Zhijia Hu, Lulu Guo, Guangyin Qu, Xiaojuan Zhang, Siqi Li, Yan Kuai, Weiwei Fu, Jiangang Gao, Feng Xu, Yu Liu, Anderson S. L. Gomes, Benli Yu
Stretch-Tunable Laser
In Research Article e01891, Zhijia Hu, Guangyin Qu and co-workers demonstrate a flexible cholesteric liquid crystal elastomer (CLCE) laser capable of reversible color and lasing wavelength shifts (from yellow to red, 560-750 nm) under mechanical strain, with applications in visual motion sensing and wearable interactive devices. The vivid color transitions and the underlying photonic mechanism offer compelling imagery that can effectively convey the innovation and interdisciplinary nature of this work.
{"title":"Stretch-Tunable Liquid Crystal Elastomer Lasers for Visual Motion Sensing (Laser Photonics Rev. 20(3)/2026)","authors":"Zhijia Hu, Lulu Guo, Guangyin Qu, Xiaojuan Zhang, Siqi Li, Yan Kuai, Weiwei Fu, Jiangang Gao, Feng Xu, Yu Liu, Anderson S. L. Gomes, Benli Yu","doi":"10.1002/lpor.70879","DOIUrl":"10.1002/lpor.70879","url":null,"abstract":"<p><b>Stretch-Tunable Laser</b></p><p>In Research Article e01891, Zhijia Hu, Guangyin Qu and co-workers demonstrate a flexible cholesteric liquid crystal elastomer (CLCE) laser capable of reversible color and lasing wavelength shifts (from yellow to red, 560-750 nm) under mechanical strain, with applications in visual motion sensing and wearable interactive devices. The vivid color transitions and the underlying photonic mechanism offer compelling imagery that can effectively convey the innovation and interdisciplinary nature of this work.\u0000\u0000 <figure>\u0000 <div><picture>\u0000 <source></source></picture><p></p>\u0000 </div>\u0000 </figure></p>","PeriodicalId":204,"journal":{"name":"Laser & Photonics Reviews","volume":"20 3","pages":""},"PeriodicalIF":10.0,"publicationDate":"2026-02-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/lpor.70879","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146121881","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Izzatjon Allayarov, Andrey B. Evlyukhin, Antonio Calà Lesina
Membrane metasurfaces, formed by periodic arrangements of holes in a dielectric layer, are gaining attention for their easier manufacturing via subtractive techniques, unnecessity of substrates, and access to resonant near fields. Despite their practical relevance, their theoretical description remains elusive. Here, we present a semi-analytical dipole-quadrupole model for the multipole analysis of numerically obtained reflection and transmission spectra in metasurfaces excited at arbitrary angles. Dipole models are generally sufficient to study traditional metasurfaces made of solid nanostructures. However, the inclusion of electric and magnetic quadrupoles is necessary to study membrane metasurfaces, which offer an ideal platform to showcase our method. We demonstrate the importance of choosing the optimal position of a symmetric membrane metasurface's unit cell to ensure the sufficiency of the dipole-quadrupole approximation. We show that our formalism can explain complex phenomena arising from inter-multipole interference, including lattice anapole and generalized Kerker effects, Fano resonances, and quasi-bound states in the continuum. We also present the applicability of the method to membrane metasurfaces with non-centrosymmetric unit cells (e.g., conical holes and surface voids). By enabling a deeper insight into the coupling mechanisms leading to the formation of local and collective resonances, our method expands the electromagnetics toolbox to study, understand, and design conventional and membrane metasurfaces.
