Pub Date : 2026-06-15Epub Date: 2026-03-03DOI: 10.1016/j.physleta.2026.131539
Umer Wahid, Yao Peijun, Xu Lixin
The lateral Goos–Hänchen (GH) shift of reflected and transmitted light beams incident on a cavity containing a four-level tripod atomic medium is investigated. We show that the GH shift can be coherently controlled and significantly modified through the superposition of super-Gaussian light fields. In the case of higher-order super-Gaussian beams, a substantial enhancement of the GH shift is observed, reaching values as large as 110λ. Furthermore, we demonstrate that the GH shift can be coherently tuned by controlling the detunings (Δa, Δc) and Rabi frequencies (Ωa, Ωc) of the driving fields, offering versatile control over the lateral beam displacement. The reflection and transmission spectra exhibit a strong dependence on the azimuthal quantum number when structured light fields are employed. An increase in this parameter enhances the modulation strength, resulting in well-defined elliptical spatial patterns in both reflection and transmission. These results offer a promising route for tunable beam displacement and hold potential for applications in advanced photonic device engineering.
{"title":"Reflection and transmission of structured light beams: Lateral Goos-Hänchen shift analysis","authors":"Umer Wahid, Yao Peijun, Xu Lixin","doi":"10.1016/j.physleta.2026.131539","DOIUrl":"10.1016/j.physleta.2026.131539","url":null,"abstract":"<div><div>The lateral Goos–Hänchen (GH) shift of reflected and transmitted light beams incident on a cavity containing a four-level tripod atomic medium is investigated. We show that the GH shift can be coherently controlled and significantly modified through the superposition of super-Gaussian light fields. In the case of higher-order super-Gaussian beams, a substantial enhancement of the GH shift is observed, reaching values as large as 110<em>λ</em>. Furthermore, we demonstrate that the GH shift can be coherently tuned by controlling the detunings (Δ<sub><em>a</em></sub>, Δ<sub><em>c</em></sub>) and Rabi frequencies (Ω<sub><em>a</em></sub>, Ω<sub><em>c</em></sub>) of the driving fields, offering versatile control over the lateral beam displacement. The reflection and transmission spectra exhibit a strong dependence on the azimuthal quantum number when structured light fields are employed. An increase in this parameter enhances the modulation strength, resulting in well-defined elliptical spatial patterns in both reflection and transmission. These results offer a promising route for tunable beam displacement and hold potential for applications in advanced photonic device engineering.</div></div>","PeriodicalId":20172,"journal":{"name":"Physics Letters A","volume":"581 ","pages":"Article 131539"},"PeriodicalIF":2.6,"publicationDate":"2026-06-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147388204","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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}
Pub Date : 2026-05-15Epub Date: 2026-02-09DOI: 10.1016/j.physleta.2026.131472
S.E. Savotchenko
This paper presents a theoretical investigation of the localization of a transverse electric wave near a planar interface between a nonlinear medium and a graded-index medium characterized by a monotonic decrease in the refractive index. An intensity-dependent nonlinearity model, where a nonlinear optical response occurs when the electric field exceeds a threshold value, is used. This model is combined with a hyperbolic attenuation profile of the refractive index in the graded-index medium. This configuration allows for an exact analytical solution of the corresponding nonlinear boundary-value problem. New exact solutions for nonlinear surface waves propagating along the interface are derived and expressed in terms of the Macdonald function, the order of which is determined by the optical parameters of the graded-index medium. Both positive (self-focusing) and negative (defocusing) nonlinear responses are analyzed in detail. The spatial profile of the surface wave exhibits different features depending on the sign of the nonlinearity. In particular, for a negative nonlinearity coefficient, the field maximum is exclusively found in a medium with a graded refractive index, whereas for a positive coefficient, it can be located in any medium, depending on the system parameters. Furthermore, the effective refractive index of a surface wave is bounded below for positive nonlinearity and above for negative nonlinearity, which imposes certain restrictions on the admissible parameter space for the wave existence.
