microarrays provide enough conditions for surface electron conduction and plasmon mode excitation. By establishing wave-electron-ion interaction pathways, the directional migration of free anions inside the PIL and the accumulation of excess charge carriers up to 100.4% at the MoS2 interfaces are promoted, thereby stimulating changes in the plasma frequency of the absorption system. Consequently, this micro-nano structural design enhances the absorption tunability and combines multiple dissipative behaviors. TSM exhibit high specific attenuation (-275 dB mm(-1)), frequency agility (21.4%), and phase switching (153.1 deg.) within terahertz atmospheric windows. Moreover, the template-assisted assembly strategy adopted has the potential to be used for the building of universal blocks operating within other frequency ranges.
Keyword ：
electric tuning electric tuning metamaterial metamaterial MoS2 MoS2 poly(ionic liquid) poly(ionic liquid) terahertz stealth terahertz stealth
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| GB/T 7714 | Zhong, Yujie , Sun, Fuwei , Zhong, Shuncong et al. Hierarchical MoS2/Poly(ionic liquid) Metamaterials for Electrically Tunable Terahertz Stealth [J]. | ADVANCED MATERIALS , 2025 , 37 (37) . |
| MLA | Zhong, Yujie et al. "Hierarchical MoS2/Poly(ionic liquid) Metamaterials for Electrically Tunable Terahertz Stealth" . | ADVANCED MATERIALS 37 . 37 (2025) . |
| APA | Zhong, Yujie , Sun, Fuwei , Zhong, Shuncong , Huang, Yi , Lin, Jiewen , Zhang, Qiukun et al. Hierarchical MoS2/Poly(ionic liquid) Metamaterials for Electrically Tunable Terahertz Stealth . | ADVANCED MATERIALS , 2025 , 37 (37) . |
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Multiple modes resonance provides the possibility of broadband filtering and has great potential applications in terahertz devices, including miniaturized spectrometers, hyperspectral imagers and optical switches in communication systems. However, it is difficult to further expand the bandwidth range due to the inability to stack an infinite number of resonant structures in a finite space. Here, an innovative method is reported for manipulating two localized surface plasmon polaritons (LSPP) modes by multiscale-coupled plasmonic fields to realize broadband filtering at terahertz (THz) frequencies. The interaction between two LSPP modes was verified theoretically and experimentally, exhibiting a prominent Rabi splitting and two peaks with high transmittance. Particularly, broadband filtering is accomplished by utilizing a double-layer structure that can be regarded as a cavity for inducing far-field interference. Experimental result demonstrates that the maximum transmission range of the bilayer metamaterial reaches 0.63 THz. Besides, the two wide bands can be integrated into one broadband through near-field coupling effects. The integration of strong coupling and far-field interference expands the transmission range of the double-layer metamaterial, further enhancing its capability for broadband filtering. This unique approach for manipulating multi-mode plasmonic coupling forges a convenient route for realizing broadband filtering.
Keyword ：
Broadband filtering Broadband filtering Far-field interference Far-field interference Multiple plasmon modes Multiple plasmon modes Strong coupling effect Strong coupling effect Terahertz metamaterials Terahertz metamaterials
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| GB/T 7714 | Zeng, Qiuming , Huang, Yi , Zhong, Shuncong et al. Manipulating multiple plasmon modes by coupling fields for broadband filtering in terahertz metamaterials [J]. | OPTICS AND LASER TECHNOLOGY , 2024 , 168 . |
| MLA | Zeng, Qiuming et al. "Manipulating multiple plasmon modes by coupling fields for broadband filtering in terahertz metamaterials" . | OPTICS AND LASER TECHNOLOGY 168 (2024) . |
| APA | Zeng, Qiuming , Huang, Yi , Zhong, Shuncong , Shi, Tingting , Chen, Jianxiong , Zhong, Yujie et al. Manipulating multiple plasmon modes by coupling fields for broadband filtering in terahertz metamaterials . | OPTICS AND LASER TECHNOLOGY , 2024 , 168 . |
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While thermal barrier coatings (TBCs) are being sprayed onto aero-engine turbine blades, or while the engine blade is working, high temperatures and strong impact forces will damage TBCs under thermal cycles, resulting in the coating peeling off from the blades. The current method of using ECT, IRT, or another method alone cannot achieve the real-time detection of coating defects with both high precision and high penetration power. Two detection methods, namely, terahertz pulsed imaging (TPI) and optical coherence tomography (OCT), were combined to evaluate typical defects observed in TBCs (including internal debonding cracks, surface high-temperature cracks, and surface etched cracks). The results showed that the OCT system successfully obtained the micron-level axial resolution, but the detection depth of the OCT system was limited. The TPI system achieved a higher penetration depth than OCT-hence, it can be used for the nondestructive detection and evaluation of the internal debonding defects in the sample-but its resolution needs to be improved. Following this conclusion, a method is proposed using TPI and OCT concurrently for the nondestructive testing and quantitative evaluation of TBCs on etched cracks, thus achieving progress both in terms of depth and resolution. In our experiment, defects with a depth of 519 mu m and a width of 100 mu m were measured. The proposed method is suitable for situations where multiple defects in TBC samples of blades need to be detected simultaneously during the working process. When there are defects deep inside the sample, more small cracks on the surface can be evaluated to achieve a combination of depth and accuracy.
