Pub Date : 2025-12-18DOI: 10.1016/j.physleta.2025.131270
Xue Zhang , Ruinian Li , Jiahui Chen , Yan Wang , Yumei Long
This paper studies different types of EPR steering and their corresponding monogamy relations by coupling the coherent states of dynamical Casimir photon pairs in superconducting waveguides. Then, parameter settings are made to create a Gaussian system, and the witnesses for the EPR steering to different modes are derived based on this system. The witnesses are plotted, allowing for a direct observation of the effects of different temperature ratios, amplitude ratios, and coupling coefficient ratios on the generation and ordered sudden death of different types of EPR steering. The findings indicate that manipulating positive and negative coupling coefficients can reverse the direction of EPR steering, allowing for a conversion in the steering party to achieve both type-I and type-II monogamy relations. Additionally, by adjusting the coupling coefficients, the correspondence between the imaginary and real coordinates of a specific coupling coefficient set can be reversed, thereby enabling both parties to steer a third party at the same time and demonstrate the shareability of EPR steering, thus enabling the exchange of type-II monogamy relations. It also allows for the presentation of type-III and type-IV monogamy relations.
{"title":"Multipartite EPR steering and monogamy relations of dynamical Casimir photons in coupled superconducting waveguides","authors":"Xue Zhang , Ruinian Li , Jiahui Chen , Yan Wang , Yumei Long","doi":"10.1016/j.physleta.2025.131270","DOIUrl":"10.1016/j.physleta.2025.131270","url":null,"abstract":"<div><div>This paper studies different types of EPR steering and their corresponding monogamy relations by coupling the coherent states of dynamical Casimir photon pairs in superconducting waveguides. Then, parameter settings are made to create a Gaussian system, and the witnesses for the EPR steering to different modes are derived based on this system. The witnesses are plotted, allowing for a direct observation of the effects of different temperature ratios, amplitude ratios, and coupling coefficient ratios on the generation and ordered sudden death of different types of EPR steering. The findings indicate that manipulating positive and negative coupling coefficients can reverse the direction of EPR steering, allowing for a conversion in the steering party to achieve both type-I and type-II monogamy relations. Additionally, by adjusting the coupling coefficients, the correspondence between the imaginary and real coordinates of a specific coupling coefficient set can be reversed, thereby enabling both parties to steer a third party at the same time and demonstrate the shareability of EPR steering, thus enabling the exchange of type-II monogamy relations. It also allows for the presentation of type-III and type-IV monogamy relations.</div></div>","PeriodicalId":20172,"journal":{"name":"Physics Letters A","volume":"570 ","pages":"Article 131270"},"PeriodicalIF":2.6,"publicationDate":"2025-12-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145841980","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 : 2025-12-17DOI: 10.1016/j.physleta.2025.131266
Junge Gao , Zhengxian Liu , Ling Hong , Zikuan Zhuang , Yu Zhang , Li Zhang , Fei Lin , Jianing Xie , Yongyao Li
The Doppler effect provides a fundamental mechanism for probing motion through frequency shifts, yet direction-resolved rotational Doppler detection remains challenging, especially in the infrared (IR) regime. Here, we present a vector Doppler detection scheme that combines nonlinear optical upconversion with polarization-resolved vectorial metrology to enable full-direction rotational velocimetry. In our approach, the resulting visible SFG field inherits the rotational Doppler shift of the IR signal and simultaneously encodes the rotation direction via a polarization-dependent phase evolution. By implementing dual-channel polarization demodulation, both the magnitude and sign of the angular velocity are extracted without the need for mechanical reference rotation or interferometric stabilization. This architecture effectively shifts the detection burden from the IR detector to the optical front end, offering high robustness and sensitivity. Our results establish a practical pathway for IR-to-visible vectorial Doppler upconversion, expanding the applicability of rotational motion sensing to multidimensional metrology, noncontact diagnostics, and precision navigation.
