Pub Date : 2026-01-27DOI: 10.1016/j.physleta.2026.131413
Akhtar Munir , Muqaddar Abbas , Zia Uddin , Shi-Hai Dong , Chunfang Wang
We propose a theoretical study of the Goos-Hänchen (GH) shift in a cavity magnomechanical setup with a yttrium iron garnet (YIG) sphere placed within an optical cavity. The bias magnetic field induces magnon modes in the sphere. These magnons interact with cavity photons through the magnetic dipole interaction and with mechanical vibrations via the magnetostrictive effect. By investigating the hybrid magnon-photon modes, we notice two coupling regimes: level repulsion associated with coherent magnon-photon coupling and level attraction associated with dissipative coupling, which results in the formation of exceptional points. Using a transfer matrix technique, we examine the GH shift of the reflected probe beam and show that level repulsion causes positive lateral shifts, whereas level attraction causes significant negative shifts. The GH shift sign switched via magnon-photon and magnon-phonon couplings, enabling non-Hermitian photonics interfaces and sensitive sensors through level repulsion and attraction.
{"title":"Exceptional-point control of the Goos-Hänchen shift in a cavity magnomechanics","authors":"Akhtar Munir , Muqaddar Abbas , Zia Uddin , Shi-Hai Dong , Chunfang Wang","doi":"10.1016/j.physleta.2026.131413","DOIUrl":"10.1016/j.physleta.2026.131413","url":null,"abstract":"<div><div>We propose a theoretical study of the Goos-Hänchen (GH) shift in a cavity magnomechanical setup with a yttrium iron garnet (YIG) sphere placed within an optical cavity. The bias magnetic field induces magnon modes in the sphere. These magnons interact with cavity photons through the magnetic dipole interaction and with mechanical vibrations via the magnetostrictive effect. By investigating the hybrid magnon-photon modes, we notice two coupling regimes: level repulsion associated with coherent magnon-photon coupling and level attraction associated with dissipative coupling, which results in the formation of exceptional points. Using a transfer matrix technique, we examine the GH shift of the reflected probe beam and show that level repulsion causes positive lateral shifts, whereas level attraction causes significant negative shifts. The GH shift sign switched via magnon-photon and magnon-phonon couplings, enabling non-Hermitian photonics interfaces and sensitive sensors through level repulsion and attraction.</div></div>","PeriodicalId":20172,"journal":{"name":"Physics Letters A","volume":"575 ","pages":"Article 131413"},"PeriodicalIF":2.6,"publicationDate":"2026-01-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146081206","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 : 2026-01-27DOI: 10.1016/j.physleta.2026.131397
Dongming Liu , Dexin Xia , Tingting Lv , Jian Han , Bing Yu , Jinhui Shi
Integrating switchable and multiple functionalities into a single metasurface is crucial in optical anti-counterfeiting, information multiplexing, and augmented/virtual reality. However, most efforts have focused on functional diversification, making it challenging to balance bandwidth and efficiency. Here, we demonstrate a full-space hybrid metasurface that may implement versatile polarization manipulation by controlling the Fermi level of graphene. The bianisotropic metasurface exhibits high-efficiency dual-broadband asymmetric transmission. Both the preservation and conversion of handedness are simultaneously achieved in adjacent broadband regimes. The underlying physical mechanisms are elucidated through Fabry-Perot-like resonance and near-field distribution. Furthermore, the angular dependence of multiple polarization properties is investigated. The proposed hybrid metasurface enables full-space, high-efficiency and broadband manipulation of circularly polarized waves, facilitating advances in information multiplexing, polarization-sensitive imaging, and encryption.
