Optical orbital angular momentum(OAM)mode multiplexing has emerged as a promising technique for boosting communication capacity.However,most existing studies have concentrated on channel(de)-multiplexing,overlooking t...Optical orbital angular momentum(OAM)mode multiplexing has emerged as a promising technique for boosting communication capacity.However,most existing studies have concentrated on channel(de)-multiplexing,overlooking the critical aspect of channel routing.This challenge involves the reallocation of multiplexed OAM modes across both spatial and temporal domains—a vital step for developing versatile communication networks.To address this gap,we introduce a novel approach based on the time evolution of OAM modes,utilizing the orthogonal conversion and diffractive modulation capabilities of unitary transformations.This approach facilitates high-dimensional orthogonal transformations of OAM mode vectors,altering both the propagation direction and the spatial location.Using Fresnel diffraction matrices as unitary operators,it manipulates the spatial locations of light beams during transmission,breaking the propagation invariance and enabling temporal evolution.As a demonstration,we have experimentally implemented the deep routing of four OAM modes within two distinct time sequences.Achieving an average diffraction efficiency above 78.31%,we have successfully deep-routed 4.69 Tbit-s^(-1)quadrature phase-shift keying(QPSK)signals carried by four multiplexed OAM channels,with a bit error rate below 10^(-6).These results underscore the efficacy of our routing strategy and its promising prospects for practical applications.展开更多
Bio-asphalt has a great application prospect in the replacement of petroleum-based asphalt to pave and maintain asphalt pavement. However, the problems of flow-induced crystallization and phase separation caused by fl...Bio-asphalt has a great application prospect in the replacement of petroleum-based asphalt to pave and maintain asphalt pavement. However, the problems of flow-induced crystallization and phase separation caused by flowinduced crystallization had severely restricted its application. This paper describes the progress of research on preparation, property evaluation and phase separation mechanism of bio-asphalt. The advantages and disadvantages of preparation methods of bio-asphalt are states. The fundamental physical and rheological properties of bio-asphalt are investigated, especially for flow-induced crystallization. There exists obvious flow-induced crystallization because bio-asphalt is rich in waxes that crystallize easily. Owing to the existence of excess biochar,bio-asphalt appears phase separation. A brief review of the effect of bio-oil and biochar on asphalt volatile organic compounds(VOCs) is presented. Research find that bio-oil/biochar are not only replenish the light components of asphalt, but also improve the flow-induced crystallization and phase separation of bio-asphalt. There exists synergistic effect of biochar and bio-oil in asphalt modification. Moreover, biochar can improve the durability of bio-oil modified asphalt, but excessive addition of biochar to bio-oil modified asphalt can cause phase separation.Adding an appropriate amount of bio-oil and biochar to asphalt can improve its high-temperature resistance, lowtemperature crack resistance, and system compatibility.展开更多
We report tunable in-plane shifts of the photonic spin Hall effect(PSHE)for Laguerre-Gauss mode(LGM)at the glass-air interface coated with a ReS_(2)-graphene heterostructure(HS).It is found that the in-plane shifts of...We report tunable in-plane shifts of the photonic spin Hall effect(PSHE)for Laguerre-Gauss mode(LGM)at the glass-air interface coated with a ReS_(2)-graphene heterostructure(HS).It is found that the in-plane shifts of PSHE can be effectively modulated by altering the topological charge of the incident LGM and the rotation angle of the ReS_(2)near the critical angle.Interestingly,we find anomalous enhanced in-plane shifts of PSHE far from the critical angle with specific polarization angles,which rise from the sharp decrease of the reflection coefficient for the circularly polarized components.Our results will provide useful insight for the adjustment of the in-plane shifts of PSHE.展开更多
The efficiency of the photonic spin Hall effect(PSHE)has attracted increasing attention,as it plays a key role in the development of spin-selective devices.However,highly efficient enhancement of PSHE has always been ...The efficiency of the photonic spin Hall effect(PSHE)has attracted increasing attention,as it plays a key role in the development of spin-selective devices.However,highly efficient enhancement of PSHE has always been achieved at a single wavelength.Here,we propose a method to achieve highly efficient enhancement of the photonic spin Hall effect over a broadband operating wavelength by utilizing a magnetic dipole quasibounded state in the continuum(q-MDBIC)with a high refractive index.Under both horizontal and vertical polarization incidence,when the wavelength is 50.9–51.9μm and the incident angle is 0.5°–10°,the transverse shift of PSHE can reach 1.7λ–37λ,with high efficiency of more than 90%.Meanwhile,the quality(Q)factor can also be maintained around 55.Furthermore,different metasurface lattice periods can achieve different broadband PSHE,which provides favorable conditions for the control of broadband PSHE.Our work will have wide applications in devices with efficient spin selection.展开更多