Keyword ：
defects detection defects detection depth depth optical coherence tomography optical coherence tomography resolution resolution terahertz pulsed imaging terahertz pulsed imaging thermal barrier coatings thermal barrier coatings
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| GB/T 7714 | Luo, Manting , Zhong, Shuncong , Huang, Yi et al. Combined Terahertz Pulsed Imaging and Optical Coherence Tomography Detection Method for Multiple Defects in Thermal Barrier Coatings [J]. | COATINGS , 2024 , 14 (4) . |
| MLA | Luo, Manting et al. "Combined Terahertz Pulsed Imaging and Optical Coherence Tomography Detection Method for Multiple Defects in Thermal Barrier Coatings" . | COATINGS 14 . 4 (2024) . |
| APA | Luo, Manting , Zhong, Shuncong , Huang, Yi , Zhang, Zhenghao , Tu, Wanli . Combined Terahertz Pulsed Imaging and Optical Coherence Tomography Detection Method for Multiple Defects in Thermal Barrier Coatings . | COATINGS , 2024 , 14 (4) . |
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The planar hybrid metallic microstructured metamaterials can utilize the transverse electromagnetic resonance coupling effect of adjacent resonant units to enhance the absorption bandwidth (ABW), which is widely used in the design of broadband terahertz (THz) absorbers. However, it is difficult to further broaden the ABW since only a limited number of resonant units can be arranged in the 2-D plane. Here, we propose a pyramidal 3-D metamaterial absorber that increases the number of resonances by superimposing metallic dielectric layers with different sizes in the vertical direction. Ultrawideband wave absorption at THz frequencies is realized by longitudinal electromagnetic resonance coupling between the layers of the metamaterial structure. The results show that the 3-D metamaterial achieves more than 90% ultrabroadband absorption in the range of 0.83-2.73 THz with the relative ABW exceeding 106%. In addition, the equivalent circuit model of the absorber is constructed to verify the simulation results. This study provides a novel idea for the design and processing of ultrawideband THz absorbers.
Keyword ：
3-D metamaterial 3-D metamaterial equivalent circuit model equivalent circuit model terahertz (THz) absorber terahertz (THz) absorber ultrawideband ultrawideband
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| GB/T 7714 | Huang, Yi , Fu, Haiwen , Zhong, Shuncong et al. Ultrawideband Terahertz Absorption Induced by Pyramidal 3-D Metamaterial [J]. | IEEE TRANSACTIONS ON PLASMA SCIENCE , 2024 . |
| MLA | Huang, Yi et al. "Ultrawideband Terahertz Absorption Induced by Pyramidal 3-D Metamaterial" . | IEEE TRANSACTIONS ON PLASMA SCIENCE (2024) . |
| APA | Huang, Yi , Fu, Haiwen , Zhong, Shuncong , Sun, Fuwei , Zhong, Yujie , Zeng, Qiuming et al. Ultrawideband Terahertz Absorption Induced by Pyramidal 3-D Metamaterial . | IEEE TRANSACTIONS ON PLASMA SCIENCE , 2024 . |
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Terahertz (THz) metasurfaces have garnered significant interest in biochemical sensing due to their ability to confine field energy in deep subwavelength areas, dramatically enhancing the light-matter interaction. However, the substrate effect prevalent in conventional metasurfaces prevent the enhanced field penetrating into the substrate from interacting with matter, thereby severely limiting the sensitivity. Here, a 1-D V-shaped THz metasurface using a high refractive index HR-Si prism as an external coupler is reported. Tightly confined spoof surface plasmon polariton (SSPP) modes are excited on its all-metallic surface for strong light-matter interactions. The electric field is highly confined within the V-shaped resonant cavity, without any negative effects from the substrate. Owing to this, the metasurface exhibits outstanding performance in the sensing process with a sensitivity of 0.45 THz/RIU, a quality (Q) factor of 140.1, and a figure of merit (FoM) of 54.9 RIU-1. Crucially, the dynamic modulation of plasmon modes allows for a close match with molecular vibrations, enhancing the characteristic absorption of L-histidine by 33.34-fold. This integrated sensor with metasurfaces and prisms shows great potential for the THz detection of trace molecules.
