Pub Date : 2025-02-01DOI: 10.1016/j.photonics.2025.101351
H. Ahmad , M.A.M. Lutfi , M.Z. Samion , M.K.A. Zaini
The generation of mode-locked pulses in the femtosecond region with high output power has shown its demand in various applications, such as laser cutting. Traditional active mode-locking approaches, such as acousto-optic modulators, can be challenging, particularly in timing setups. Alternatively, a semiconductor saturable absorber mirror (SESAM) was used in the passive approach. Yet, its cost and sensitivity to high-humidity environments led to the adoption 2D nanomaterials, which offer robust systems with notable modulation depths. Despite these advancements, most mode-locked lasers using 2D nanomaterials produced pulses in the picosecond region with average output power in the milliwatts (mW) range, limiting their applications. This work addresses the need for higher output power, which presents a detailed methodology for generating stable mode-locked pulses at 1 µm, achieving an average output power > 690 mW, a signal-to-noise ratio (SNR) of 52 dB, and a pulse width of 115 fs. Utilizing Bi2Te3 as a 2D nanomaterial saturable absorber, this work demonstrates a significant improvement in pulse stability and SNR, highlighting the potential for advanced applications.
{"title":"Ultrafast pulse generation at 115 fs with a high peak power of 0.24 MW aided with Bi2Te3 2D nanomaterials","authors":"H. Ahmad , M.A.M. Lutfi , M.Z. Samion , M.K.A. Zaini","doi":"10.1016/j.photonics.2025.101351","DOIUrl":"10.1016/j.photonics.2025.101351","url":null,"abstract":"<div><div>The generation of mode-locked pulses in the femtosecond region with high output power has shown its demand in various applications, such as laser cutting. Traditional active mode-locking approaches, such as acousto-optic modulators, can be challenging, particularly in timing setups. Alternatively, a semiconductor saturable absorber mirror (SESAM) was used in the passive approach. Yet, its cost and sensitivity to high-humidity environments led to the adoption 2D nanomaterials, which offer robust systems with notable modulation depths. Despite these advancements, most mode-locked lasers using 2D nanomaterials produced pulses in the picosecond region with average output power in the milliwatts (mW) range, limiting their applications. This work addresses the need for higher output power, which presents a detailed methodology for generating stable mode-locked pulses at 1 µm, achieving an average output power > 690 mW, a signal-to-noise ratio (SNR) of 52 dB, and a pulse width of 115 fs. Utilizing Bi<sub>2</sub>Te<sub>3</sub> as a 2D nanomaterial saturable absorber, this work demonstrates a significant improvement in pulse stability and SNR, highlighting the potential for advanced applications.</div></div>","PeriodicalId":49699,"journal":{"name":"Photonics and Nanostructures-Fundamentals and Applications","volume":"63 ","pages":"Article 101351"},"PeriodicalIF":2.5,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143167034","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 : 2025-02-01DOI: 10.1016/j.photonics.2025.101359
Nima Ahmadi, Forouhar Farzaneh
Intelligent reflective surfaces using single-bit PIN diodes are studied. The problem of the generation of the grating lobe upon normal incidence is introduced. Two conformal smart surfaces are proposed as possible solutions for mitigation of the grating lobe. Case studies are presented and evaluated for the verification of the proposed approach. Full-wave numerical simulations are performed to show the efficiency of the proposed conformal surface solution.
