Optics Communications最新文献

英文中文

Research on resource allocation of hybrid indoor VLC networks

IF 2.2 3区物理与天体物理 Q2 OPTICS

Optics Communications

Pub Date : 2025-01-08 DOI: 10.1016/j.optcom.2025.131503

XiZheng Ke, MengXia Wei, Huanhuan Qin

To address the resource allocation (RA) challenge in heterogeneous visible light communication (VLC) networks, this study develops an indoor VLC hybrid system comprising multiple VLC access points (APs), a single radio frequency (RF) access point, and a single infrared (IR) AP. A joint load balancing and power allocation strategy is proposed for the VLC/RF downlink, accompanied by an iterative algorithm and optimization framework tailored for the power allocation subproblem, which allocates power to each AP to maximize data throughput. The algorithm determines optimal power distribution through alternating solutions of dual variables. Furthermore, the effective capacity of a single user with varying quality of service (QoS) requirements in the IR uplink is examined, employing four distinct power control strategies: equal power allocation and Water-Filling algorithm, sub-channel independent optimization algorithm, and sub-channel joint optimization algorithm within simulations. Results indicate that this approach is agnostic to step size or initial variable values while offering enhanced convergence speed and performance compared to traditional subgradient methods. System capacity and fairness are notably improved alongside rapid convergence rates. Considering performance metrics based on system capacity, the sub-channel joint optimization algorithm is the optimal power control strategy.

{"title":"Research on resource allocation of hybrid indoor VLC networks","authors":"XiZheng Ke, MengXia Wei, Huanhuan Qin","doi":"10.1016/j.optcom.2025.131503","DOIUrl":"10.1016/j.optcom.2025.131503","url":null,"abstract":"<div><div>To address the resource allocation (RA) challenge in heterogeneous visible light communication (VLC) networks, this study develops an indoor VLC hybrid system comprising multiple VLC access points (APs), a single radio frequency (RF) access point, and a single infrared (IR) AP. A joint load balancing and power allocation strategy is proposed for the VLC/RF downlink, accompanied by an iterative algorithm and optimization framework tailored for the power allocation subproblem, which allocates power to each AP to maximize data throughput. The algorithm determines optimal power distribution through alternating solutions of dual variables. Furthermore, the effective capacity of a single user with varying quality of service (QoS) requirements in the IR uplink is examined, employing four distinct power control strategies: equal power allocation and Water-Filling algorithm, sub-channel independent optimization algorithm, and sub-channel joint optimization algorithm within simulations. Results indicate that this approach is agnostic to step size or initial variable values while offering enhanced convergence speed and performance compared to traditional subgradient methods. System capacity and fairness are notably improved alongside rapid convergence rates. Considering performance metrics based on system capacity, the sub-channel joint optimization algorithm is the optimal power control strategy.</div></div>","PeriodicalId":19586,"journal":{"name":"Optics Communications","volume":"578 ","pages":"Article 131503"},"PeriodicalIF":2.2,"publicationDate":"2025-01-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143104104","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}

引用次数: 0

A high-sensitivity curvature mini-two-path MZI fiber sensor based on a four-core fiber

IF 2.2 3区物理与天体物理 Q2 OPTICS

Optics Communications

Pub Date : 2025-01-08 DOI: 10.1016/j.optcom.2024.131457

Xiaojun Zhu , Jiajia Wang , Jiayi Qian , Yan Wang , Hai Liu , Juan Cao , Yuechun Shi , Yongjie Yang , Jicong Zhao , Wuming Wu