Keyword ：
Substrate effect Substrate effect terahertz (THz) metasurface terahertz (THz) metasurface THz sensing THz sensing tightly confined spoof surface plasmon polariton (SSPP) tightly confined spoof surface plasmon polariton (SSPP)
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| GB/T 7714 | Huang, Yi , Yuan, Rongkun , Zhong, Shuncong et al. V-Shaped Metasurface-Induced Tightly Confined SSPP for Terahertz Sensing Enhancement [J]. | IEEE SENSORS JOURNAL , 2024 , 24 (17) : 27455-27464 . |
| MLA | Huang, Yi et al. "V-Shaped Metasurface-Induced Tightly Confined SSPP for Terahertz Sensing Enhancement" . | IEEE SENSORS JOURNAL 24 . 17 (2024) : 27455-27464 . |
| APA | Huang, Yi , Yuan, Rongkun , Zhong, Shuncong , Shi, Tingting , Sun, Fuwei , Lin, Tingling et al. V-Shaped Metasurface-Induced Tightly Confined SSPP for Terahertz Sensing Enhancement . | IEEE SENSORS JOURNAL , 2024 , 24 (17) , 27455-27464 . |
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Metamaterials based on quasi-bound states in the continuum (qBICs) with manipulable resonance quality (Q) factors have provided a standout platform for cutting-edge terahertz (THz) sensing applications. However, most so far have been implemented as conventional metal patch structures with adjacent substrate layers, incurring the limitation of insufficient light-matter interaction due to substrate effects. Here, qBIC-driven metamaterials with substrate-free metallic aperture structures for tailoring light-matter interactions and exhibiting near-ideal sensing performance is introduced. Specifically, it is incorporated ultrafast femtosecond laser processing technology to fabricate H-type metallic aperture metamaterials with accessible high-contrast Q factor resonances allowed by in-plane symmetry breaking. Correspondingly, stronger light field energies are applied to the interactions due to completely eliminating the confinement of the substrate effect, enabling experimental sensitivity of up to 0.86 THz RIU-1 for the qBIC resonance, 1.9 times that of the conventional dipole resonance. Moreover, a high Q qBIC resonance achieved by optimized asymmetry parameter is exploited for detecting ultrathin layers of L-proline molecules as low as 0.87 nmol. It is envisioned that this approach will deliver insights for real-time, precise, and high-performance detection of trace biomolecules, and open new perspectives for realizing ideal performance metadevices. A BIC-driven substrate-free terahertz metamaterial sensor is developed to completely overcome the limitation of insufficient light-matter interaction due to substrate effects. The experimental results report a sensing sensitivity up to 0.86 THz RIU-1 and exploit the tunable characteristic of the qBIC resonance to customize the structural configuration for different detection scenarios. image
Keyword ：
biosensors biosensors bound states in the continuum bound states in the continuum metamaterials metamaterials substrate-free substrate-free terahertz terahertz
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| GB/T 7714 | Lin, Tingling , Zeng, Qiuming , Huang, Yi et al. Substrate-Free Terahertz Metamaterial Sensors With Customizable Configuration and High Performance [J]. | ADVANCED OPTICAL MATERIALS , 2024 , 12 (29) . |
| MLA | Lin, Tingling et al. "Substrate-Free Terahertz Metamaterial Sensors With Customizable Configuration and High Performance" . | ADVANCED OPTICAL MATERIALS 12 . 29 (2024) . |
| APA | Lin, Tingling , Zeng, Qiuming , Huang, Yi , Zhong, Shuncong , Shi, Tingting , Zhong, Yujie et al. Substrate-Free Terahertz Metamaterial Sensors With Customizable Configuration and High Performance . | ADVANCED OPTICAL MATERIALS , 2024 , 12 (29) . |
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As a promising nondestructive testing (NDT) technique with a very adaptive physical modeling of wave transmission process, terahertz technology is used for the detection and characterization of nonpolar materials and the evaluation of layered and/or defective structures. THz-TDS can also be used to perform spectroscopic analysis and detect structural defects in thermal barrier coatings (TBCs) of aero-engines. Although it is generally difficult to measure the structure of the thin oxide layer of the thermal barrier coatings whose thickness is generally lower than 30 g m (the current axial resolution of the THz-TDS cannot exceed 30 g m). We were able to complete the detection of the oxide layer within 1-29 g m through simulation by using the SWT-BP algorithm. In this study, the analysis was performed on real -world samples, the fitting degree of the SWT-BP algorithm reached 0.77, and the minimum prediction error was less than 0.1 g m. The paper also put forward some improvement measures about the experimental results. (c) 2024 Optica Publishing Group
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| GB/T 7714 | Luo, Manting , Zhong, Shuncong , Huang, Yi et al. Experimental study of a thin thermally grown oxide layer in thermal barrier coatings based on the SWT-BP algorithm and terahertz technology [J]. | APPLIED OPTICS , 2024 , 63 (13) : 3430-3437 . |
| MLA | Luo, Manting et al. "Experimental study of a thin thermally grown oxide layer in thermal barrier coatings based on the SWT-BP algorithm and terahertz technology" . | APPLIED OPTICS 63 . 13 (2024) : 3430-3437 . |
| APA | Luo, Manting , Zhong, Shuncong , Huang, Yi , Zhang, Zhenghao , Nsengiyumva, Walter , Tu, Wanli . Experimental study of a thin thermally grown oxide layer in thermal barrier coatings based on the SWT-BP algorithm and terahertz technology . | APPLIED OPTICS , 2024 , 63 (13) , 3430-3437 . |
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