{"title":"Dipole-Quadrupole Model and Multipole Analysis of Resonant Membrane Metasurfaces","authors":"Izzatjon Allayarov, Andrey B. Evlyukhin, Antonio Calà Lesina","doi":"10.1002/lpor.202502674","DOIUrl":"https://doi.org/10.1002/lpor.202502674","url":null,"abstract":"Membrane metasurfaces, formed by periodic arrangements of holes in a dielectric layer, are gaining attention for their easier manufacturing via subtractive techniques, unnecessity of substrates, and access to resonant near fields. Despite their practical relevance, their theoretical description remains elusive. Here, we present a semi-analytical dipole-quadrupole model for the multipole analysis of numerically obtained reflection and transmission spectra in metasurfaces excited at arbitrary angles. Dipole models are generally sufficient to study traditional metasurfaces made of solid nanostructures. However, the inclusion of electric and magnetic quadrupoles is necessary to study membrane metasurfaces, which offer an ideal platform to showcase our method. We demonstrate the importance of choosing the optimal position of a symmetric membrane metasurface's unit cell to ensure the sufficiency of the dipole-quadrupole approximation. We show that our formalism can explain complex phenomena arising from inter-multipole interference, including lattice anapole and generalized Kerker effects, Fano resonances, and quasi-bound states in the continuum. We also present the applicability of the method to membrane metasurfaces with non-centrosymmetric unit cells (e.g., conical holes and surface voids). By enabling a deeper insight into the coupling mechanisms leading to the formation of local and collective resonances, our method expands the electromagnetics toolbox to study, understand, and design conventional and membrane metasurfaces.","PeriodicalId":204,"journal":{"name":"Laser & Photonics Reviews","volume":"9 1","pages":""},"PeriodicalIF":11.0,"publicationDate":"2026-02-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146115691","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Topological photonics has emerged as a transformative paradigm for terahertz (THz) science and technology, offering unprecedented control over electromagnetic waves through modes that are inherently robust against disorder, defects, and fabrication imperfections. 3D topological insulators (TIs), characterized by spin‑polarized Dirac surface states, provide a powerful materials platform for realizing tunable, low‑loss THz components with functionalities that surpass those of conventional photonic systems. Operating across a spectral range central to next‑generation imaging, sensing, and high‑capacity wireless communications, TI‑based devices promise enhanced performance, stability, and energy efficiency. This paper covers recent advances in THz photonic devices and circuits enabled by TIs and topological design principles. We first outline the fundamental electronic and optical properties of 3D TIs and evaluate their integration into THz modulators, switches, detectors, and emitters. We then discuss the progression from traditional TI‑based photonics to fully topological photonic platforms, highlighting the emergence of structures that support unidirectional, backscattering‑immune light transport. Finally, we examine how advanced topological phases, including quantum spin Hall, quantum valley Hall, and higher‑order topologies, unlock defect‑immune propagation, reflectionless interfaces, and reconfigurable THz circuitry. Together, these developments position topological photonic materials and architectures as a foundational technology for scalable, resilient, and high‑performance THz and quantum photonic systems.
{"title":"Topological Photonic Devices and Circuits at Terahertz Frequencies","authors":"Samane Kalhor, Srabani Kar, Ranjan Singh, Kaveh Delfanazari","doi":"10.1002/lpor.202503162","DOIUrl":"https://doi.org/10.1002/lpor.202503162","url":null,"abstract":"Topological photonics has emerged as a transformative paradigm for terahertz (THz) science and technology, offering unprecedented control over electromagnetic waves through modes that are inherently robust against disorder, defects, and fabrication imperfections. 3D topological insulators (TIs), characterized by spin‑polarized Dirac surface states, provide a powerful materials platform for realizing tunable, low‑loss THz components with functionalities that surpass those of conventional photonic systems. Operating across a spectral range central to next‑generation imaging, sensing, and high‑capacity wireless communications, TI‑based devices promise enhanced performance, stability, and energy efficiency. This paper covers recent advances in THz photonic devices and circuits enabled by TIs and topological design principles. We first outline the fundamental electronic and optical properties of 3D TIs and evaluate their integration into THz modulators, switches, detectors, and emitters. We then discuss the progression from traditional TI‑based photonics to fully topological photonic platforms, highlighting the emergence of structures that support unidirectional, backscattering‑immune light transport. Finally, we examine how advanced topological phases, including quantum spin Hall, quantum valley Hall, and higher‑order topologies, unlock defect‑immune propagation, reflectionless interfaces, and reconfigurable THz circuitry. Together, these developments position topological photonic materials and architectures as a foundational technology for scalable, resilient, and high‑performance THz and quantum photonic systems.","PeriodicalId":204,"journal":{"name":"Laser & Photonics Reviews","volume":"20 1","pages":""},"PeriodicalIF":11.0,"publicationDate":"2026-02-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146115693","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Zihao Zhu, Yixiao Yin, Alim Abdurahman, Qiming Peng, Wei Huang, Zhongfu An
Limited exciton utilization efficiency—primarily due to spin‐forbidden triplet transitions—remains a fundamental challenge in organic optoelectronics. Unlike conventional closed‐shell luminophores, open‐shell diradicaloids inherently overcome this limitation by enabling spin‐allowed emission from both singlet and triplet excited states. However, achieving high luminescence efficiency in diradicaloids remains challenging due to competing nonradiative decay pathways and structural instability. Herein, we report a super‐stable and highly luminescent Müller‐type diradicaloid, TPT‐CzPh, which achieves a record photoluminescence quantum yield (PLQY) of 16.9%—an order‐of‐magnitude improvement over the prototypical Müller hydrocarbon TTM‐PhTTM. Comprehensive spectroscopic and theoretical analyses attribute the enhanced emission to a rationally engineered donor–acceptor framework that enables efficient spin‐allowed transitions and suppresses nonradiative decay via minimized structural reorganization. Remarkably, TPT‐CzPh also exhibits pronounced X‐ray‐induced scintillation, representing the first luminescent diradicaloid functioning as a metal‐free organic scintillator. This dual achievement not only deepens understanding of excited‐state dynamics in diradicaloids but also bridges open‐shell photophysics with radiation detection, paving the way for next‐generation high‐efficiency optoelectronic materials.