{"title":"Vector doppler frequency upconversion detection based on orthogonally cascaded BBO crystals","authors":"Junge Gao , Zhengxian Liu , Ling Hong , Zikuan Zhuang , Yu Zhang , Li Zhang , Fei Lin , Jianing Xie , Yongyao Li","doi":"10.1016/j.physleta.2025.131266","DOIUrl":"10.1016/j.physleta.2025.131266","url":null,"abstract":"<div><div>The Doppler effect provides a fundamental mechanism for probing motion through frequency shifts, yet direction-resolved rotational Doppler detection remains challenging, especially in the infrared (IR) regime. Here, we present a vector Doppler detection scheme that combines nonlinear optical upconversion with polarization-resolved vectorial metrology to enable full-direction rotational velocimetry. In our approach, the resulting visible SFG field inherits the rotational Doppler shift of the IR signal and simultaneously encodes the rotation direction via a polarization-dependent phase evolution. By implementing dual-channel polarization demodulation, both the magnitude and sign of the angular velocity are extracted without the need for mechanical reference rotation or interferometric stabilization. This architecture effectively shifts the detection burden from the IR detector to the optical front end, offering high robustness and sensitivity. Our results establish a practical pathway for IR-to-visible vectorial Doppler upconversion, expanding the applicability of rotational motion sensing to multidimensional metrology, noncontact diagnostics, and precision navigation.</div></div>","PeriodicalId":20172,"journal":{"name":"Physics Letters A","volume":"570 ","pages":"Article 131266"},"PeriodicalIF":2.6,"publicationDate":"2025-12-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145841977","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 : 2025-12-17DOI: 10.1016/j.physleta.2025.131263
R. Muthuganesan
Quantum resource theories (QRT) provide a rigorous framework for identifying and quantifying the intrinsic features that distinguish quantum systems from their classical counterparts. Within this framework, we investigate the recently introduced notion of quantum state texture (QST), which characterizes structural irregularities of density matrices and links them to operationally meaningful quantum resources. We develop and analyze new QST measures based on the Hellinger distance, Jensen-Shannon divergence, and Wigner-Yanase-Dyson skew information. These measures are shown to satisfy the axiomatic requirements of faithfulness, monotonicity, and convexity, thereby establishing them as bona fide quantifiers of QST. We further derive bounds relating the Hellinger- and Jensen-Shannon-based measures to fidelity, trace distance, and Bures distance, and demonstrate that the Hellinger-based measure constrains the geometric entanglement of pure states. Additionally, we establish a no-broadcasting theorem for the Jensen-Shannon-based QST, highlighting its operational significance in information-processing tasks. Collectively, our results provide a geometric and information-theoretic foundation for quantifying QST, advancing its role as a fundamental quantum resource with applications in entanglement detection, and resource distribution in multipartite systems.
{"title":"Quantum state texture: Geometric and theoretic information perspective","authors":"R. Muthuganesan","doi":"10.1016/j.physleta.2025.131263","DOIUrl":"10.1016/j.physleta.2025.131263","url":null,"abstract":"<div><div>Quantum resource theories (QRT) provide a rigorous framework for identifying and quantifying the intrinsic features that distinguish quantum systems from their classical counterparts. Within this framework, we investigate the recently introduced notion of quantum state texture (QST), which characterizes structural irregularities of density matrices and links them to operationally meaningful quantum resources. We develop and analyze new QST measures based on the Hellinger distance, Jensen-Shannon divergence, and Wigner-Yanase-Dyson skew information. These measures are shown to satisfy the axiomatic requirements of faithfulness, monotonicity, and convexity, thereby establishing them as bona fide quantifiers of QST. We further derive bounds relating the Hellinger- and Jensen-Shannon-based measures to fidelity, trace distance, and Bures distance, and demonstrate that the Hellinger-based measure constrains the geometric entanglement of pure states. Additionally, we establish a no-broadcasting theorem for the Jensen-Shannon-based QST, highlighting its operational significance in information-processing tasks. Collectively, our results provide a geometric and information-theoretic foundation for quantifying QST, advancing its role as a fundamental quantum resource with applications in entanglement detection, and resource distribution in multipartite systems.</div></div>","PeriodicalId":20172,"journal":{"name":"Physics Letters A","volume":"570 ","pages":"Article 131263"},"PeriodicalIF":2.6,"publicationDate":"2025-12-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145842677","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 : 2025-12-16DOI: 10.1016/j.physleta.2025.131268
Qingji Zeng , Yuyou Yang , Jinyuan Ma , Zeming Liang , Jing Wang , Jiafu Chen , Huapeng Ye , Dianyuan Fan , Shuqing Chen
The relentless pursuit of enhanced holographic capacity—critical for addressing the surging demand for high-density information storage and high-fidelity optical displays—continuously spurs the advancement of multi-dimensional multiplexed holography. Herein, we present a four-dimensional holographic multiplexing strategy that synergistically integrates the radial and azimuthal indices of Laguerre–Gaussian (LG) modes, the rotation state of diffractive neural network layers, and the input polarization. 16 LG modes undergo independent unitary transformations via a three-layer diffractive architecture, while establishing one-to-many hologram mapping across three distinct rotational configurations of the layers. By physically implementing this architecture using cascaded metasurfaces, a pair of helicity-orthogonal channels are incorporated to afford polarization-multiplexed operations. Accordingly, a 96-channel holographic system is constructed with a three-layer rotatable meta-platform, successfully demonstrating high-fidelity hologram generation. This work merges optical and non-optical multiplexing parameters to efficiently expand holographic channel capacity, anticipated to expedite the deployment of advanced high-dimensional optical signal processing and displays.