{"title":"A proposed single-bit planar conformal intelligent reflective surface intended for wireless mm-wave applications","authors":"Nima Ahmadi, Forouhar Farzaneh","doi":"10.1016/j.photonics.2025.101359","DOIUrl":"10.1016/j.photonics.2025.101359","url":null,"abstract":"<div><div>Intelligent reflective surfaces using single-bit PIN diodes are studied. The problem of the generation of the grating lobe upon normal incidence is introduced. Two conformal smart surfaces are proposed as possible solutions for mitigation of the grating lobe. Case studies are presented and evaluated for the verification of the proposed approach. Full-wave numerical simulations are performed to show the efficiency of the proposed conformal surface solution.</div></div>","PeriodicalId":49699,"journal":{"name":"Photonics and Nanostructures-Fundamentals and Applications","volume":"63 ","pages":"Article 101359"},"PeriodicalIF":2.5,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143168027","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}
Due to limitations in computational resources, researchers often bypass the validation of simulation results when investigating large metalenses, especially those significantly larger than the operational wavelength. Typically, they might directly employ simulate-derived units or perform preliminary validation using smaller-scale metalenses before advancing to full-scale experiments. To address this challenge, we propose a method to accelerate the near-field data acquisition phase, which is often the most time-consuming. This involves constructing two-dimensional near-field data by symmetrically expanding a one-dimensional metalens in a circular pattern. Our findings show that this approach can achieve a speedup of over 100 times, with potential for even greater efficiency as metalens size increases. Additionally, this technique is applicable to the computation of multi-level diffraction lenses. In the future, our method is expected to provide researchers with more accurate data for guiding experimental designs, thereby increasing the likelihood of success.
{"title":"Accelerated near-field data acquisition for designing large metalenses using circular symmetry","authors":"Yanfeng Jiang , Hsin-Han Peng , Kaizhu Liu , Hsiang-Chen Chui","doi":"10.1016/j.photonics.2025.101364","DOIUrl":"10.1016/j.photonics.2025.101364","url":null,"abstract":"<div><div>Due to limitations in computational resources, researchers often bypass the validation of simulation results when investigating large metalenses, especially those significantly larger than the operational wavelength. Typically, they might directly employ simulate-derived units or perform preliminary validation using smaller-scale metalenses before advancing to full-scale experiments. To address this challenge, we propose a method to accelerate the near-field data acquisition phase, which is often the most time-consuming. This involves constructing two-dimensional near-field data by symmetrically expanding a one-dimensional metalens in a circular pattern. Our findings show that this approach can achieve a speedup of over 100 times, with potential for even greater efficiency as metalens size increases. Additionally, this technique is applicable to the computation of multi-level diffraction lenses. In the future, our method is expected to provide researchers with more accurate data for guiding experimental designs, thereby increasing the likelihood of success.</div></div>","PeriodicalId":49699,"journal":{"name":"Photonics and Nanostructures-Fundamentals and Applications","volume":"63 ","pages":"Article 101364"},"PeriodicalIF":2.5,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143377259","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 : 2025-02-01DOI: 10.1016/j.photonics.2025.101362
Huazhong Zhang, Juhang Yin
Solar energy is widely applied in fields such as photovoltaic technology, seawater desalination, and photodetection, where efficient utilization of solar energy has been a long-standing pursuit. In this study, we employed a multi-objective Particle Swarm Optimization algorithm to inversely design a grating-structured metamaterial absorber based on MXene and investigated its optical properties using the Finite-Difference Time-Domain method. Our results demonstrate that the designed metamaterial absorber achieves exceptional absorption (97.2 %) across the entire solar radiation spectrum, and low average emissivity (4.9 %) in the infrared region. Theoretical analysis reveals that the broadband absorption arises from the synergistic effect of multiple resonant modes. Furthermore, the MXene-based metamaterial absorber exhibits wide-angle absorption at an incident angle of 60° with minimal polarization dependence. In regions rich in solar radiation, this absorber has the potential to save approximately 1924.7 kWh/m² of energy annually. These findings hold significant implications for applications in solar photovoltaics and optoelectronic conversion.