{"title":"Theoretical modeling of the wave localization near the planar contact of the intensity dependent nonlinear medium and the medium with monotonically reducing refractive index","authors":"S.E. Savotchenko","doi":"10.1016/j.physleta.2026.131472","DOIUrl":"10.1016/j.physleta.2026.131472","url":null,"abstract":"<div><div>This paper presents a theoretical investigation of the localization of a transverse electric wave near a planar interface between a nonlinear medium and a graded-index medium characterized by a monotonic decrease in the refractive index. An intensity-dependent nonlinearity model, where a nonlinear optical response occurs when the electric field exceeds a threshold value, is used. This model is combined with a hyperbolic attenuation profile of the refractive index in the graded-index medium. This configuration allows for an exact analytical solution of the corresponding nonlinear boundary-value problem. New exact solutions for nonlinear surface waves propagating along the interface are derived and expressed in terms of the Macdonald function, the order of which is determined by the optical parameters of the graded-index medium. Both positive (self-focusing) and negative (defocusing) nonlinear responses are analyzed in detail. The spatial profile of the surface wave exhibits different features depending on the sign of the nonlinearity. In particular, for a negative nonlinearity coefficient, the field maximum is exclusively found in a medium with a graded refractive index, whereas for a positive coefficient, it can be located in any medium, depending on the system parameters. Furthermore, the effective refractive index of a surface wave is bounded below for positive nonlinearity and above for negative nonlinearity, which imposes certain restrictions on the admissible parameter space for the wave existence.</div></div>","PeriodicalId":20172,"journal":{"name":"Physics Letters A","volume":"578 ","pages":"Article 131472"},"PeriodicalIF":2.6,"publicationDate":"2026-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146173082","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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}
Pub Date : 2026-05-15Epub Date: 2026-02-10DOI: 10.1016/j.physleta.2026.131471
Samira Elghaayda , Atta Ur Rahman , Mostafa Mansour
Quantum coherence in curved spacetime offers a fresh window into the interplay between gravity, thermality, and quantum resources. While previous work has shown that Markovian evolution can generate entanglement and other nonclassical correlations in de Sitter backgrounds, the basis-dependent nature of coherence has so far limited its unambiguous interpretation. Here, we introduce a basis-independent framework to quantify not only the total coherence of two comoving detectors, but also its collective and localized contributions, and we trace how each of these decomposed measures varies with the inverse of Gibbons-Hawking temperature. By treating the detectors as open quantum systems interacting with a massless scalar field in the Bunch-Davies and squeezed α-vacua, we find that non-thermal squeezing substantially enhances extractable coherence, even under strong thermal effects. Our results demonstrate how basis-independent coherence in de Sitter spacetime can serve as a robust resource for relativistic quantum information protocols.
{"title":"Basis-independent coherence and its distribution in de Sitter spacetime","authors":"Samira Elghaayda , Atta Ur Rahman , Mostafa Mansour","doi":"10.1016/j.physleta.2026.131471","DOIUrl":"10.1016/j.physleta.2026.131471","url":null,"abstract":"<div><div>Quantum coherence in curved spacetime offers a fresh window into the interplay between gravity, thermality, and quantum resources. While previous work has shown that Markovian evolution can generate entanglement and other nonclassical correlations in de Sitter backgrounds, the basis-dependent nature of coherence has so far limited its unambiguous interpretation. Here, we introduce a basis-independent framework to quantify not only the total coherence of two comoving detectors, but also its collective and localized contributions, and we trace how each of these decomposed measures varies with the inverse of Gibbons-Hawking temperature. By treating the detectors as open quantum systems interacting with a massless scalar field in the Bunch-Davies and squeezed <em>α</em>-vacua, we find that non-thermal squeezing substantially enhances extractable coherence, even under strong thermal effects. Our results demonstrate how basis-independent coherence in de Sitter spacetime can serve as a robust resource for relativistic quantum information protocols.</div></div>","PeriodicalId":20172,"journal":{"name":"Physics Letters A","volume":"578 ","pages":"Article 131471"},"PeriodicalIF":2.6,"publicationDate":"2026-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146173010","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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}