{"title":"A Müller‐Type Diradicaloid With Efficient Spin‐Allowed Emission for X‐Ray Scintillation","authors":"Zihao Zhu, Yixiao Yin, Alim Abdurahman, Qiming Peng, Wei Huang, Zhongfu An","doi":"10.1002/lpor.202503022","DOIUrl":"https://doi.org/10.1002/lpor.202503022","url":null,"abstract":"Limited exciton utilization efficiency—primarily due to spin‐forbidden triplet transitions—remains a fundamental challenge in organic optoelectronics. Unlike conventional closed‐shell luminophores, open‐shell diradicaloids inherently overcome this limitation by enabling spin‐allowed emission from both singlet and triplet excited states. However, achieving high luminescence efficiency in diradicaloids remains challenging due to competing nonradiative decay pathways and structural instability. Herein, we report a super‐stable and highly luminescent Müller‐type diradicaloid, TPT‐CzPh, which achieves a record photoluminescence quantum yield (PLQY) of 16.9%—an order‐of‐magnitude improvement over the prototypical Müller hydrocarbon TTM‐PhTTM. Comprehensive spectroscopic and theoretical analyses attribute the enhanced emission to a rationally engineered donor–acceptor framework that enables efficient spin‐allowed transitions and suppresses nonradiative decay via minimized structural reorganization. Remarkably, TPT‐CzPh also exhibits pronounced X‐ray‐induced scintillation, representing the first luminescent diradicaloid functioning as a metal‐free organic scintillator. This dual achievement not only deepens understanding of excited‐state dynamics in diradicaloids but also bridges open‐shell photophysics with radiation detection, paving the way for next‐generation high‐efficiency optoelectronic materials.","PeriodicalId":204,"journal":{"name":"Laser & Photonics Reviews","volume":"31 1","pages":""},"PeriodicalIF":11.0,"publicationDate":"2026-02-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146121884","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Monica Pradhan, Shubhanshi Sharma, Ranjan Singh, Shailendra K. Varshney
Dielectric Mie resonators are an example of non-Hermitian systems where the light-matter interaction at the nanoscale supports the continuum of scattering states. It is well established that such systems exhibit radiative and absorptive losses, relating to the frequency and decay rate, respectively. To utilize the significant properties of such non-Hermitian systems, this work proposes to understand the anapole-mediated resonance coupling in a silicon hetero-dimer metasurface. The anapole–anapole interaction presents a strong coupling phenomenon under certain perturbations through an exceptional point transition. This coupling results in a Rabi splitting of 48.438 meV (11.7 THz). The concept of a two-level atomic system is employed to establish a comparative analysis between the atomic transitions and the resonant modes in the proposed system, which demonstrates a clear analogy that captures the essence of strong coupling. This system provides deeper insight into the interaction dynamics governing the hybridized optical modes, which is a promising platform for achieving substantial Purcell enhancement and yielding the reduction in lifetime around the anapole resonance. Consequently, the proposed dimer structure paves the way toward developing photon–emitter interfaces that are essential for next-generation photonic quantum networks.