The photonic spin Hall effect(SHE)in the reflection and refraction at an interface is very weak because of the weak spin-orbit interaction.Here,we report the observation of a giant photonic SHE in a dielectric-based m...The photonic spin Hall effect(SHE)in the reflection and refraction at an interface is very weak because of the weak spin-orbit interaction.Here,we report the observation of a giant photonic SHE in a dielectric-based metamaterial.The metamaterial is structured to create a coordinate-dependent,geometric Pancharatnam–Berry phase that results in an SHE with a spin-dependent splitting in momentum space.It is unlike the SHE that occurs in real space in the reflection and refraction at an interface,which results from the momentum-dependent gradient of the geometric Rytov–Vladimirskii–Berry phase.We theorize a unified description of the photonic SHE based on the two types of geometric phase gradient,and we experimentally measure the giant spin-dependent shift of the beam centroid produced by the metamaterial at a visible wavelength.Our results suggest that the structured metamaterial offers a potential method of manipulating spin-polarized photons and the orbital angular momentum of light and thus enables applications in spin-controlled nanophotonics.展开更多
Photonic spin Hall efect(SHE)provides new opportunities for achieving spin-based photonics applications.However,flexibly manipulating the spin-dependent sltting(SDS)of photonic SHE and imposing extra phase modulation ...Photonic spin Hall efect(SHE)provides new opportunities for achieving spin-based photonics applications.However,flexibly manipulating the spin-dependent sltting(SDS)of photonic SHE and imposing extra phase modulation on the two spin components are always a challenge.Here,a controllable SHE mechanism based on phase function construction is reported.It is conduded that the phases with specific functional structures performing a coordinate translation are equivalent to integrating a gradient phase to the original phases.Hence,the original phase can be used for independent phase modulation,and the gradient phase originating from the co-ordinate translation is capable of manipulating the SDS.A metasurface with Pancharatnam-Berry phase that can impose conjugate phases to the two spin components of light is fabricated to verify this mechanism.By shifing the light position,the SDS is continuously manipulated in the visible region,which is successfully used for detecting the polarization llipticity.The extra phase modulation is also performed with the original phase and thus enables measuring singular beams.It is anticipated that the controllable SHE manipulation method may open new avenues in the fields of spin photonics,optical sensing,optical communications,etc.展开更多
Vortex beam with fractional orbital angular momentum (FOAM) is the excellent candidate for improving the capacity of free-space optical (FSO) communication system due to its infinite modes. Therefore, the recognition ...Vortex beam with fractional orbital angular momentum (FOAM) is the excellent candidate for improving the capacity of free-space optical (FSO) communication system due to its infinite modes. Therefore, the recognition of FOAM modes with higher resolution is always of great concern. In this work, through an improved EfficientNetV2 based convolutional neural network (CNN), we experimentally achieve the implementation of the recognition of FOAM modes with a resolution as high as 0.001. To the best of our knowledge, it is the first time this high resolution has been achieved. Under the strong atmospheric turbulence (AT) (C_(n)^(2)=10^(-15)m^(-2/3)), the recognition accuracy of FOAM modes at 0.1 and 0.01 resolution with our model is up to 99.12% and 92.24% for a long transmission distance of 2000 m. Even for the resolution at 0.001, the recognition accuracy can still remain at 78.77%. This work provides an effective method for the recognition of FOAM modes, which may largely improve the channel capacity of the free-space optical communication.展开更多
In this paper,we examine the tiny polarization rotation effect in total internal reflection due to the spin–orbit interaction of light.We find that the tiny polarization rotation rate will induce a geometric phase gr...In this paper,we examine the tiny polarization rotation effect in total internal reflection due to the spin–orbit interaction of light.We find that the tiny polarization rotation rate will induce a geometric phase gradient,which can be regarded as the physical origin of photonic spin Hall effect.We demonstrate that the spin-dependent splitting in position space is related to the polarization rotation in momentum space,while the spin-dependent splitting in momentum space is attributed to the polarization rotation in position space.Furthermore,we introduce a quantum weak measurement to determine the tiny polarization rotation rate.The rotation rate in momentum space is obtained with 118 nm,which manifests itself as a spatial shift,and the rotation rate in position space is achieved with 38 μrad∕λ,which manifests itself as an angular shift.The investigation of the polarization rotation characteristics will provide insights into the photonic spin Hall effect and will enable us to better understand the spin–orbit interaction of light.展开更多