{"title":"Four-dimensional multiplexed holography using Laguerre-Gaussian modes, rotational diffractive networks, and polarizations","authors":"Qingji Zeng , Yuyou Yang , Jinyuan Ma , Zeming Liang , Jing Wang , Jiafu Chen , Huapeng Ye , Dianyuan Fan , Shuqing Chen","doi":"10.1016/j.physleta.2025.131268","DOIUrl":"10.1016/j.physleta.2025.131268","url":null,"abstract":"<div><div>The relentless pursuit of enhanced holographic capacity—critical for addressing the surging demand for high-density information storage and high-fidelity optical displays—continuously spurs the advancement of multi-dimensional multiplexed holography. Herein, we present a four-dimensional holographic multiplexing strategy that synergistically integrates the radial and azimuthal indices of Laguerre–Gaussian (LG) modes, the rotation state of diffractive neural network layers, and the input polarization. 16 LG modes undergo independent unitary transformations via a three-layer diffractive architecture, while establishing one-to-many hologram mapping across three distinct rotational configurations of the layers. By physically implementing this architecture using cascaded metasurfaces, a pair of helicity-orthogonal channels are incorporated to afford polarization-multiplexed operations. Accordingly, a 96-channel holographic system is constructed with a three-layer rotatable meta-platform, successfully demonstrating high-fidelity hologram generation. This work merges optical and non-optical multiplexing parameters to efficiently expand holographic channel capacity, anticipated to expedite the deployment of advanced high-dimensional optical signal processing and displays.</div></div>","PeriodicalId":20172,"journal":{"name":"Physics Letters A","volume":"570 ","pages":"Article 131268"},"PeriodicalIF":2.6,"publicationDate":"2025-12-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145842548","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 : 2025-12-16DOI: 10.1016/j.physleta.2025.131252
V.S. Karlashchuk, S.V. Petrov
We study the dynamic equations for H2X type molecules with one bending degree of freedom within the framework of the soft body model. The dynamic equations for the components of angular momentum and Euler angles under different initial conditions are numerically integrated. Initially, the tennis racket effect was studied only for rigid spinning tops. Our investigation focuses on the impact of molecular non-rigidity on the tennis racket effect. It was shown that non-rigidity leads to the multi-center nature of the tennis racket effect. Moreover, it was established that non-rigidity also affects the shape of the phase trajectories, making them more curved.