We propose and demonstrate a high curvature sensitivity fiber sensor with a mini-two-path Mach-Zehnder interferometer (MTP-MZI) structure based on four-core fiber (FCF). A simple arc discharge technology is used to fabricate the MTP-MZI, where the sensing path is an in-line MZI (IMZI) structure that directly sandwiched the FCF between two sections of coreless fiber (CLF), and the reference path is a single-mode fiber (SMF) only. When the curvature changes from 0 m⁻¹ to 0.101045 m^-1, the IMZI sensor has a maximum curvature sensitivity of 57.29 dB/m⁻¹, while the MTP-MZI sensor has a sensitivity of 108.29 dB/m⁻¹, the curvature sensitivity has been improved by 1.89 times, which is the highest intensity-modulated curvature sensitivity based on multi-core fiber, to the best of our knowledge. The comparable experiment illustrated that the MTP-MZI structure can effectively enhance the sensor's sensitivity and provide an effective method to prepare a good-performance sensor with low-cost, miniaturized, and simple requirement technology.

{"title":"A high-sensitivity curvature mini-two-path MZI fiber sensor based on a four-core fiber","authors":"Xiaojun Zhu , Jiajia Wang , Jiayi Qian , Yan Wang , Hai Liu , Juan Cao , Yuechun Shi , Yongjie Yang , Jicong Zhao , Wuming Wu","doi":"10.1016/j.optcom.2024.131457","DOIUrl":"10.1016/j.optcom.2024.131457","url":null,"abstract":"<div><div>We propose and demonstrate a high curvature sensitivity fiber sensor with a mini-two-path Mach-Zehnder interferometer (MTP-MZI) structure based on four-core fiber (FCF). A simple arc discharge technology is used to fabricate the MTP-MZI, where the sensing path is an in-line MZI (IMZI) structure that directly sandwiched the FCF between two sections of coreless fiber (CLF), and the reference path is a single-mode fiber (SMF) only. When the curvature changes from 0 m<sup>−1</sup> to 0.101045 m<sup>-1</sup>, the IMZI sensor has a maximum curvature sensitivity of 57.29 dB/m<sup>−1</sup>, while the MTP-MZI sensor has a sensitivity of 108.29 dB/m<sup>−1</sup>, the curvature sensitivity has been improved by 1.89 times, which is the highest intensity-modulated curvature sensitivity based on multi-core fiber, to the best of our knowledge. The comparable experiment illustrated that the MTP-MZI structure can effectively enhance the sensor's sensitivity and provide an effective method to prepare a good-performance sensor with low-cost, miniaturized, and simple requirement technology.</div></div>","PeriodicalId":19586,"journal":{"name":"Optics Communications","volume":"578 ","pages":"Article 131457"},"PeriodicalIF":2.2,"publicationDate":"2025-01-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143104127","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}

引用次数: 0

The mechanisms of particulates sprayed by optical components under intense laser irradiation on the damage performance of dielectric films

IF 2.2 3区物理与天体物理 Q2 OPTICS

Optics Communications

Pub Date : 2025-01-08 DOI: 10.1016/j.optcom.2025.131502

Zixuan Chen, Ye Tian, Fang Wang, Laixi Sun, Hongjie Liu, Xuewei Deng, Qiang Yuan, Yuhai Li

In high-power laser facilities, the particulate contaminants originating from damaged optical components play a pivotal role in degrading the laser-induced damage performance of other components. In this study, our attention was centered on high reflectance multilayer HfO₂/SiO₂ dielectric film components. We delved deep into the mechanisms underlying particulate generation and deposition during the damage process and probed into how these particulate contaminants lead to performance degradation of the components. Firstly, we created damage to generate particulates in a sealed environment to investigate the rules of particulates generation and deposition. Then measured the laser induced damage threshold and the morphology of contaminated dielectric film, the laser induced damage threshold decreased by approximately 63.6%–83.5% and the damage morphology varied. We elucidated the modulation mechanisms of particulate contaminants parameters (composition, size, light transmission performance) on the electric field and light intensity by the utilization of multi-physics field simulations, particulate contaminants increased both the peak and range of the electric field/light field around the component during the fundamental frequency laser irradiation. The research results provided a research foundation for inhibiting particulate contaminants generation and removing surface contaminants from optical components in high-power laser facilities.