Effective-medium theory pertains to the theoretical modelling of homogenization,which aims to replace an inhomogeneous structure of subwavelength-scale constituents with a homogeneous effective medium.The effective-me...Effective-medium theory pertains to the theoretical modelling of homogenization,which aims to replace an inhomogeneous structure of subwavelength-scale constituents with a homogeneous effective medium.The effective-medium theory is fundamental to various realms,including electromagnetics and material science,since it can largely decrease the complexity in the exploration of light-matter interactions by providing simple acceptable approximation.Generally,the effective-medium theory is thought to be applicable to any all-dielectric system with deep-subwavelength constituents,under the condition that the effective medium does not have a critical angle,at which the total internal reflection occurs.Here we reveal a fundamental breakdown of the effective-medium theory that can be applied in very general conditions:showing it for deep-subwavelength all-dielectric multilayers even without a critical angle.Our finding relies on an exotic photonic spin Hall effect,which is shown to be ultrasensitive to the stacking order of deep-subwavelength dielectric layers,since the spin-orbit interaction of light is dependent on slight phase accumulations during the wave propagation.Our results indicate that the photonic spin Hall effect could provide a promising and powerful tool for measuring structural defects for all-dielectric systems even in the extreme nanometer scale.展开更多
Bound states in the continuum(BIC)have been widely researched and applied in optics due to their unique electromagnetic response.However,there are still difficulties in predicting and customizing BIC spectra.To addres...Bound states in the continuum(BIC)have been widely researched and applied in optics due to their unique electromagnetic response.However,there are still difficulties in predicting and customizing BIC spectra.To address this issue,we design an efficient combined neural network for highly accurate prediction of quasi-bound states in the continuum(q-BIC)spectrum,as well as for the inverse design of the polarization independent enhancement of the Goos-H?nchen(GH)shift.Firstly,we propose a C_(4)symmetric metasurface for achieving q-BIC spectrum and providing the condition of enhanced GH shift.By employing a combined neural network,the intensity,position,shape,and phase of q-BIC spectrum with ultra-narrow resonance can be accurately predicted and on-demand customized,even under a small dataset.Besides,we develop a screening algorithm for the q-BIC spectrum to quickly realize the polarization independent enhancement of GH shift.As an application,an ultra-high sensitivity refractive index sensor has been proposed,whose sensitivity can reach 2.31×10~7μm/RIU for TM polarization and 1.03×10~6μm/RIU for TE polarization.Therefore,this work brings new solutions for quick prediction of q-BIC spectrum and the development of flexible polarization photonic devices.展开更多
基金the National Natural Science Foundation of China(62271322)the Guangdong Basic and Applied Basic Research Foundation(2022A1515011003 and 2023A1515030152)the Shenzhen Science and Technology Program(JCYJ20210324095610027 and JCYJ20210324095611030).
文摘Optical orbital angular momentum(OAM)mode multiplexing has emerged as a promising technique for boosting communication capacity.However,most existing studies have concentrated on channel(de)-multiplexing,overlooking the critical aspect of channel routing.This challenge involves the reallocation of multiplexed OAM modes across both spatial and temporal domains—a vital step for developing versatile communication networks.To address this gap,we introduce a novel approach based on the time evolution of OAM modes,utilizing the orthogonal conversion and diffractive modulation capabilities of unitary transformations.This approach facilitates high-dimensional orthogonal transformations of OAM mode vectors,altering both the propagation direction and the spatial location.Using Fresnel diffraction matrices as unitary operators,it manipulates the spatial locations of light beams during transmission,breaking the propagation invariance and enabling temporal evolution.As a demonstration,we have experimentally implemented the deep routing of four OAM modes within two distinct time sequences.Achieving an average diffraction efficiency above 78.31%,we have successfully deep-routed 4.69 Tbit-s^(-1)quadrature phase-shift keying(QPSK)signals carried by four multiplexed OAM channels,with a bit error rate below 10^(-6).These results underscore the efficacy of our routing strategy and its promising prospects for practical applications.