{"title":"Inverse-designed MXene metamaterial absorber for broadband solar energy harvesting","authors":"Huazhong Zhang, Juhang Yin","doi":"10.1016/j.photonics.2025.101362","DOIUrl":"10.1016/j.photonics.2025.101362","url":null,"abstract":"<div><div>Solar energy is widely applied in fields such as photovoltaic technology, seawater desalination, and photodetection, where efficient utilization of solar energy has been a long-standing pursuit. In this study, we employed a multi-objective Particle Swarm Optimization algorithm to inversely design a grating-structured metamaterial absorber based on MXene and investigated its optical properties using the Finite-Difference Time-Domain method. Our results demonstrate that the designed metamaterial absorber achieves exceptional absorption (97.2 %) across the entire solar radiation spectrum, and low average emissivity (4.9 %) in the infrared region. Theoretical analysis reveals that the broadband absorption arises from the synergistic effect of multiple resonant modes. Furthermore, the MXene-based metamaterial absorber exhibits wide-angle absorption at an incident angle of 60° with minimal polarization dependence. In regions rich in solar radiation, this absorber has the potential to save approximately 1924.7 kWh/m² of energy annually. These findings hold significant implications for applications in solar photovoltaics and optoelectronic conversion.</div></div>","PeriodicalId":49699,"journal":{"name":"Photonics and Nanostructures-Fundamentals and Applications","volume":"63 ","pages":"Article 101362"},"PeriodicalIF":2.5,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143168038","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 : 2025-02-01DOI: 10.1016/j.photonics.2024.101341
Pavel Alekseevskiy , Roman Pototskiy , Anastasia Efimova , Alena Kulakova , Valentin A. Milichko
We report on the photoluminescent (Pl) thermometer based on a rhodium cationic complex (Rh-CC). We discovered that optical pumps by 350 nm and 523 nm cause the Pl centered at 720–735 nm. Cooling of the Rh-CC up to 243 K resulted in conventional linear growth of Pl intensity, providing 4.5 % K−1 relative thermal sensitivity (Sr). Herein, heating of the Rh-CC by laser light leads to unconventional non-linear evolution of the Pl spectrum, attributing to the amorphous state and carbon Pl with 0.5 % K−1 relative thermal sensitivity up to 484 K. The results, thereby, demonstrate an ambivalent behavior of new Pl thermometer operating at 240–500 K temperature range with comparable sensitivity.
{"title":"Ambivalent photoluminescence thermometer based on rhodium cationic complex","authors":"Pavel Alekseevskiy , Roman Pototskiy , Anastasia Efimova , Alena Kulakova , Valentin A. Milichko","doi":"10.1016/j.photonics.2024.101341","DOIUrl":"10.1016/j.photonics.2024.101341","url":null,"abstract":"<div><div>We report on the photoluminescent (Pl) thermometer based on a rhodium cationic complex (Rh-CC). We discovered that optical pumps by 350 nm and 523 nm cause the Pl centered at 720–735 nm. Cooling of the Rh-CC up to 243 K resulted in conventional linear growth of Pl intensity, providing 4.5 % K<sup>−1</sup> relative thermal sensitivity (<em>S</em><sub><em>r</em></sub>). Herein, heating of the Rh-CC by laser light leads to unconventional non-linear evolution of the Pl spectrum, attributing to the amorphous state and carbon Pl with 0.5 % K<sup>−1</sup> relative thermal sensitivity up to 484 K. The results, thereby, demonstrate an ambivalent behavior of new Pl thermometer operating at 240–500 K temperature range with comparable sensitivity.</div></div>","PeriodicalId":49699,"journal":{"name":"Photonics and Nanostructures-Fundamentals and Applications","volume":"63 ","pages":"Article 101341"},"PeriodicalIF":2.5,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143167892","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 : 2025-02-01DOI: 10.1016/j.photonics.2025.101357
Yanli Qu , Yan Chen , Shanjun Chen , Jie Hou , Zao Yi , Liping Fu , Huafeng Zhang
Among the electromagnetic bands, the infrared band occupies a crucial place due to its wide range. Absorption in the long-wave infrared band is an important focus of infrared research and has attracted a great deal of attention from researchers. In this work, a long-wave infrared ultra-wideband absorber based on a four-layer metal–dielectric–metal–dielectric structure is proposed. In the ultra-long operating band of 8–36 μm, the average absorption rate is as high as 95.79 %, brought about by the resonance excitation of various modes, including local surface plasmon resonance, guided mode resonance, cavity resonance, magnetic resonance, and diffraction. At a large incidence angle of 60°, the absorption of the absorber can reach 91.17 % in TE mode, demonstrating insensitivity to large-angle incidence. At 1800 K, the absorber shows an emission efficiency as high as 97.01 % in the long-wave infrared range. It is worth mentioning that our absorber exhibits an extremely large manufacturing tolerance of ± 0.4 μm, making it highly suitable for practical production and application. Therefore, the proposed absorber shows promising potential in applications such as infrared imaging, infrared detection, hot electron collection, radiative cooling, and other related fields. In addition, the absorber can be used in remote sensing applications, as its operating band effectively covers the common remote sensing band from 8 to 30 μm.