{"title":"Exceptional Point and Strong Coupling of Anapoles Enhance Purcell Effect in All-Dielectric Heterodimer Metasurface","authors":"Monica Pradhan, Shubhanshi Sharma, Ranjan Singh, Shailendra K. Varshney","doi":"10.1002/lpor.202502853","DOIUrl":"https://doi.org/10.1002/lpor.202502853","url":null,"abstract":"Dielectric Mie resonators are an example of non-Hermitian systems where the light-matter interaction at the nanoscale supports the continuum of scattering states. It is well established that such systems exhibit radiative and absorptive losses, relating to the frequency and decay rate, respectively. To utilize the significant properties of such non-Hermitian systems, this work proposes to understand the anapole-mediated resonance coupling in a silicon hetero-dimer metasurface. The anapole–anapole interaction presents a strong coupling phenomenon under certain perturbations through an exceptional point transition. This coupling results in a Rabi splitting of <span data-altimg=\"/cms/asset/9fa8095d-0943-4609-a78e-96b46e112e21/lpor70963-math-0001.png\"></span><mjx-container ctxtmenu_counter=\"1\" ctxtmenu_oldtabindex=\"1\" jax=\"CHTML\" role=\"application\" sre-explorer- style=\"font-size: 103%; position: relative;\" tabindex=\"0\"><mjx-math aria-hidden=\"true\" location=\"graphic/lpor70963-math-0001.png\"><mjx-semantics><mjx-mo data-semantic- data-semantic-role=\"equality\" data-semantic-speech=\"tilde\" data-semantic-type=\"relation\"><mjx-c></mjx-c></mjx-mo></mjx-semantics></mjx-math><mjx-assistive-mml display=\"inline\" unselectable=\"on\"><math altimg=\"urn:x-wiley:18638880:media:lpor70963:lpor70963-math-0001\" display=\"inline\" location=\"graphic/lpor70963-math-0001.png\" xmlns=\"http://www.w3.org/1998/Math/MathML\"><semantics><mo data-semantic-=\"\" data-semantic-role=\"equality\" data-semantic-speech=\"tilde\" data-semantic-type=\"relation\">∼</mo>$sim$</annotation></semantics></math></mjx-assistive-mml></mjx-container>48.438 meV (11.7 THz). The concept of a two-level atomic system is employed to establish a comparative analysis between the atomic transitions and the resonant modes in the proposed system, which demonstrates a clear analogy that captures the essence of strong coupling. This system provides deeper insight into the interaction dynamics governing the hybridized optical modes, which is a promising platform for achieving substantial Purcell enhancement and yielding the reduction in lifetime around the anapole resonance. Consequently, the proposed dimer structure paves the way toward developing photon–emitter interfaces that are essential for next-generation photonic quantum networks.","PeriodicalId":204,"journal":{"name":"Laser & Photonics Reviews","volume":"21 1","pages":""},"PeriodicalIF":11.0,"publicationDate":"2026-02-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146116219","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The luminescence origin and underlying mechanism in 0D halide perovskites remain subjects of ongoing debate. In this study, we report on K3InCl6 perovskite that exhibits green emission under specific synthesis conditions. Our investigations reveal that the luminescence in K3InCl6 originates from defect-assisted electronic transition processes, wherein cation vacancies and anti-site defects form within the crystal lattice. These defects introduce sub-band exciton absorption and facilitate the formation of self-trapped excitons (STE), ultimately leading to radiative recombination and green luminescence emergence. Furthermore, K3InCl6 demonstrates reversible phase transformations upon atmospheric exposure and thermal treatment due to hydration and dehydration processes, enabling spectral and color tunability. This distinctive characteristic positions emissive K3InCl6 as a promising candidate for multimodal anti-counterfeiting applications. Our findings provide significant insights into elucidating the luminescence origination and mechanism in 0D halide perovskite materials, offering a valuable avenue for future research in this field.