{"title":"Tennis racket effect for nonrigid molecules","authors":"V.S. Karlashchuk, S.V. Petrov","doi":"10.1016/j.physleta.2025.131252","DOIUrl":"10.1016/j.physleta.2025.131252","url":null,"abstract":"<div><div>We study the dynamic equations for H<sub>2</sub>X type molecules with one bending degree of freedom within the framework of the soft body model. The dynamic equations for the components of angular momentum and Euler angles under different initial conditions are numerically integrated. Initially, the tennis racket effect was studied only for rigid spinning tops. Our investigation focuses on the impact of molecular non-rigidity on the tennis racket effect. It was shown that non-rigidity leads to the multi-center nature of the tennis racket effect. Moreover, it was established that non-rigidity also affects the shape of the phase trajectories, making them more curved.</div></div>","PeriodicalId":20172,"journal":{"name":"Physics Letters A","volume":"570 ","pages":"Article 131252"},"PeriodicalIF":2.6,"publicationDate":"2025-12-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145841979","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 : 2025-12-16DOI: 10.1016/j.physleta.2025.131265
Li Bowen, Zhang Feng, Jin Peng
This work introduced a low-electromagnetic-radiation-intensity metasurface based on a composite Octet-Truss lattice structures. The design arranged two resin-matrix lattice unit cells with different volume fractions on a plane in a prescribed sequence. Ten Octet-Truss-derived unit-cell variants with varied volume fractions were first designed and numerically characterized for reflection amplitude and phase, from which two cells with a suitable phase difference were selected. A topology optimization framework was then established, using the in-plane arrangement of these cells as design variables, a genetic algorithm as the optimizer, and minimization of far-field radiation intensity as the objective. The optimized metasurface achieved markedly reduced radiation intensity and effectively suppressed specular reflection relative to conventional designs, demonstrating superior performance for advanced electromagnetic applications.
{"title":"Topology optimization of low-electromagnetic-radiation-intensity metasurface containing octet-truss lattice structures","authors":"Li Bowen, Zhang Feng, Jin Peng","doi":"10.1016/j.physleta.2025.131265","DOIUrl":"10.1016/j.physleta.2025.131265","url":null,"abstract":"<div><div>This work introduced a low-electromagnetic-radiation-intensity metasurface based on a composite Octet-Truss lattice structures. The design arranged two resin-matrix lattice unit cells with different volume fractions on a plane in a prescribed sequence. Ten Octet-Truss-derived unit-cell variants with varied volume fractions were first designed and numerically characterized for reflection amplitude and phase, from which two cells with a suitable phase difference were selected. A topology optimization framework was then established, using the in-plane arrangement of these cells as design variables, a genetic algorithm as the optimizer, and minimization of far-field radiation intensity as the objective. The optimized metasurface achieved markedly reduced radiation intensity and effectively suppressed specular reflection relative to conventional designs, demonstrating superior performance for advanced electromagnetic applications.</div></div>","PeriodicalId":20172,"journal":{"name":"Physics Letters A","volume":"570 ","pages":"Article 131265"},"PeriodicalIF":2.6,"publicationDate":"2025-12-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145841982","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 : 2025-12-15DOI: 10.1016/j.physleta.2025.131267
Barkathulla Asrafali , Fahim Khan , Syam MS , Natesan Yogesh , Suling Shen , Qiang Liu , Zhengbiao Ouyang
We introduce a unidirectional cavity coupler utilizing transformation optics (TO), that enables the transport of unidirectional electromagnetic waves without the use of magnets in a highly mode-selective manner. The proposed cavity enables fundamental, dipole, and higher-order resonances with suppressed back-propagation, facilitated by destructive interference, exploiting spatially engineered permittivity profiles based on the principle of analogous transmission. Simulation results show strong isolation of the forward and reverse excitations. Using this directional confinement, we can rapidly heat a dielectric material placed in the center of the cavity, with dielectric heating: at 4.06 GHz with a z-polarized field of 1000 V/m, the temperature of an alumina (Al2O3) rod at the center of the cavity not only reaches 1602.03 °C in a minute, but also the heating rate becomes 26.8 °C. Such findings point to the future of TO cavities in small, bias-free, electromagnetic wave control and low-power directional heating tool designs.