{"title":"Versatile terahertz metasurface integrated graphene with dual-polarization asymmetric transmission and reflective dual-broadband polarization manipulation of circularly polarized waves","authors":"Dongming Liu , Dexin Xia , Tingting Lv , Jian Han , Bing Yu , Jinhui Shi","doi":"10.1016/j.physleta.2026.131397","DOIUrl":"10.1016/j.physleta.2026.131397","url":null,"abstract":"<div><div>Integrating switchable and multiple functionalities into a single metasurface is crucial in optical anti-counterfeiting, information multiplexing, and augmented/virtual reality. However, most efforts have focused on functional diversification, making it challenging to balance bandwidth and efficiency. Here, we demonstrate a full-space hybrid metasurface that may implement versatile polarization manipulation by controlling the Fermi level of graphene. The bianisotropic metasurface exhibits high-efficiency dual-broadband asymmetric transmission. Both the preservation and conversion of handedness are simultaneously achieved in adjacent broadband regimes. The underlying physical mechanisms are elucidated through Fabry-Perot-like resonance and near-field distribution. Furthermore, the angular dependence of multiple polarization properties is investigated. The proposed hybrid metasurface enables full-space, high-efficiency and broadband manipulation of circularly polarized waves, facilitating advances in information multiplexing, polarization-sensitive imaging, and encryption.</div></div>","PeriodicalId":20172,"journal":{"name":"Physics Letters A","volume":"575 ","pages":"Article 131397"},"PeriodicalIF":2.6,"publicationDate":"2026-01-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146081207","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 : 2026-01-26DOI: 10.1016/j.physleta.2026.131420
Olcay Altıntaş , Halil Paşalıoğlu
This study presents a high performance broadband microwave absorber utilizing a combination of Halvorsen chaotic trajectories and Julia fractal geometries. By integrating screen-printed resistive ink into a compact, single-layer resonator design, we achieve over 90% absorption efficiency across a continuous 15–40 GHz spectrum. The proposed structure demonstrates exceptional monostatic Radar Cross Section (RCS) reduction, reaching a peak attenuation of 25 dBsm compared to a perfect electric conductor (PEC). Optimization of chaotic control parameters and substrate thickness ensures robust performance. The polarization angle independency from 0° to 90° and incident angle independency up to 40° is maintained. Experimental results, supported by electric field and surface current analysis, validate the effectiveness for complex electromagnetic environments, offering a scalable solution for advanced stealth and aerospace applications.
{"title":"Monostatic RCS analysis of a microwave absorber using Halvorsen chaotic technique and resistive ink","authors":"Olcay Altıntaş , Halil Paşalıoğlu","doi":"10.1016/j.physleta.2026.131420","DOIUrl":"10.1016/j.physleta.2026.131420","url":null,"abstract":"<div><div>This study presents a high performance broadband microwave absorber utilizing a combination of Halvorsen chaotic trajectories and Julia fractal geometries. By integrating screen-printed resistive ink into a compact, single-layer resonator design, we achieve over 90% absorption efficiency across a continuous 15–40 GHz spectrum. The proposed structure demonstrates exceptional monostatic Radar Cross Section (RCS) reduction, reaching a peak attenuation of 25 dBsm compared to a perfect electric conductor (PEC). Optimization of chaotic control parameters and substrate thickness ensures robust performance. The polarization angle independency from 0° to 90° and incident angle independency up to 40° is maintained. Experimental results, supported by electric field and surface current analysis, validate the effectiveness for complex electromagnetic environments, offering a scalable solution for advanced stealth and aerospace applications.</div></div>","PeriodicalId":20172,"journal":{"name":"Physics Letters A","volume":"573 ","pages":"Article 131420"},"PeriodicalIF":2.6,"publicationDate":"2026-01-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146079989","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 : 2026-01-25DOI: 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":"2026-01-25","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}
Pub Date : 2026-01-24DOI: 10.1016/j.physleta.2026.131410
Wanqiu Yu , Yaming Sun , Yanxiang Sun , XingWang Liu , Pingli Zhang
The study of Cu clusters is a critical research topic in the field of Fe-based nanocrystalline alloys. Herein, nanocrystalline Fe40.5Co40.5Zr7Mo2B9Cu1 alloys were prepared by annealing an as-quenched alloy. The first onset crystallization temperature (Tx1), first crystallization peak temperature (Tp1), second onset crystallization temperature (Tx2), and second crystallization peak temperature (Tp2) determined by differential scanning calorimetry were selected as annealing temperatures. The alloy subjected to annealing was investigated in terms of microstructural evolution and magnetic properties, such as Cu-specific differences between the as-quenched sample and those annealed at Tp1 and Tp2. The as-quenched alloy was amorphous and featured a uniform elemental distribution and composition comparable with the nominal one. In the alloy annealed at Tp1, the Co content of nanocrystals was similar to that of the residual amorphous matrix, whereas the Cu distribution was heterogeneous and characterized by clusters with sizes less than 7 nm. The alloy annealed at Tp2 exhibited fewer but larger Cu clusters and higher Co contents in Fe-deficient areas. Furthermore, lower Co contents were observed in Fe(Co) grains, and Cu nanocrystals were not detected by transmission electron microscopy. With increasing temperature, coercivity decreased and then increased, whereas specific saturation magnetization increased and then decreased.