{"title":"The mechanisms of particulates sprayed by optical components under intense laser irradiation on the damage performance of dielectric films","authors":"Zixuan Chen, Ye Tian, Fang Wang, Laixi Sun, Hongjie Liu, Xuewei Deng, Qiang Yuan, Yuhai Li","doi":"10.1016/j.optcom.2025.131502","DOIUrl":"10.1016/j.optcom.2025.131502","url":null,"abstract":"<div><div>In high-power laser facilities, the particulate contaminants originating from damaged optical components play a pivotal role in degrading the laser-induced damage performance of other components. In this study, our attention was centered on high reflectance multilayer HfO₂/SiO₂ dielectric film components. We delved deep into the mechanisms underlying particulate generation and deposition during the damage process and probed into how these particulate contaminants lead to performance degradation of the components. Firstly, we created damage to generate particulates in a sealed environment to investigate the rules of particulates generation and deposition. Then measured the laser induced damage threshold and the morphology of contaminated dielectric film, the laser induced damage threshold decreased by approximately 63.6%–83.5% and the damage morphology varied. We elucidated the modulation mechanisms of particulate contaminants parameters (composition, size, light transmission performance) on the electric field and light intensity by the utilization of multi-physics field simulations, particulate contaminants increased both the peak and range of the electric field/light field around the component during the fundamental frequency laser irradiation. The research results provided a research foundation for inhibiting particulate contaminants generation and removing surface contaminants from optical components in high-power laser facilities.</div></div>","PeriodicalId":19586,"journal":{"name":"Optics Communications","volume":"579 ","pages":"Article 131502"},"PeriodicalIF":2.2,"publicationDate":"2025-01-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143159941","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}

引用次数: 0

Ultra-highly sensitive Fano resonator with dynamic tunability based on plasmonics

IF 2.2 3区物理与天体物理 Q2 OPTICS

Optics Communications

Pub Date : 2025-01-08 DOI: 10.1016/j.optcom.2025.131477

Wen Zhang , Qijia Weng , Yuanmei Xu , Hui Liu , Xue-Shi Li

A novel Fano resonator can be dynamically tuned as well as keep pretty high sensitivity at the same time. The Fano resonator is designed by a triangular ring-like cavity coupled with a metal–insulator–metal (MIM) waveguide, enabling it to resonant in the terahertz band. The device’s performance is analyzed using the finite element method (FEM), and its resonances are validated with multimode interference coupled-mode theory (MICMT). The simulation results show that triangular ring-like cavity structure coupled with the rectangular structure will excite two asymmetric Fano resonances. According to the Fabry–Pérot (FP) resonant theory, the Fano resonant frequency can be easily manipulated by changing the cavity structure parameters. In addition, by integrating graphene into the resonator, it is possible to significantly shift the Fano resonance peak by altering the Fermi energy level, reaching up to 229 GHz. The Fano resonators are also very sensitive to the medium they interact with, achieving a maximum figure of merit (FOM) of 25,853. Finally, the Fano resonator is applied in cancer cell detection to expand the detection band while maintaining accurate detection. The proposed resonator’s superior performance offers potential in medium detection, narrowband filtering, and frequency selection, etc.