{"title":"Transformation optical unidirectional cavity for unidirectional heating applications","authors":"Barkathulla Asrafali , Fahim Khan , Syam MS , Natesan Yogesh , Suling Shen , Qiang Liu , Zhengbiao Ouyang","doi":"10.1016/j.physleta.2025.131267","DOIUrl":"10.1016/j.physleta.2025.131267","url":null,"abstract":"<div><div>We introduce a unidirectional cavity coupler utilizing transformation optics (TO), that enables the transport of unidirectional electromagnetic waves without the use of magnets in a highly mode-selective manner. The proposed cavity enables fundamental, dipole, and higher-order resonances with suppressed back-propagation, facilitated by destructive interference, exploiting spatially engineered permittivity profiles based on the principle of analogous transmission. Simulation results show strong isolation of the forward and reverse excitations. Using this directional confinement, we can rapidly heat a dielectric material placed in the center of the cavity, with dielectric heating: at 4.06 GHz with a z-polarized field of 1000 V/m, the temperature of an alumina (Al<sub>2</sub>O<sub>3</sub>) rod at the center of the cavity not only reaches 1602.03 °C in a minute, but also the heating rate becomes 26.8 °C. Such findings point to the future of TO cavities in small, bias-free, electromagnetic wave control and low-power directional heating tool designs.</div></div>","PeriodicalId":20172,"journal":{"name":"Physics Letters A","volume":"569 ","pages":"Article 131267"},"PeriodicalIF":2.6,"publicationDate":"2025-12-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145789351","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 : 2025-12-15DOI: 10.1016/j.physleta.2025.131264
Xiaomin Cheng , Xingxing Xu , Anping Wan , Khalil AL-Bukhaiti , Junjie Jiang , Xiaosheng Ji
Magnetorheological fluid-based microfluidic channels address key limitations of solid-walled systems, including wall contamination, biomolecule adsorption, and high-pressure demands in biochip applications. This study elucidates the formation and stability of the central zero magnetic field line in a quadrupole magnetic source, essential for enabling wall-free fluid flow, define "stability" as the insensitivity of the zero-field line to small practical asymmetries. Integrating theoretical modeling via Biot-Savart law and magnetic superposition principles, ANSYS Maxwell 3D simulations, and experimental validation with four symmetrically arranged electromagnets, we confirm zero magnetic induction along the central axis and elevated intensities near poles. Asymmetric configurations disrupt this zero-field condition, underscoring symmetry's role. Illumination tests with ferroferric oxide powder demonstrate robust, wall-free channel formation under varying currents and pole spacings, with Y-direction intensity decaying rapidly toward the center. These insights align with prior magnetic fluid control studies, offering a theoretical-empirical framework to optimize low-friction, contamination-resistant microfluidic systems for biochips. This study bridges the well-established theory of quadrupole magnets with the emerging need for contamination-resistant microfluidic systems. The paper provides a reproducible framework for designing and validating quadrupole-based microfluidic channels, with emphasis on stability under realistic asymmetric conditions.
{"title":"Formation and stability of zero magnetic field lines in quadrupole magnetic sources for magnetorheological microfluidic systems","authors":"Xiaomin Cheng , Xingxing Xu , Anping Wan , Khalil AL-Bukhaiti , Junjie Jiang , Xiaosheng Ji","doi":"10.1016/j.physleta.2025.131264","DOIUrl":"10.1016/j.physleta.2025.131264","url":null,"abstract":"<div><div>Magnetorheological fluid-based microfluidic channels address key limitations of solid-walled systems, including wall contamination, biomolecule adsorption, and high-pressure demands in biochip applications. This study elucidates the formation and stability of the central zero magnetic field line in a quadrupole magnetic source, essential for enabling wall-free fluid flow, define \"stability\" as the insensitivity of the zero-field line to small practical asymmetries. Integrating theoretical modeling via Biot-Savart law and magnetic superposition principles, ANSYS Maxwell 3D simulations, and experimental validation with four symmetrically arranged electromagnets, we confirm zero magnetic induction along the central axis and elevated intensities near poles. Asymmetric configurations disrupt this zero-field condition, underscoring symmetry's role. Illumination tests with ferroferric oxide powder demonstrate robust, wall-free channel formation under varying currents and pole spacings, with Y-direction intensity decaying rapidly toward the center. These insights align with prior magnetic fluid control studies, offering a theoretical-empirical framework to optimize low-friction, contamination-resistant microfluidic systems for biochips. This study bridges the well-established theory of quadrupole magnets with the emerging need for contamination-resistant microfluidic systems. The paper provides a reproducible framework for designing and validating quadrupole-based microfluidic channels, with emphasis on stability under realistic asymmetric conditions.</div></div>","PeriodicalId":20172,"journal":{"name":"Physics Letters A","volume":"569 ","pages":"Article 131264"},"PeriodicalIF":2.6,"publicationDate":"2025-12-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145789411","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 : 2025-12-15DOI: 10.1016/j.physleta.2025.131198
Ali N.A. Koam , Shahid Chaudhary , Farruh Atamurotov , Ali Ahmad , Ibtisam Masmali