Pub Date : 2026-05-15Epub Date: 2026-02-10DOI: 10.1016/j.physleta.2026.131478
T. Sonia , B. Reyoun Frances , M.K. Komal poojha , G. Mahesh Kumar , R. Parameshwari , B.G. Jeyaprakash
Acetone detection in industrial settings is important because of its toxicity and volatility. In the present study, we report the preparation of filamentous-network structured tungsten oxide (WO₃) thin films using a simple spray pyrolysis method. Also, demonstrate their application as an acetone sensor. Structural and morphological studies show that increasing the substrate temperature to 400 °C, results high crystalline monoclinic WO₃, with porous filamentous network, favorable for vapor diffusion. The prepared sensor displayed an excellent response towards acetone at 250 °C, with a wide detection range of 1–200 ppm, detection limit of 1 ppm, and response/recovery time of 60/67 s. Selectivity studies in mixed environment confirmed that it preferentially responded to acetone. After 10 h of continuous exposure the sensor exhibited good compositional stability. Density functional theory (DFT) calculations on monoclinic WO3 (200) plane, supported the experimental results by confirming that acetone adsorption is exothermic and changes the electronic states close to the Fermi level. The single-step, undoped, filamentous-network WO3 structure enables a wide detection range at 250 °C and demonstrates a scalable, cost-effective platform for acetone level monitoring in plastic industrial environments.
{"title":"Filamentous network structured WO3 as acetone sensor through spray pyrolysis technique with theoretical approach of molecular interaction","authors":"T. Sonia , B. Reyoun Frances , M.K. Komal poojha , G. Mahesh Kumar , R. Parameshwari , B.G. Jeyaprakash","doi":"10.1016/j.physleta.2026.131478","DOIUrl":"10.1016/j.physleta.2026.131478","url":null,"abstract":"<div><div>Acetone detection in industrial settings is important because of its toxicity and volatility. In the present study, we report the preparation of filamentous-network structured tungsten oxide (WO₃) thin films using a simple spray pyrolysis method. Also, demonstrate their application as an acetone sensor. Structural and morphological studies show that increasing the substrate temperature to 400 °C, results high crystalline monoclinic WO₃, with porous filamentous network, favorable for vapor diffusion. The prepared sensor displayed an excellent response towards acetone at 250 °C, with a wide detection range of 1–200 ppm, detection limit of 1 ppm, and response/recovery time of 60/67 s. Selectivity studies in mixed environment confirmed that it preferentially responded to acetone. After 10 h of continuous exposure the sensor exhibited good compositional stability. Density functional theory (DFT) calculations on monoclinic WO<sub>3</sub> (200) plane, supported the experimental results by confirming that acetone adsorption is exothermic and changes the electronic states close to the Fermi level. The single-step, undoped, filamentous-network WO<sub>3</sub> structure enables a wide detection range at 250 °C and demonstrates a scalable, cost-effective platform for acetone level monitoring in plastic industrial environments.</div></div>","PeriodicalId":20172,"journal":{"name":"Physics Letters A","volume":"578 ","pages":"Article 131478"},"PeriodicalIF":2.6,"publicationDate":"2026-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146161850","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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}
Pub Date : 2026-05-05Epub Date: 2026-01-30DOI: 10.1016/j.physleta.2026.131439
Yingying Yu, Siyu Ning, Bo Sun
This study explicitly investigates the application of toroidal electric and magnetic dipoles with mutually perpendicular configurations for efficient energy transfer. By aligning the dipoles perpendicularly, we enhance energy transfer through a toroidal dipole pair. Using a combination of theoretical modeling and experimental validation, we examine the mechanism of power transmission along a toroidal dipole chain within an all-dielectric waveguide. Theoretical calculations, supported by principles similar to reciprocity, reveal a significant increase in transmission efficiency due to the perpendicular interaction between toroidal electric and magnetic dipoles. Our experimental results, validated by numerical simulations and microwave tests, demonstrate that the transmission efficiency remains robust, achieving 85% efficiency at a distance of 80 cm, with minimal performance degradation even at longer distances. This work offers new insights into the fundamental role of toroidal dipoles in energy transfer, with promising implications for the design of advanced dielectric waveguide systems.