{"title":"Defect-Assisted Self-Trapped Exciton Emission in Zero-Dimensional K3InCl6 Perovskite: Reversible Hydration Switching Toward Multimodal Anti-Counterfeiting","authors":"Xianzhong Shi, Chunyuan Hou, Baochen Wang","doi":"10.1002/lpor.202502420","DOIUrl":"https://doi.org/10.1002/lpor.202502420","url":null,"abstract":"The luminescence origin and underlying mechanism in 0D halide perovskites remain subjects of ongoing debate. In this study, we report on K<sub>3</sub>InCl<sub>6</sub> perovskite that exhibits green emission under specific synthesis conditions. Our investigations reveal that the luminescence in K<sub>3</sub>InCl<sub>6</sub> originates from defect-assisted electronic transition processes, wherein cation vacancies and anti-site defects form within the crystal lattice. These defects introduce sub-band exciton absorption and facilitate the formation of self-trapped excitons (STE), ultimately leading to radiative recombination and green luminescence emergence. Furthermore, K<sub>3</sub>InCl<sub>6</sub> demonstrates reversible phase transformations upon atmospheric exposure and thermal treatment due to hydration and dehydration processes, enabling spectral and color tunability. This distinctive characteristic positions emissive K<sub>3</sub>InCl<sub>6</sub> as a promising candidate for multimodal anti-counterfeiting applications. Our findings provide significant insights into elucidating the luminescence origination and mechanism in 0D halide perovskite materials, offering a valuable avenue for future research in this field.","PeriodicalId":204,"journal":{"name":"Laser & Photonics Reviews","volume":"105 1","pages":""},"PeriodicalIF":11.0,"publicationDate":"2026-02-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146109737","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Cylindrical vector beams (CVBs) that possess inhomogeneous spatial polarization distributions exhibit exceptional orthogonality between different modes, facilitating advanced applications in optical trapping, communication and quantum information processing. Nevertheless, existing CVB modulation suffers from limited channel capacity and uniform spatial vectorial distribution across diffraction orders, lacking flexible 3D multi-channel manipulation. Here, we investigate and experimentally demonstrate the spatially tailored 3D CVBs array generation via near-field superposition of right circularly polarized and left circularly polarized components based on a single metasurface, where the two polarization channels simultaneously produce 3D vortex beams (VBs) array with spatially varying and opposite topological charges spreading in M×N×P diffraction orders. The resulting 3D CVBs array exhibits distinct vectorial properties at each spatial diffraction order. Furthermore, we perform a comprehensive vectorial characterization and topological charge measurement of the generated high-capacity CVBs array and validate that the proposed method can be applied to construct complex vector vortex beams (VVBs) array. The engineered VVBs array incorporates multi-dimensional information of spatial position, spatial polarization distribution, and topological charge, endowing each diffraction order with distinctive and unique identity. While, the generation of 3D singular beams array unlocks new possibilities in optical manipulation, optical information encryption, parallel laser manufacturing, and optical metrology.
{"title":"Spatially Tailored 3D Cylindrical Vector Beams Array Generation Based on Metasurface","authors":"Yang Cui, Xue Zhang, Ruizhe Zhao, Shifei Zhang, Aoqi Ma, Guangzhou Geng, Junjie Li, Hao Sun, Yongtian Wang, Lingling Huang","doi":"10.1002/lpor.202503145","DOIUrl":"https://doi.org/10.1002/lpor.202503145","url":null,"abstract":"Cylindrical vector beams (CVBs) that possess inhomogeneous spatial polarization distributions exhibit exceptional orthogonality between different modes, facilitating advanced applications in optical trapping, communication and quantum information processing. Nevertheless, existing CVB modulation suffers from limited channel capacity and uniform spatial vectorial distribution across diffraction orders, lacking flexible 3D multi-channel manipulation. Here, we investigate and experimentally demonstrate the spatially tailored 3D CVBs array generation via near-field superposition of right circularly polarized and left circularly polarized components based on a single metasurface, where the two polarization channels simultaneously produce 3D vortex beams (VBs) array with spatially varying and opposite topological charges spreading in <i>M</i>×<i>N</i>×<i>P</i> diffraction orders. The resulting 3D CVBs array exhibits distinct vectorial properties at each spatial diffraction order. Furthermore, we perform a comprehensive vectorial characterization and topological charge measurement of the generated high-capacity CVBs array and validate that the proposed method can be applied to construct complex vector vortex beams (VVBs) array. The engineered VVBs array incorporates multi-dimensional information of spatial position, spatial polarization distribution, and topological charge, endowing each diffraction order with distinctive and unique identity. While, the generation of 3D singular beams array unlocks new possibilities in optical manipulation, optical information encryption, parallel laser manufacturing, and optical metrology.","PeriodicalId":204,"journal":{"name":"Laser & Photonics Reviews","volume":"8 1","pages":""},"PeriodicalIF":11.0,"publicationDate":"2026-02-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146109738","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The emerging topological structures within electromagnetic fields have attracted great interest because of their unique properties and potential applications. Here, we introduce interesting electromagnetic spin-momentum topologies on silicon-based waveguides, characterized by spin skyrmion (meron-antimeron) arrays overlapped with momentum vortices yielding local transverse orbital angular momentum. These composite textures, derived from Poynting vortex streets, are produced by vectorial superpositions of two counter-propagating modes with different orders. Importantly, these topological structures can be dynamically controlled to transverse shift and longitudinal flow by modulating the relative amplitudes and phases (or frequencies) between the counter-propagating modes, respectively. The controllable topological spin-momentum flows uncovered here may open new doors to on-chip optical manipulation, sorting, waveguide quantum electrodynamics, and optofluidic techniques.