{"title":"Ultra-highly sensitive Fano resonator with dynamic tunability based on plasmonics","authors":"Wen Zhang , Qijia Weng , Yuanmei Xu , Hui Liu , Xue-Shi Li","doi":"10.1016/j.optcom.2025.131477","DOIUrl":"10.1016/j.optcom.2025.131477","url":null,"abstract":"<div><div>A novel Fano resonator can be dynamically tuned as well as keep pretty high sensitivity at the same time. The Fano resonator is designed by a triangular ring-like cavity coupled with a metal–insulator–metal (MIM) waveguide, enabling it to resonant in the terahertz band. The device’s performance is analyzed using the finite element method (FEM), and its resonances are validated with multimode interference coupled-mode theory (MICMT). The simulation results show that triangular ring-like cavity structure coupled with the rectangular structure will excite two asymmetric Fano resonances. According to the Fabry–Pérot (FP) resonant theory, the Fano resonant frequency can be easily manipulated by changing the cavity structure parameters. In addition, by integrating graphene into the resonator, it is possible to significantly shift the Fano resonance peak by altering the Fermi energy level, reaching up to 229 GHz. The Fano resonators are also very sensitive to the medium they interact with, achieving a maximum figure of merit (FOM) of 25,853. Finally, the Fano resonator is applied in cancer cell detection to expand the detection band while maintaining accurate detection. The proposed resonator’s superior performance offers potential in medium detection, narrowband filtering, and frequency selection, etc.</div></div>","PeriodicalId":19586,"journal":{"name":"Optics Communications","volume":"578 ","pages":"Article 131477"},"PeriodicalIF":2.2,"publicationDate":"2025-01-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143172091","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}

引用次数: 0

Enhancement in power stratification efficiency of NOMA-MIMO-aided downlink indoor visible light communication networks

IF 2.2 3区物理与天体物理 Q2 OPTICS

Optics Communications

Pub Date : 2025-01-08 DOI: 10.1016/j.optcom.2025.131499

Haylemaryam Gashaw Geto, Gemechu Tesfaye Tola

Non-orthogonal multiple access (NOMA)-aided visible light communication (VLC) network is deemed a potential alternative for data access and offers superior spectral efficiency, primarily for indoor communication systems. Despite its apparent advantages, the NOMA technique suffers from residual interference in multi-user multiple-input multiple-output (MIMO)-based VLC networks when users attempt to reconstruct their signals from the superimposed received signal. To combat such difficulties, developing an optimal and adaptive power splitting algorithm is crucial. In this paper, a novel power stratification strategy termed as sigmoid gain ratio power allocation (SGRPA) is proposed to alleviate the power allocation constraints of MIMO-NOMA-based downlink VLC networks through sigmoid function transformation. A comparative study between conventional power allocation approaches for a

2 \times 2

MIMO-based VLC network is conducted in multi-user indoor environment. We also illustrate the impact of tuning the field of views (FoVs) of receivers and the transmission angles of light-emitting diodes (LEDs) to find the optimal position of the VLC access point (AP) and the user FoV. The proposed SGRPA scheme exhibits a significant data rate enhancement when compared to gain ratio power allocation (GRPA), normalized gain difference power allocation (NGDPA), and normalized logarithmic gain ratio power allocation (NLGRPA) methods with a multi-user scenario.

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引用次数: 0

Quad-functional narrowband-broadband electrical/thermal dual-controlled adjustable metasurface absorber

IF 2.2 3区物理与天体物理 Q2 OPTICS

Optics Communications

Pub Date : 2025-01-07 DOI: 10.1016/j.optcom.2025.131494

Muhammad Ali , Yunpeng Yao , Riaz Ali , Laleen Ali , Zaib Ullah Khan , Sajjad Ali , Jawad Ali , Zainab Saif , Wei Su

This study presents a novel terahertz metamaterial absorber that utilizes the adjustable properties of vanadium dioxide and graphene to dynamically alter its functions and absorption bands. The finite-difference time-domain (FDTD) modelling results show that the suggested design can effectively absorb a wide range of frequencies and two narrow bands at the same time. The absorption frequency of the QMA can be change by controlling the chemical potential of graphene and the temperature of VO₂. The QMA show switchable character between narrowband absorption mode “NAM” and broadband absorption mode “BAM” by electronically varying the chemical potential of graphene, it can be seen in P₁ and P₂ at frequency 2.79 and 3.33 THz respectively. Thermal modification of VO₂ phase shift allows the low-frequency absorption mode (“LAM”) and the high-frequency absorption mode (“HAM”) to transition between P₃ and P₄, which correspond to frequencies of 3.53 and 4.43 THz, respectively. The mechanism of “NAM” and “BAM” is found to be the transition between the fundamental and second order graphene surface resonances, whereas the phase change in VO₂ is responsible for the transition between “LAM” and “HAM”. Furthermore, the QMA is polarization independent in all absorption modes. These results imply that the suggested QMA has a great deal of promise for use in sensing, filtering, switching and stealth applications.