{"title":"Microstructural evolution and magnetic properties of nanocrystalline iron-cobalt-zirconium-molybdenum-boron-copper alloy","authors":"Wanqiu Yu , Yaming Sun , Yanxiang Sun , XingWang Liu , Pingli Zhang","doi":"10.1016/j.physleta.2026.131410","DOIUrl":"10.1016/j.physleta.2026.131410","url":null,"abstract":"<div><div>The study of Cu clusters is a critical research topic in the field of Fe-based nanocrystalline alloys. Herein, nanocrystalline Fe<sub>40.5</sub>Co<sub>40.5</sub>Zr<sub>7</sub>Mo<sub>2</sub>B<sub>9</sub>Cu<sub>1</sub> alloys were prepared by annealing an as-quenched alloy. The first onset crystallization temperature (<em>T</em><sub>x1</sub>), first crystallization peak temperature (<em>T</em><sub>p1</sub>), second onset crystallization temperature (<em>T</em><sub>x2</sub>), and second crystallization peak temperature (<em>T</em><sub>p2</sub>) determined by differential scanning calorimetry were selected as annealing temperatures. The alloy subjected to annealing was investigated in terms of microstructural evolution and magnetic properties, such as Cu-specific differences between the as-quenched sample and those annealed at <em>T</em><sub>p1</sub> and <em>T</em><sub>p2</sub>. The as-quenched alloy was amorphous and featured a uniform elemental distribution and composition comparable with the nominal one. In the alloy annealed at <em>T</em><sub>p1</sub>, the Co content of nanocrystals was similar to that of the residual amorphous matrix, whereas the Cu distribution was heterogeneous and characterized by clusters with sizes less than 7 nm. The alloy annealed at <em>T</em><sub>p2</sub> exhibited fewer but larger Cu clusters and higher Co contents in Fe-deficient areas. Furthermore, lower Co contents were observed in Fe(Co) grains, and Cu nanocrystals were not detected by transmission electron microscopy. With increasing temperature, coercivity decreased and then increased, whereas specific saturation magnetization increased and then decreased.</div></div>","PeriodicalId":20172,"journal":{"name":"Physics Letters A","volume":"575 ","pages":"Article 131410"},"PeriodicalIF":2.6,"publicationDate":"2026-01-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146081006","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 : 2026-01-24DOI: 10.1016/j.physleta.2026.131407
Yu Yan , Kai-Xin Hu , Shutian Liu , Wen-Xue Cui , Ji Cao , Shou Zhang , Hong-Fu Wang
We investigate the non-Hermitian dimerized Kitaev model with intracell and intercell nonreciprocal hopping. In the Hermitian case, the topologically nontrivial phase region expands with increasing on-site potentials when the two sublattices have the same sign, but shrinks when their signs differ. When nonreciprocal hopping is introduced and on-site potentials share the same sign, the topologically nontrivial phase region gradually narrows as the nonreciprocity grows, accompanied by the emergence of the non-Hermitian skin effect–mainly dominated by intracell nonreciprocity. The skin direction characterized by the spectral winding number, correlates with the real part of the energy spectrum, which displays a Z2 character protected by particle-hole symmetry. Conversely, when on-site potentials have opposite signs, the topological phase region widens with increasing nonreciprocity up to a critical value, beyond which it splits into two branches. Notably, the skin effect vanishes because opposite on-site potentials induce skin effects in opposing directions, balancing the system and allowing a topological phase to emerge. Our result provides a strategy for controlling the appearance and disappearance of the non-Hermitian skin effect by tuning on-site potentials in dimerized topological superconductors.