We investigate the gravitational, optical, and dynamical characteristics of regular black holes originating from nonminimally coupled Einstein-Yang-Mills (EYM) theory within the framework of Rainbow gravity. The study is motivated by the need to explore quantum gravity corrections to classical black hole models, particularly through the incorporation of energy-dependent spacetime metrics. By modifying the standard EYM solution with rainbow functions, we consider an interesting family of regular black hole geometries that depend explicitly on the probe energy and introduce a running gravitational coupling. Using the Gauss-Bonnet topological method, we derive analytical expressions for the weak deflection angle of light, revealing that both the Rainbow gravity parameter λ and the Yang-Mills coupling constant q significantly enhance gravitational lensing. The analysis is extended to include plasma effects, demonstrating that the frequency-dependent refractive index alters the deflection profile and introduces chromatic dispersion. Furthermore, we adopt the Jacobi geometry approach to evaluate the deflection of massive particles and show that the deformation parameter λ, particle velocity v, and gauge coupling q intricately modulate particle trajectories. We also examine the impact of these modifications on observable features such as accretion disk images and black hole shadows. Utilizing the Novikov-Thorne thin disk model and static spherical accretion framework, we obtain accretion disk and photon rings. The results show that increasing λ and q leads to a decrease in shadow size, an enhancement in brightness, and greater distortion of secondary images-effects that arise due to intensified spacetime curvature near the black hole.
{"title":"Effects of gravitational lensing onto accretion disk and shadow images of regular black holes in rainbow gravity","authors":"Ali N.A. Koam , Shahid Chaudhary , Farruh Atamurotov , Ali Ahmad , Ibtisam Masmali","doi":"10.1016/j.physleta.2025.131198","DOIUrl":"10.1016/j.physleta.2025.131198","url":null,"abstract":"<div><div>We investigate the gravitational, optical, and dynamical characteristics of regular black holes originating from nonminimally coupled Einstein-Yang-Mills (EYM) theory within the framework of Rainbow gravity. The study is motivated by the need to explore quantum gravity corrections to classical black hole models, particularly through the incorporation of energy-dependent spacetime metrics. By modifying the standard EYM solution with rainbow functions, we consider an interesting family of regular black hole geometries that depend explicitly on the probe energy and introduce a running gravitational coupling. Using the Gauss-Bonnet topological method, we derive analytical expressions for the weak deflection angle of light, revealing that both the Rainbow gravity parameter <em>λ</em> and the Yang-Mills coupling constant <em>q</em> significantly enhance gravitational lensing. The analysis is extended to include plasma effects, demonstrating that the frequency-dependent refractive index alters the deflection profile and introduces chromatic dispersion. Furthermore, we adopt the Jacobi geometry approach to evaluate the deflection of massive particles and show that the deformation parameter <em>λ</em>, particle velocity <em>v</em>, and gauge coupling <em>q</em> intricately modulate particle trajectories. We also examine the impact of these modifications on observable features such as accretion disk images and black hole shadows. Utilizing the Novikov-Thorne thin disk model and static spherical accretion framework, we obtain accretion disk and photon rings. The results show that increasing <em>λ</em> and <em>q</em> leads to a decrease in shadow size, an enhancement in brightness, and greater distortion of secondary images-effects that arise due to intensified spacetime curvature near the black hole.</div></div>","PeriodicalId":20172,"journal":{"name":"Physics Letters A","volume":"568 ","pages":"Article 131198"},"PeriodicalIF":2.6,"publicationDate":"2025-12-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145788355","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 : 2025-12-15DOI: 10.1016/j.physleta.2025.131271
Samad Roshan Entezar
This study presents the design and analysis of a one-dimensional (1D) topological photonic crystal (PC) formed by interfacing two distinct 1D PCs, PC1 and PC2, with unit cell configurations ABA and B′A′B′, respectively, composed of epsilon-negative (ENG) and mu-negative (MNG) single-negative (SNG) metamaterials. By tuning the layer thicknesses, the photonic band structures of PC1 and PC2 are engineered to exhibit opposite topological properties, resulting in a robust topological edge state (TES) at their interface. This TES, arising from a Zak phase discontinuity, is protected against backscattering and persists under moderate structural perturbations, enabling applications in defect-immune waveguiding and field confinement. Using transfer matrix method (TMM), we demonstrate overlapping photonic band gaps (PBGs) with opposite reflection phases, confirming the TES condition. Numerical simulations reveal two high-quality TESs at 4.473 GHz and 8.267 GHz within the first and third PBGs, respectively, with strong localization and high transmission, even in the presence of damping and geometric disorder. The low-frequency TES exhibits greater resilience to incident-angle variations and perturbations compared to the high-frequency counterpart, particularly for TM polarization. These findings highlight the potential of ENG/MNG-based topological PCs for compact, reconfigurable photonic circuits, high-Q resonators, and robust microwave or terahertz devices.