{"title":"Quad-functional narrowband-broadband electrical/thermal dual-controlled adjustable metasurface absorber","authors":"Muhammad Ali , Yunpeng Yao , Riaz Ali , Laleen Ali , Zaib Ullah Khan , Sajjad Ali , Jawad Ali , Zainab Saif , Wei Su","doi":"10.1016/j.optcom.2025.131494","DOIUrl":"10.1016/j.optcom.2025.131494","url":null,"abstract":"<div><div>This study presents a novel terahertz metamaterial absorber that utilizes the adjustable properties of vanadium dioxide and graphene to dynamically alter its functions and absorption bands. The finite-difference time-domain (FDTD) modelling results show that the suggested design can effectively absorb a wide range of frequencies and two narrow bands at the same time. The absorption frequency of the QMA can be change by controlling the chemical potential of graphene and the temperature of VO<sub>2</sub>. The QMA show switchable character between narrowband absorption mode “NAM” and broadband absorption mode “BAM” by electronically varying the chemical potential of graphene, it can be seen in P<sub>1</sub> and P<sub>2</sub> at frequency 2.79 and 3.33 THz respectively. Thermal modification of VO<sub>2</sub> phase shift allows the low-frequency absorption mode (“LAM”) and the high-frequency absorption mode (“HAM”) to transition between P<sub>3</sub> and P<sub>4</sub>, which correspond to frequencies of 3.53 and 4.43 THz, respectively. The mechanism of “NAM” and “BAM” is found to be the transition between the fundamental and second order graphene surface resonances, whereas the phase change in VO<sub>2</sub> is responsible for the transition between “LAM” and “HAM”. Furthermore, the QMA is polarization independent in all absorption modes. These results imply that the suggested QMA has a great deal of promise for use in sensing, filtering, switching and stealth applications.</div></div>","PeriodicalId":19586,"journal":{"name":"Optics Communications","volume":"578 ","pages":"Article 131494"},"PeriodicalIF":2.2,"publicationDate":"2025-01-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143104130","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}

引用次数: 0

External modulation of a CW fiber laser via thermocavitation microbubbles: A novel approach for short pulse generation

IF 2.2 3区物理与天体物理 Q2 OPTICS

Optics Communications

Pub Date : 2025-01-07 DOI: 10.1016/j.optcom.2025.131501

R. Zaca-Morán , A. Guzmán-Barraza , Noel-Ivan Toto-Arellano , P. Zaca-Morán , J.G. Ortega-Mendoza

This research introduces a novel method for generating short pulses using microbubbles produced by thermocavitation, a process initiated in both absorbent and non-absorbent solutions. The innovation uses a multimode optical fiber, onto which silver and copper nanoparticles are photodeposited, enabling precise control over the pulse generation process. By immersing the fiber tip in ethanol or a Hibiscus flower extract in ethanol, tunable pulses are generated with frequencies ranging from 0.4 to 3.3 kHz in ethanol and 0.64–2.8 kHz in the Hibiscus solution, with pulse durations of 15–81 μs and 22–41 μs, respectively. The emitted pulse wavelength remains consistently at 443 nm, demonstrating the system's ability to produce short, precise pulses across different media. Additional experiments were carried out using methylene blue as the working solution. A maximum frequency of 1.51 kHz was achieved through interaction with a continuous-wave laser at a wavelength of 658 nm. Subsequently, ethanol was used as the medium, achieving a maximum frequency of 1.43 kHz with a laser operating at a wavelength of 976 nm. The innovation of this device is attributed to its tunability and versatility in using various media to control pulse characteristics. This flexibility, combined with a relatively simple and cost-effective fabrication process, positions the system as a promising solution for applications in quantum telecommunications, ophthalmic surgery, ultrasound imaging, metrology, and sensor technology. Its ability to generate controlled, high-frequency pulses from thermocavitation microbubbles marks a significant advancement in pulse generation technology.