基金supported by the National Natural Science Foundation of China (No. 52378456, No. W2421062, No. 52008235)the Special Foundation of Achievements Transformation Guide of Department of Science and Technology of Shanxi Province (No. 202204021301075, No.201804D131034)+1 种基金the Patent Transformation Project of Shanxi Province(No. 202306009)Shanxi Graduate Education Innovation Plan(2024SJ027)。
文摘Bio-asphalt has a great application prospect in the replacement of petroleum-based asphalt to pave and maintain asphalt pavement. However, the problems of flow-induced crystallization and phase separation caused by flowinduced crystallization had severely restricted its application. This paper describes the progress of research on preparation, property evaluation and phase separation mechanism of bio-asphalt. The advantages and disadvantages of preparation methods of bio-asphalt are states. The fundamental physical and rheological properties of bio-asphalt are investigated, especially for flow-induced crystallization. There exists obvious flow-induced crystallization because bio-asphalt is rich in waxes that crystallize easily. Owing to the existence of excess biochar,bio-asphalt appears phase separation. A brief review of the effect of bio-oil and biochar on asphalt volatile organic compounds(VOCs) is presented. Research find that bio-oil/biochar are not only replenish the light components of asphalt, but also improve the flow-induced crystallization and phase separation of bio-asphalt. There exists synergistic effect of biochar and bio-oil in asphalt modification. Moreover, biochar can improve the durability of bio-oil modified asphalt, but excessive addition of biochar to bio-oil modified asphalt can cause phase separation.Adding an appropriate amount of bio-oil and biochar to asphalt can improve its high-temperature resistance, lowtemperature crack resistance, and system compatibility.
基金supported by the National Natural Science Foundation of China(Nos.12374273,12421005,and 92464205)the Hunan Provincial Major Sci-Tech Program(No.2023ZJ1010)+1 种基金the Key Laboratory Foundation of Complex Environment Optoelectronic Information Perception of Ministry of Education,Fundamental Research Funds for the Central Universities(No.YJSJ25020)the Innovation Fund of Xidian University。
文摘We report tunable in-plane shifts of the photonic spin Hall effect(PSHE)for Laguerre-Gauss mode(LGM)at the glass-air interface coated with a ReS_(2)-graphene heterostructure(HS).It is found that the in-plane shifts of PSHE can be effectively modulated by altering the topological charge of the incident LGM and the rotation angle of the ReS_(2)near the critical angle.Interestingly,we find anomalous enhanced in-plane shifts of PSHE far from the critical angle with specific polarization angles,which rise from the sharp decrease of the reflection coefficient for the circularly polarized components.Our results will provide useful insight for the adjustment of the in-plane shifts of PSHE.
基金supported by the National Natural Science Foundation of China(Nos.12374273,12421005,62271332,and 62275162)the Basic and Applied Basic Research Foundation of Guangdong Province(Nos.2023A1515030152)+1 种基金Hunan Provincial Major Sci-Tech Program(No.2023ZJ1010)the Open Fund Project of State Key Laboratory of Precision Measurement Technology and Instruments(No.2024PMTI04).
文摘The efficiency of the photonic spin Hall effect(PSHE)has attracted increasing attention,as it plays a key role in the development of spin-selective devices.However,highly efficient enhancement of PSHE has always been achieved at a single wavelength.Here,we propose a method to achieve highly efficient enhancement of the photonic spin Hall effect over a broadband operating wavelength by utilizing a magnetic dipole quasibounded state in the continuum(q-MDBIC)with a high refractive index.Under both horizontal and vertical polarization incidence,when the wavelength is 50.9–51.9μm and the incident angle is 0.5°–10°,the transverse shift of PSHE can reach 1.7λ–37λ,with high efficiency of more than 90%.Meanwhile,the quality(Q)factor can also be maintained around 55.Furthermore,different metasurface lattice periods can achieve different broadband PSHE,which provides favorable conditions for the control of broadband PSHE.Our work will have wide applications in devices with efficient spin selection.