{"title":"Topological phase and skin effect in a non-Hermitian dimerized Kitaev model","authors":"Yu Yan , Kai-Xin Hu , Shutian Liu , Wen-Xue Cui , Ji Cao , Shou Zhang , Hong-Fu Wang","doi":"10.1016/j.physleta.2026.131407","DOIUrl":"10.1016/j.physleta.2026.131407","url":null,"abstract":"<div><div>We investigate the non-Hermitian dimerized Kitaev model with intracell and intercell nonreciprocal hopping. In the Hermitian case, the topologically nontrivial phase region expands with increasing on-site potentials when the two sublattices have the same sign, but shrinks when their signs differ. When nonreciprocal hopping is introduced and on-site potentials share the same sign, the topologically nontrivial phase region gradually narrows as the nonreciprocity grows, accompanied by the emergence of the non-Hermitian skin effect–mainly dominated by intracell nonreciprocity. The skin direction characterized by the spectral winding number, correlates with the real part of the energy spectrum, which displays a Z<sub>2</sub> character protected by particle-hole symmetry. Conversely, when on-site potentials have opposite signs, the topological phase region widens with increasing nonreciprocity up to a critical value, beyond which it splits into two branches. Notably, the skin effect vanishes because opposite on-site potentials induce skin effects in opposing directions, balancing the system and allowing a topological phase to emerge. Our result provides a strategy for controlling the appearance and disappearance of the non-Hermitian skin effect by tuning on-site potentials in dimerized topological superconductors.</div></div>","PeriodicalId":20172,"journal":{"name":"Physics Letters A","volume":"575 ","pages":"Article 131407"},"PeriodicalIF":2.6,"publicationDate":"2026-01-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146081002","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}
High energy density materials (HEDMs) are crucial in explosives and energy storage fields. The conversion of N-N and N=N bonds to NN is associated with substantial energy release, and polymeric nitrogen stands out as a promising HEDMs candidate owing to its abundant N-N and N=N bonds. However, polymeric nitrogen typically exhibits poor stability under ambient conditions. Applying high pressure and introducing coordinating elements are two proven strategies to enhance its stability. Herein, we explored the InN6 compounds via crystal structure prediction approach and identify two dynamically stable phases within the pressure range of 0 - 100 GPa. Notably, the ɑ-P-1-InN6 phase demonstrates exceptional performance, featuring a high volumetric energy density (Ev = 18.33 kJ/cm3), high detonation pressure (Pd = 264.96 GPa), and superior detonation velocity (Vd = 34.57 km/s). These outstanding properties endow ɑ-P-1-InN6 with great application potential in energy storage and explosive manufacturing.