{"title":"Power transfer in all-dielectric waveguide aided by the toroidal dipole","authors":"Yingying Yu, Siyu Ning, Bo Sun","doi":"10.1016/j.physleta.2026.131439","DOIUrl":"10.1016/j.physleta.2026.131439","url":null,"abstract":"<div><div>This study explicitly investigates the application of toroidal electric and magnetic dipoles with mutually perpendicular configurations for efficient energy transfer. By aligning the dipoles perpendicularly, we enhance energy transfer through a toroidal dipole pair. Using a combination of theoretical modeling and experimental validation, we examine the mechanism of power transmission along a toroidal dipole chain within an all-dielectric waveguide. Theoretical calculations, supported by principles similar to reciprocity, reveal a significant increase in transmission efficiency due to the perpendicular interaction between toroidal electric and magnetic dipoles. Our experimental results, validated by numerical simulations and microwave tests, demonstrate that the transmission efficiency remains robust, achieving 85% efficiency at a distance of 80 cm, with minimal performance degradation even at longer distances. This work offers new insights into the fundamental role of toroidal dipoles in energy transfer, with promising implications for the design of advanced dielectric waveguide systems.</div></div>","PeriodicalId":20172,"journal":{"name":"Physics Letters A","volume":"577 ","pages":"Article 131439"},"PeriodicalIF":2.6,"publicationDate":"2026-05-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146122671","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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}
Pub Date : 2026-05-05Epub Date: 2026-02-01DOI: 10.1016/j.physleta.2026.131453
Lingfang Yang , Zhifa Shan , Shuping Li
This study proposes a method based on the co-optimisation of phase shift position and coupling coefficient, revealing the variation curves of SMSR affected by random phase at different phase shift positions. Concurrently, it analyses output power variations to ensure high-power output and single-mode yield in continuous-wave distributed feedback (CW-DFB) lasers. Theoretical modelling and numerical simulations demonstrate that stable single-mode characteristics are achieved when the grating phase shift position is 0.33 L from the HR end-face, yielding a single-mode yield approaching its maximum value. Experimental validation confirms the accuracy of the simulation results, whilst also analysing the influence of phase shift position on the laser's output power characteristics.
{"title":"Research on random phase suppression in CW-DFB lasers","authors":"Lingfang Yang , Zhifa Shan , Shuping Li","doi":"10.1016/j.physleta.2026.131453","DOIUrl":"10.1016/j.physleta.2026.131453","url":null,"abstract":"<div><div>This study proposes a method based on the co-optimisation of phase shift position and coupling coefficient, revealing the variation curves of SMSR affected by random phase at different phase shift positions. Concurrently, it analyses output power variations to ensure high-power output and single-mode yield in continuous-wave distributed feedback (CW-DFB) lasers. Theoretical modelling and numerical simulations demonstrate that stable single-mode characteristics are achieved when the grating phase shift position is 0.33 L from the HR end-face, yielding a single-mode yield approaching its maximum value. Experimental validation confirms the accuracy of the simulation results, whilst also analysing the influence of phase shift position on the laser's output power characteristics.</div></div>","PeriodicalId":20172,"journal":{"name":"Physics Letters A","volume":"577 ","pages":"Article 131453"},"PeriodicalIF":2.6,"publicationDate":"2026-05-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146122672","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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}
Pub Date : 2026-04-28Epub Date: 2026-01-29DOI: 10.1016/j.physleta.2026.131422
Vivek Kumar , M.P. Singh , R. Srikanth
The interpretation of quantum mechanics continues to be debated, and quantum nonlocality accentuates the puzzle. Quantum interpretations can be classified broadly into two types: realist interpretations, which assert that quantum states describe objective reality (even if hidden or branching), and subjective interpretations, which treat quantum states as observer-dependent information or beliefs about the system. Here we study the implication of quantum interpretations for causal explanations of Bell nonlocal correlations, and show that a given interpretation type carries an inherent commitment to a preferred causal structure. Specifically, we find that realist interpretations entail a classical causal model, and thus require Fine-Tuning to prevent superluminal signaling, while subjective interpretations are found to entail a framework of nonclassical causal models. The implications of our results for one-way quantum computation and computation-based Bell nonlocality are studied.