基金This research was partially supported by the National Natural Science Foundation of China(Grants No.11274106,No.11474089 and No.11447010)the China Postdoctoral Science Foundation(Grant No.2014M562198)+1 种基金the Scientific Research Fund of Hunan Provincial Education Department of China(Grant No.13B003)the Natural Science Foundation of Hunan Province(Grant No.2015JJ3026).
文摘The photonic spin Hall effect(SHE)in the reflection and refraction at an interface is very weak because of the weak spin-orbit interaction.Here,we report the observation of a giant photonic SHE in a dielectric-based metamaterial.The metamaterial is structured to create a coordinate-dependent,geometric Pancharatnam–Berry phase that results in an SHE with a spin-dependent splitting in momentum space.It is unlike the SHE that occurs in real space in the reflection and refraction at an interface,which results from the momentum-dependent gradient of the geometric Rytov–Vladimirskii–Berry phase.We theorize a unified description of the photonic SHE based on the two types of geometric phase gradient,and we experimentally measure the giant spin-dependent shift of the beam centroid produced by the metamaterial at a visible wavelength.Our results suggest that the structured metamaterial offers a potential method of manipulating spin-polarized photons and the orbital angular momentum of light and thus enables applications in spin-controlled nanophotonics.
基金Program of Fundamental Rescarch of Science and Technology Planning Project of Shenzhen Munipality(JCYJ20180507182035270)Science and Technology Planning Project of Guangdong Province(2016B050501005)+3 种基金Science and Technology Project of Shenzhen(ZDSYS201707271014468)International Collaborative Laboratory of 2D Materials for Opeoelectronics Science and Technology(2DMOST2018003)National Natural Science Foundation of China(61805087,61805149)Natural Science Foundation of Guangdong Province(2016A030310065,2018A030313368,2020A1515011392).
文摘Photonic spin Hall efect(SHE)provides new opportunities for achieving spin-based photonics applications.However,flexibly manipulating the spin-dependent sltting(SDS)of photonic SHE and imposing extra phase modulation on the two spin components are always a challenge.Here,a controllable SHE mechanism based on phase function construction is reported.It is conduded that the phases with specific functional structures performing a coordinate translation are equivalent to integrating a gradient phase to the original phases.Hence,the original phase can be used for independent phase modulation,and the gradient phase originating from the co-ordinate translation is capable of manipulating the SDS.A metasurface with Pancharatnam-Berry phase that can impose conjugate phases to the two spin components of light is fabricated to verify this mechanism.By shifing the light position,the SDS is continuously manipulated in the visible region,which is successfully used for detecting the polarization llipticity.The extra phase modulation is also performed with the original phase and thus enables measuring singular beams.It is anticipated that the controllable SHE manipulation method may open new avenues in the fields of spin photonics,optical sensing,optical communications,etc.
基金the National Natural Science Foundation of China(Grant Nos.62271332,12374273,and 62275162)the Guangdong Basic and Applied Basic Research Foundation(No.2023A1515030152)+1 种基金the Shenzhen Government’s Plan of Science and Technology(Nos.JCYJ20180305124927623 and JCYJ20190808150205481)the Training Program for Excellent Young innovators of Changsha(No.kq2107013).
文摘Vortex beam with fractional orbital angular momentum (FOAM) is the excellent candidate for improving the capacity of free-space optical (FSO) communication system due to its infinite modes. Therefore, the recognition of FOAM modes with higher resolution is always of great concern. In this work, through an improved EfficientNetV2 based convolutional neural network (CNN), we experimentally achieve the implementation of the recognition of FOAM modes with a resolution as high as 0.001. To the best of our knowledge, it is the first time this high resolution has been achieved. Under the strong atmospheric turbulence (AT) (C_(n)^(2)=10^(-15)m^(-2/3)), the recognition accuracy of FOAM modes at 0.1 and 0.01 resolution with our model is up to 99.12% and 92.24% for a long transmission distance of 2000 m. Even for the resolution at 0.001, the recognition accuracy can still remain at 78.77%. This work provides an effective method for the recognition of FOAM modes, which may largely improve the channel capacity of the free-space optical communication.