{"title":"Investigation of high energy density InN₆ compounds under high pressure","authors":"Yongju Dang , Xing Sun , Haizhou Wang, Jinyu Liu, Dandan Zhang, Lili Gao, Miao Zhang","doi":"10.1016/j.physleta.2026.131415","DOIUrl":"10.1016/j.physleta.2026.131415","url":null,"abstract":"<div><div>High energy density materials (HEDMs) are crucial in explosives and energy storage fields. The conversion of N-N and N=N bonds to N<img>N is associated with substantial energy release, and polymeric nitrogen stands out as a promising HEDMs candidate owing to its abundant N-N and N=N bonds. However, polymeric nitrogen typically exhibits poor stability under ambient conditions. Applying high pressure and introducing coordinating elements are two proven strategies to enhance its stability. Herein, we explored the InN<sub>6</sub> compounds via crystal structure prediction approach and identify two dynamically stable phases within the pressure range of 0 - 100 GPa. Notably, the ɑ-<em>P</em>-1-InN<sub>6</sub> phase demonstrates exceptional performance, featuring a high volumetric energy density (E<sub>v</sub> = 18.33 kJ/cm<sup>3</sup>), high detonation pressure (P<sub>d</sub> = 264.96 GPa), and superior detonation velocity (V<sub>d</sub> = 34.57 km/s). These outstanding properties endow ɑ-<em>P</em>-1-InN<sub>6</sub> with great application potential in energy storage and explosive manufacturing.</div></div>","PeriodicalId":20172,"journal":{"name":"Physics Letters A","volume":"575 ","pages":"Article 131415"},"PeriodicalIF":2.6,"publicationDate":"2026-01-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146081008","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 : 2026-01-24DOI: 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":"2026-01-24","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 : 2026-01-24DOI: 10.1016/j.physleta.2026.131414
Qing Zeng , Wenhui Xu , Hang Xu , Hui Li , Jianquan Yao
Dynamically reconfigurable metasurfaces for terahertz (THz) wavefront control are highly desirable for advanced communication, imaging, and sensing systems. Here, we propose a cascaded all-dielectric metasurface that enables continuously tunable beam steering through a Moiré phase-superposition mechanism. Two closely stacked 2-bit silicon coding layers generate programmable composite phase profiles under relative mechanical rotation. Counter-rotation produces a one-dimensional effective phase gradient, allowing continuous single-beam steering within ±50° at the design frequency in the yoz plane, whereas only single-layer rotation produces coupled x-y phase gradients, thereby enabling two-dimensional steering with an azimuthal tuning range of ±45°. The simulated steering characteristics exhibit excellent agreement with analytical predictions, with consistently high transmission efficiency and stable main-lobe amplitude across the full tuning range. This compact and reconfigurable cascaded architecture provides an efficient route toward wide-range, continuous, and high-performance THz beam manipulation via simple mechanical actuation.
{"title":"Moiré-enabled continuously tunable beam steering in cascaded all-dielectric terahertz metasurfaces","authors":"Qing Zeng , Wenhui Xu , Hang Xu , Hui Li , Jianquan Yao","doi":"10.1016/j.physleta.2026.131414","DOIUrl":"10.1016/j.physleta.2026.131414","url":null,"abstract":"<div><div>Dynamically reconfigurable metasurfaces for terahertz (THz) wavefront control are highly desirable for advanced communication, imaging, and sensing systems. Here, we propose a cascaded all-dielectric metasurface that enables continuously tunable beam steering through a Moiré phase-superposition mechanism. Two closely stacked 2-bit silicon coding layers generate programmable composite phase profiles under relative mechanical rotation. Counter-rotation produces a one-dimensional effective phase gradient, allowing continuous single-beam steering within ±50° at the design frequency in the <em>yoz</em> plane, whereas only single-layer rotation produces coupled <em>x</em>-<em>y</em> phase gradients, thereby enabling two-dimensional steering with an azimuthal tuning range of ±45°. The simulated steering characteristics exhibit excellent agreement with analytical predictions, with consistently high transmission efficiency and stable main-lobe amplitude across the full tuning range. This compact and reconfigurable cascaded architecture provides an efficient route toward wide-range, continuous, and high-performance THz beam manipulation via simple mechanical actuation.</div></div>","PeriodicalId":20172,"journal":{"name":"Physics Letters A","volume":"575 ","pages":"Article 131414"},"PeriodicalIF":2.6,"publicationDate":"2026-01-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146081073","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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