{"title":"Quantum interpretations, causality and quantum computation","authors":"Vivek Kumar , M.P. Singh , R. Srikanth","doi":"10.1016/j.physleta.2026.131422","DOIUrl":"10.1016/j.physleta.2026.131422","url":null,"abstract":"<div><div>The interpretation of quantum mechanics continues to be debated, and quantum nonlocality accentuates the puzzle. Quantum interpretations can be classified broadly into two types: <em>realist interpretations</em>, which assert that quantum states describe objective reality (even if hidden or branching), and <em>subjective interpretations</em>, which treat quantum states as observer-dependent information or beliefs about the system. Here we study the implication of quantum interpretations for causal explanations of Bell nonlocal correlations, and show that a given interpretation type carries an inherent commitment to a preferred causal structure. Specifically, we find that realist interpretations entail a classical causal model, and thus require Fine-Tuning to prevent superluminal signaling, while subjective interpretations are found to entail a framework of nonclassical causal models. The implications of our results for one-way quantum computation and computation-based Bell nonlocality are studied.</div></div>","PeriodicalId":20172,"journal":{"name":"Physics Letters A","volume":"576 ","pages":"Article 131422"},"PeriodicalIF":2.6,"publicationDate":"2026-04-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146081868","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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}
Pub Date : 2026-04-28Epub Date: 2026-01-27DOI: 10.1016/j.physleta.2026.131419
Volodymyr M. Lashkin , Oleg K. Cheremnykh , Alla K. Fedorenko
We derive a generalized equation for three-dimensional (3D) nonlinear Rossby waves in a stratified atmosphere and a generalized Hasegawa-Mima equation for 3D drift waves in plasma in the case of the presence of an additional scalar nonlinearity of the Korteweg-de Vries (KdV) type. After rescaling the spatial variables, these equations have solutions in the form of 3D monopole solitons, and the vector nonlinearities vanish identically. Using the variational method, we obtain an approximate analytical solution that is in good agreement with the numerical one. In the case of Rossby waves, the soliton has a pancake-shaped form, whereas for the drift waves both pancake and almost spherically symmetric solitons are possible.
{"title":"Three-dimensional pancake monopole Rossby soliton and drift soliton in plasmas","authors":"Volodymyr M. Lashkin , Oleg K. Cheremnykh , Alla K. Fedorenko","doi":"10.1016/j.physleta.2026.131419","DOIUrl":"10.1016/j.physleta.2026.131419","url":null,"abstract":"<div><div>We derive a generalized equation for three-dimensional (3D) nonlinear Rossby waves in a stratified atmosphere and a generalized Hasegawa-Mima equation for 3D drift waves in plasma in the case of the presence of an additional scalar nonlinearity of the Korteweg-de Vries (KdV) type. After rescaling the spatial variables, these equations have solutions in the form of 3D monopole solitons, and the vector nonlinearities vanish identically. Using the variational method, we obtain an approximate analytical solution that is in good agreement with the numerical one. In the case of Rossby waves, the soliton has a pancake-shaped form, whereas for the drift waves both pancake and almost spherically symmetric solitons are possible.</div></div>","PeriodicalId":20172,"journal":{"name":"Physics Letters A","volume":"576 ","pages":"Article 131419"},"PeriodicalIF":2.6,"publicationDate":"2026-04-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146081869","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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}
Pub Date : 2026-04-28Epub Date: 2026-01-24DOI: 10.1016/j.physleta.2026.131398
Rostislav Arkhipov, Mikhail Arkhipov, Nikolay Rosanov
We demonstrate that a single atom can act as an elementary source of half-cycle light, unveiling the fundamental mechanism behind unipolar pulse generation. By solving the time-dependent Schrödinger equation, we show that an intense single-cycle optical pulse triggers a “femtosecond dipole switch”: the leading half-wave causes a sudden jump of the atomic dipole via tunneling ionization, while the trailing half-wave induces its a slow reduction via electron rescattering. This two-step process directly maps the sub-cycle field dynamics onto a quasi-unipolar electromagnetic transient, establishing strong-field recollision as a primary building block for attosecond half-cycle optical field synthesis.