基金National Natural Science Foundation of China(NSFC)(11274106,11474089)
文摘In this paper,we examine the tiny polarization rotation effect in total internal reflection due to the spin–orbit interaction of light.We find that the tiny polarization rotation rate will induce a geometric phase gradient,which can be regarded as the physical origin of photonic spin Hall effect.We demonstrate that the spin-dependent splitting in position space is related to the polarization rotation in momentum space,while the spin-dependent splitting in momentum space is attributed to the polarization rotation in position space.Furthermore,we introduce a quantum weak measurement to determine the tiny polarization rotation rate.The rotation rate in momentum space is obtained with 118 nm,which manifests itself as a spatial shift,and the rotation rate in position space is achieved with 38 μrad∕λ,which manifests itself as an angular shift.The investigation of the polarization rotation characteristics will provide insights into the photonic spin Hall effect and will enable us to better understand the spin–orbit interaction of light.
基金the support partly from the National Natural Science Fund for Excellent Young Scientists Fund Program(Overseas)of ChinaNational Natural Science Foundation of China(Grant No.62175212)+8 种基金the National Natural Science Foundation of China(Grant Nos.11961141010,and 61975176)supported by the National Natural Science Foundation of China(Grant No.11604095)Zhejiang Provincial Natural Science Fund Key Project(Grant No.Z23F050009)Fundamental Research Funds for the Central Universities(Grant No.2021FZZX001-19)Zhejiang University Global Partnership Fundthe support partly from the Key Research and Development Program of the Ministry of Science and Technology(Grant Nos.2022YFA1404704,2022YFA1404902,and 2022YFA1405200)the support from the Israel Science Foundation(Grant No.3334/19)the Israel Science Foundation(Grant No.830/19)the Training Program for Excellent Young Innovators of Changsha(Grant No.kq2107013)。
文摘Effective-medium theory pertains to the theoretical modelling of homogenization,which aims to replace an inhomogeneous structure of subwavelength-scale constituents with a homogeneous effective medium.The effective-medium theory is fundamental to various realms,including electromagnetics and material science,since it can largely decrease the complexity in the exploration of light-matter interactions by providing simple acceptable approximation.Generally,the effective-medium theory is thought to be applicable to any all-dielectric system with deep-subwavelength constituents,under the condition that the effective medium does not have a critical angle,at which the total internal reflection occurs.Here we reveal a fundamental breakdown of the effective-medium theory that can be applied in very general conditions:showing it for deep-subwavelength all-dielectric multilayers even without a critical angle.Our finding relies on an exotic photonic spin Hall effect,which is shown to be ultrasensitive to the stacking order of deep-subwavelength dielectric layers,since the spin-orbit interaction of light is dependent on slight phase accumulations during the wave propagation.Our results indicate that the photonic spin Hall effect could provide a promising and powerful tool for measuring structural defects for all-dielectric systems even in the extreme nanometer scale.
基金supported by the National Natural Science Foundation of China(Grant Nos.12374273,12421005,62271332,and 62275162)Training Program for Excellent Young Innovators of Changsha(Grant No.kq2107013)+2 种基金Guangdong Basic and Applied Basic Research Foundation(Grant No.2023A1515030152)Shenzhen Government’s Plan of Science and Technology(Grant Nos.JCYJ20180305124927623,and JCYJ20190808150205481)Hunan Provincial Major Sci-Tech Program(Grant No.2023ZJ1010)。
文摘Bound states in the continuum(BIC)have been widely researched and applied in optics due to their unique electromagnetic response.However,there are still difficulties in predicting and customizing BIC spectra.To address this issue,we design an efficient combined neural network for highly accurate prediction of quasi-bound states in the continuum(q-BIC)spectrum,as well as for the inverse design of the polarization independent enhancement of the Goos-H?nchen(GH)shift.Firstly,we propose a C_(4)symmetric metasurface for achieving q-BIC spectrum and providing the condition of enhanced GH shift.By employing a combined neural network,the intensity,position,shape,and phase of q-BIC spectrum with ultra-narrow resonance can be accurately predicted and on-demand customized,even under a small dataset.Besides,we develop a screening algorithm for the q-BIC spectrum to quickly realize the polarization independent enhancement of GH shift.As an application,an ultra-high sensitivity refractive index sensor has been proposed,whose sensitivity can reach 2.31×10~7μm/RIU for TM polarization and 1.03×10~6μm/RIU for TE polarization.Therefore,this work brings new solutions for quick prediction of q-BIC spectrum and the development of flexible polarization photonic devices.