本研究设计和分析了一种一维（1D）拓扑光子晶体（PC），该晶体由两个不同的一维光子晶体PC1和PC2连接而成，分别具有单晶构型ABA和B ' a ' B '，由负ε (ENG)和负mu （MNG）单负（SNG）超材料组成。通过调整层厚度，PC1和PC2的光子带结构被设计成具有相反的拓扑特性，从而在它们的界面处产生鲁棒的拓扑边缘态（TES）。这种由Zak相位不连续产生的TES可以防止后向散射，并在适度的结构扰动下持续存在，从而可以应用于缺陷免疫波导和场约束。利用传输矩阵法（TMM），我们展示了具有相反反射相位的重叠光子带隙（PBGs），证实了TES条件。数值模拟结果表明，在第一和第三PBGs中，分别在4.473 GHz和8.267 GHz处存在两个高质量的TESs，即使存在阻尼和几何紊乱，也具有强局域化和高传输。与高频对应物相比，低频TES对入射角变化和扰动表现出更大的弹性，特别是对于TM极化。这些发现突出了基于ENG/ mg的拓扑pc在紧凑、可重构光子电路、高q谐振器和鲁棒微波或太赫兹器件方面的潜力。
{"title":"Topological edge states in single-negative metamaterial photonic crystals","authors":"Samad Roshan Entezar","doi":"10.1016/j.physleta.2025.131271","DOIUrl":"10.1016/j.physleta.2025.131271","url":null,"abstract":"<div><div>This study presents the design and analysis of a one-dimensional (1D) topological photonic crystal (PC) formed by interfacing two distinct 1D PCs, PC1 and PC2, with unit cell configurations ABA and B′A′B′, respectively, composed of epsilon-negative (ENG) and mu-negative (MNG) single-negative (SNG) metamaterials. By tuning the layer thicknesses, the photonic band structures of PC1 and PC2 are engineered to exhibit opposite topological properties, resulting in a robust topological edge state (TES) at their interface. This TES, arising from a Zak phase discontinuity, is protected against backscattering and persists under moderate structural perturbations, enabling applications in defect-immune waveguiding and field confinement. Using transfer matrix method (TMM), we demonstrate overlapping photonic band gaps (PBGs) with opposite reflection phases, confirming the TES condition. Numerical simulations reveal two high-quality TESs at 4.473 GHz and 8.267 GHz within the first and third PBGs, respectively, with strong localization and high transmission, even in the presence of damping and geometric disorder. The low-frequency TES exhibits greater resilience to incident-angle variations and perturbations compared to the high-frequency counterpart, particularly for TM polarization. These findings highlight the potential of ENG/MNG-based topological PCs for compact, reconfigurable photonic circuits, high-Q resonators, and robust microwave or terahertz devices.</div></div>","PeriodicalId":20172,"journal":{"name":"Physics Letters A","volume":"569 ","pages":"Article 131271"},"PeriodicalIF":2.6,"publicationDate":"2025-12-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145789350","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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