{"title":"Topological Spin-Momentum Flows on a Silicon Chip","authors":"Peilin Liu, Jiayi Zhang, Jinman Chen, Qinjun Chen, Chujun Zhao, Liang Fang","doi":"10.1002/lpor.202501647","DOIUrl":"https://doi.org/10.1002/lpor.202501647","url":null,"abstract":"The emerging topological structures within electromagnetic fields have attracted great interest because of their unique properties and potential applications. Here, we introduce interesting electromagnetic spin-momentum topologies on silicon-based waveguides, characterized by spin skyrmion (meron-antimeron) arrays overlapped with momentum vortices yielding local transverse orbital angular momentum. These composite textures, derived from Poynting vortex streets, are produced by vectorial superpositions of two counter-propagating modes with different orders. Importantly, these topological structures can be dynamically controlled to transverse shift and longitudinal flow by modulating the relative amplitudes and phases (or frequencies) between the counter-propagating modes, respectively. The controllable topological spin-momentum flows uncovered here may open new doors to on-chip optical manipulation, sorting, waveguide quantum electrodynamics, and optofluidic techniques.","PeriodicalId":204,"journal":{"name":"Laser & Photonics Reviews","volume":"19 1","pages":""},"PeriodicalIF":11.0,"publicationDate":"2026-02-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146109736","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Ming Kang, Tianmeng Zhang, Ziru Geng, Xiuying Liu, Jing Chen
Polarization singularities provide exceptional control over light, yet their potential is limited by challenges in controllably steering individual singularities and coordinating them collectively in the momentum space. We address this challenge by mapping the evolutionary pathways of multi-type singularities from bound states in the continuums (BICs) to degeneracy-associated polarization singularity in a dielectric Lieb-lattice photonic crystal slab. We demonstrate that a single parameter can orchestrate the birth, motion, and interconversion of singularities across different classes and bands. This capability enables three fundamental control modalities: (1) deterministic topological charge switching of Γ-BICs through bifurcation; (2) continuous trajectory control of off-Γ BICs along symmetry directions; (3) precise positioning of Dirac-type degeneracy-bound singularities. Significantly, our approach overcomes the traditional confinement of Dirac-type degeneracy-linked polarization singularities to high-symmetry locations, enabling their free migration throughout the momentum space. Our findings establish a new paradigm for synergistic singularity manipulation in planar photonics, and the underlying mechanism can be applied to other wave systems.