{"title":"Unipolar half-cycle light emission from strong-field driven atoms","authors":"Rostislav Arkhipov, Mikhail Arkhipov, Nikolay Rosanov","doi":"10.1016/j.physleta.2026.131398","DOIUrl":"10.1016/j.physleta.2026.131398","url":null,"abstract":"<div><div>We demonstrate that a single atom can act as an elementary source of half-cycle light, unveiling the fundamental mechanism behind unipolar pulse generation. By solving the time-dependent Schrödinger equation, we show that an intense single-cycle optical pulse triggers a “femtosecond dipole switch”: the leading half-wave causes a sudden jump of the atomic dipole via tunneling ionization, while the trailing half-wave induces its a slow reduction via electron rescattering. This two-step process directly maps the sub-cycle field dynamics onto a quasi-unipolar electromagnetic transient, establishing strong-field recollision as a primary building block for attosecond half-cycle optical field synthesis.</div></div>","PeriodicalId":20172,"journal":{"name":"Physics Letters A","volume":"576 ","pages":"Article 131398"},"PeriodicalIF":2.6,"publicationDate":"2026-04-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146081871","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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}
Pub Date : 2026-04-28Epub Date: 2026-01-25DOI: 10.1016/j.physleta.2026.131412
Jiantao Lü , Yongyao Li
Geometric phase can accumulate on idler or signal waves in four-wave mixing (FWM) when the quasi-phase matching (QPM) vector traces a closed trajectory. Previous studies employing circular modulation paths revealed that the geometric phase is highly sensitive to pump depletion, complicating predictable phase control. In this work, we present two novel QPM modulation schemes implemented within a fully nonlinear FWM framework. The full-wedge rotation guarantees that the geometric phase remains invariant and precisely equals the wedge angle, independent of pump depletion. Conversely, the half-wedge rotation establishes a direct linear relationship between the geometric phase and wedge angle, with the proportionality factor dependent on the pump intensity. These modulation schemes significantly mitigate phase fluctuations under various depletion scenarios and offer a controllable approach to phase manipulation. Our results provide a reliable and versatile method for geometric phase engineering in nonlinear optical systems, opening new avenues for pump-driven all-optical control technologies.
{"title":"Robust control and application of geometric phase in four-wave mixing under wedge trajectory","authors":"Jiantao Lü , Yongyao Li","doi":"10.1016/j.physleta.2026.131412","DOIUrl":"10.1016/j.physleta.2026.131412","url":null,"abstract":"<div><div>Geometric phase can accumulate on idler or signal waves in four-wave mixing (FWM) when the quasi-phase matching (QPM) vector traces a closed trajectory. Previous studies employing circular modulation paths revealed that the geometric phase is highly sensitive to pump depletion, complicating predictable phase control. In this work, we present two novel QPM modulation schemes implemented within a fully nonlinear FWM framework. The full-wedge rotation guarantees that the geometric phase remains invariant and precisely equals the wedge angle, independent of pump depletion. Conversely, the half-wedge rotation establishes a direct linear relationship between the geometric phase and wedge angle, with the proportionality factor dependent on the pump intensity. These modulation schemes significantly mitigate phase fluctuations under various depletion scenarios and offer a controllable approach to phase manipulation. Our results provide a reliable and versatile method for geometric phase engineering in nonlinear optical systems, opening new avenues for pump-driven all-optical control technologies.</div></div>","PeriodicalId":20172,"journal":{"name":"Physics Letters A","volume":"576 ","pages":"Article 131412"},"PeriodicalIF":2.6,"publicationDate":"2026-04-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146081870","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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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