{"title":"External modulation of a CW fiber laser via thermocavitation microbubbles: A novel approach for short pulse generation","authors":"R. Zaca-Morán , A. Guzmán-Barraza , Noel-Ivan Toto-Arellano , P. Zaca-Morán , J.G. Ortega-Mendoza","doi":"10.1016/j.optcom.2025.131501","DOIUrl":"10.1016/j.optcom.2025.131501","url":null,"abstract":"<div><div>This research introduces a novel method for generating short pulses using microbubbles produced by thermocavitation, a process initiated in both absorbent and non-absorbent solutions. The innovation uses a multimode optical fiber, onto which silver and copper nanoparticles are photodeposited, enabling precise control over the pulse generation process. By immersing the fiber tip in ethanol or a <em>Hibiscus flower</em> extract in ethanol, tunable pulses are generated with frequencies ranging from 0.4 to 3.3 kHz in ethanol and 0.64–2.8 kHz in the <em>Hibiscus</em> solution, with pulse durations of 15–81 μs and 22–41 μs, respectively. The emitted pulse wavelength remains consistently at 443 nm, demonstrating the system's ability to produce short, precise pulses across different media. Additional experiments were carried out using methylene blue as the working solution. A maximum frequency of 1.51 kHz was achieved through interaction with a continuous-wave laser at a wavelength of 658 nm. Subsequently, ethanol was used as the medium, achieving a maximum frequency of 1.43 kHz with a laser operating at a wavelength of 976 nm. The innovation of this device is attributed to its tunability and versatility in using various media to control pulse characteristics. This flexibility, combined with a relatively simple and cost-effective fabrication process, positions the system as a promising solution for applications in quantum telecommunications, ophthalmic surgery, ultrasound imaging, metrology, and sensor technology. Its ability to generate controlled, high-frequency pulses from thermocavitation microbubbles marks a significant advancement in pulse generation technology.</div></div>","PeriodicalId":19586,"journal":{"name":"Optics Communications","volume":"579 ","pages":"Article 131501"},"PeriodicalIF":2.2,"publicationDate":"2025-01-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143159945","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}

引用次数: 0

Comprehensive and analytical investigation of topological interface states in one-dimensional photonic systems

IF 2.2 3区物理与天体物理 Q2 OPTICS

Optics Communications

Pub Date : 2025-01-07 DOI: 10.1016/j.optcom.2025.131500

Jamal Barvestani

Topological interface states (TISs) have attracted considerable interest due to their exceptional impact on enhancing light-matter interactions in photonic systems. We investigate the TISs in a one-dimensional photonic heterostructure incorporating a cap layer. The behavior of TISs is examined using the transfer matrix method, varying the physical parameters of the cap layer. An analytical expression for TISs is derived using a direct matching approach based on the Kronig-Penney model. The analytical results acquired for TIS have been simulated across several configurations, and the outcomes indicate full consistency. Our findings indicate that TISs are highly sensitive to the thickness of the cap layer, exhibiting a periodic dependency on its variation. While the cap layer’s permittivity affects the position of TISs, its influence is weaker compared to that of the thickness. Additionally, we analyzed the impact of nonlinearity by adding a thin nonlinear layer at the interface and found that TISs are extremely responsive to the cap layer’s nonlinearity. These results could support the integration of TISs into future topological cavity and laser applications.