{"title":"Synergistic Control of Multi-Type Polarization Singularities in a Lieb Photonic Crystal Slab","authors":"Ming Kang, Tianmeng Zhang, Ziru Geng, Xiuying Liu, Jing Chen","doi":"10.1002/lpor.202503105","DOIUrl":"https://doi.org/10.1002/lpor.202503105","url":null,"abstract":"Polarization singularities provide exceptional control over light, yet their potential is limited by challenges in controllably steering individual singularities and coordinating them collectively in the momentum space. We address this challenge by mapping the evolutionary pathways of multi-type singularities from bound states in the continuums (BICs) to degeneracy-associated polarization singularity in a dielectric Lieb-lattice photonic crystal slab. We demonstrate that a single parameter can orchestrate the birth, motion, and interconversion of singularities across different classes and bands. This capability enables three fundamental control modalities: (1) deterministic topological charge switching of Γ-BICs through bifurcation; (2) continuous trajectory control of off-Γ BICs along symmetry directions; (3) precise positioning of Dirac-type degeneracy-bound singularities. Significantly, our approach overcomes the traditional confinement of Dirac-type degeneracy-linked polarization singularities to high-symmetry locations, enabling their free migration throughout the momentum space. Our findings establish a new paradigm for synergistic singularity manipulation in planar photonics, and the underlying mechanism can be applied to other wave systems.","PeriodicalId":204,"journal":{"name":"Laser & Photonics Reviews","volume":"34 1","pages":""},"PeriodicalIF":11.0,"publicationDate":"2026-02-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146109739","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Linlin Shi, Zuoxin Shi, Mingru Chang, Zhiyuan Gao, Yanxia Cui, Ting Ji, Guohui Li
Highly sensitive organic photomultiplication photodetectors (PM-OPDs) have important applications in the fields of communications, medicine, and environment. However, the prevalent use of acidity poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT: PSS) hole transport layer (HTL) in PM-OPDs yields undesirable interfacial defects, resulting in the compromise of device performances. To avoid this, the bilayer interfacial engineering is introduced by incorporating an atomically-thick Al2O3 interlayer with MoO3 HTL. It reveals that engineering the bilayer is crucial for the high-quality MoO3 HTL and adjusts Ohmic contact to Schottky contact near anode, which facilitates the suppressed dark current and maximized photocurrent of the device. Besides, the device exhibits the photoresponse to short-wave infrared by P3HT:Y6 complex, because of the intermolecular charge transfer transition at the interface of P3HT and Y6. The results show that the bilayer-PM-OPDs manifest the high external quantum efficiency and responsivity of 5.94 × 103% and 57 A/W at 1200 nm, superior to the MoO3 control device (19.3%, 0.19 A/W, respectively). Simultaneously, the proposed device exhibits the detectivity of 1.28 × 1013 Jones at 1200 nm and a broad dynamic range of 105 and 45 dB at 850 and 1310 nm. This work opens new horizons for high-performance SWIR PM-OPDs in various applications.
{"title":"Bilayer Interfacial Engineering Enabling Highly Sensitive Organic Photomultiplication Photodetector Across to Short-Wave Infrared via Charge Transfer","authors":"Linlin Shi, Zuoxin Shi, Mingru Chang, Zhiyuan Gao, Yanxia Cui, Ting Ji, Guohui Li","doi":"10.1002/lpor.202501543","DOIUrl":"https://doi.org/10.1002/lpor.202501543","url":null,"abstract":"Highly sensitive organic photomultiplication photodetectors (PM-OPDs) have important applications in the fields of communications, medicine, and environment. However, the prevalent use of acidity poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT: PSS) hole transport layer (HTL) in PM-OPDs yields undesirable interfacial defects, resulting in the compromise of device performances. To avoid this, the bilayer interfacial engineering is introduced by incorporating an atomically-thick Al<sub>2</sub>O<sub>3</sub> interlayer with MoO<sub>3</sub> HTL. It reveals that engineering the bilayer is crucial for the high-quality MoO<sub>3</sub> HTL and adjusts Ohmic contact to Schottky contact near anode, which facilitates the suppressed dark current and maximized photocurrent of the device. Besides, the device exhibits the photoresponse to short-wave infrared by P3HT:Y6 complex, because of the intermolecular charge transfer transition at the interface of P3HT and Y6. The results show that the bilayer-PM-OPDs manifest the high external quantum efficiency and responsivity of 5.94 × 10<sup>3</sup>% and 57 A/W at 1200 nm, superior to the MoO<sub>3</sub> control device (19.3%, 0.19 A/W, respectively). Simultaneously, the proposed device exhibits the detectivity of 1.28 × 10<sup>13</sup> Jones at 1200 nm and a broad dynamic range of 105 and 45 dB at 850 and 1310 nm. This work opens new horizons for high-performance SWIR PM-OPDs in various applications.","PeriodicalId":204,"journal":{"name":"Laser & Photonics Reviews","volume":"90 1","pages":""},"PeriodicalIF":11.0,"publicationDate":"2026-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146109740","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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