{"title":"Comprehensive and analytical investigation of topological interface states in one-dimensional photonic systems","authors":"Jamal Barvestani","doi":"10.1016/j.optcom.2025.131500","DOIUrl":"10.1016/j.optcom.2025.131500","url":null,"abstract":"<div><div>Topological interface states (TISs) have attracted considerable interest due to their exceptional impact on enhancing light-matter interactions in photonic systems. We investigate the TISs in a one-dimensional photonic heterostructure incorporating a cap layer. The behavior of TISs is examined using the transfer matrix method, varying the physical parameters of the cap layer. An analytical expression for TISs is derived using a direct matching approach based on the Kronig-Penney model. The analytical results acquired for TIS have been simulated across several configurations, and the outcomes indicate full consistency. Our findings indicate that TISs are highly sensitive to the thickness of the cap layer, exhibiting a periodic dependency on its variation. While the cap layer’s permittivity affects the position of TISs, its influence is weaker compared to that of the thickness. Additionally, we analyzed the impact of nonlinearity by adding a thin nonlinear layer at the interface and found that TISs are extremely responsive to the cap layer’s nonlinearity. These results could support the integration of TISs into future topological cavity and laser applications.</div></div>","PeriodicalId":19586,"journal":{"name":"Optics Communications","volume":"578 ","pages":"Article 131500"},"PeriodicalIF":2.2,"publicationDate":"2025-01-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143103667","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}

引用次数: 0

Optimization of surface morphology and mechanism of liquid-assisted combined laser removal of surface rust on Q235 steel

IF 2.2 3区物理与天体物理 Q2 OPTICS

Optics Communications

Pub Date : 2025-01-07 DOI: 10.1016/j.optcom.2025.131496

Le Jin, Jixing Cai, BaiJie Zhang, Yubo Liu, Yue Zhou, Jingxuan Qiu

This study aimed to investigate the effect of liquid-assisted laser cleaning on the optimisation of surface morphology and the mechanism of combined laser removal of surface rust on a Q235 steel. A simulation model for liquid-assisted continuous nanosecond combined laser removal of surface rust on a Q235 steel has been developed to examine the effects of varying liquid thicknesses and energy densities on the temperature, removal morphology and stress of the rust layer. The results indicated that the cooling and protective effects of the liquid, along with the impact force generated by its evaporation, reduce the oxide content of the substrate surface and alleviate the formation of re-melted layers, resulting in a flat and smooth substrate. This study provides a theoretical and experimental basis for the application of liquid-assisted laser cleaning technology.

引用次数: 0

Unlocking the potential of air-core fibers for orbital angular momentum applications

IF 2.2 3区物理与天体物理 Q2 OPTICS

Optics Communications

Pub Date : 2025-01-07 DOI: 10.1016/j.optcom.2025.131487

Wenqian Zhao , Yingning Wang , Yiwen Zhang , Xiaoke Wu , Wenpu Geng , Yuanpeng Liu , Yuxi Fang , Changjing Bao , Zhongqi Pan , Yang Yue

Orbital angular momentum (OAM) modes, an orthogonal complete basis for electromagnetic field distribution in optical fibers, offer a promising technology for independent spatial-domain transmission. Various ring fibers have emerged as leading candidates for supporting and manipulating OAM modes. Among these designs, benefitting from the high index contrast, the air-core ring fiber enables a larger number of supported OAM modes and wider effective refraction index separations between OAM modes. In addition, the air-core structure also provides flexibility for dispersion engineering. This paper presents an overview of air-core ring fibers, highlighting their diverse capabilities and potential applications in OAM-based optical communication systems and beyond.

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全部化学•材料生命科学医学物理工程技术环境•农林材料科学地球科学法学管理学化学环境科学与生态学计算机科学教育学经济学农林科学人文科学生物学数学物理与天体物理心理学综合性期刊其他工业工程理学历史学农学文学信息工程

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Optics Communications

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