{"title":"Study on a simple long-wave infrared ultra-wideband metamaterial absorber with a high tolerance of manufacturing errors","authors":"Yanli Qu , Yan Chen , Shanjun Chen , Jie Hou , Zao Yi , Liping Fu , Huafeng Zhang","doi":"10.1016/j.photonics.2025.101357","DOIUrl":"10.1016/j.photonics.2025.101357","url":null,"abstract":"<div><div>Among the electromagnetic bands, the infrared band occupies a crucial place due to its wide range. Absorption in the long-wave infrared band is an important focus of infrared research and has attracted a great deal of attention from researchers. In this work, a long-wave infrared ultra-wideband absorber based on a four-layer metal–dielectric–metal–dielectric structure is proposed. In the ultra-long operating band of 8–36 μm, the average absorption rate is as high as 95.79 %, brought about by the resonance excitation of various modes, including local surface plasmon resonance, guided mode resonance, cavity resonance, magnetic resonance, and diffraction. At a large incidence angle of 60°, the absorption of the absorber can reach 91.17 % in TE mode, demonstrating insensitivity to large-angle incidence. At 1800 K, the absorber shows an emission efficiency as high as 97.01 % in the long-wave infrared range. It is worth mentioning that our absorber exhibits an extremely large manufacturing tolerance of ± 0.4 μm, making it highly suitable for practical production and application. Therefore, the proposed absorber shows promising potential in applications such as infrared imaging, infrared detection, hot electron collection, radiative cooling, and other related fields. In addition, the absorber can be used in remote sensing applications, as its operating band effectively covers the common remote sensing band from 8 to 30 μm.</div></div>","PeriodicalId":49699,"journal":{"name":"Photonics and Nanostructures-Fundamentals and Applications","volume":"63 ","pages":"Article 101357"},"PeriodicalIF":2.5,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143168032","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 : 2025-02-01DOI: 10.1016/j.photonics.2025.101365
Xin Li , Yangyang Guo , Huibing Mao , Ye Chen , Jiqing Wang , Weifeng Fang
The TiO2:Eu3+ inverse opals have the anatase structure and can be analyzed approximately by the two-dimensional photonic crystal. The emission spectra of the Eu3+ ions in the TiO2:Eu3+ inverse opal demonstrate that the inverse opal has significant manipulation effect on the emission of the Eu3+ ions. With the polystyrene (PS) microsphere size of 300 nm, the emission intensity ratio of the magnetic dipole transition 5D0→7F1 to the electric dipole transition 5D0→7F2 increases by about 4.9 times in the TiO2:Eu3+ inverse opal in comparison with the reference TiO2:Eu3+ nanomaterials sample, meanwhile the electric dipole emission 5D0→7F4 at 695 nm also increases significantly. With the deviation of the PS microsphere size, the above manipulation effect also decreases. The theoretical analysis implies that the above manipulation is mainly due to the forbidden photonic band of the TE mode in the TiO2:Eu3+ inverse opal, which results in the decrease of the electric local density of state in the forbidden photonic band and the decrease of the emission 5D0→7F2, on the contrary, the corresponding emissions 5D0→7F1 and 5D0→7F4 will increase.
{"title":"Manipulation of the magnetic dipole and electric dipole emissions by the TiO2:Eu3+ inverse opal photonic crystals","authors":"Xin Li , Yangyang Guo , Huibing Mao , Ye Chen , Jiqing Wang , Weifeng Fang","doi":"10.1016/j.photonics.2025.101365","DOIUrl":"10.1016/j.photonics.2025.101365","url":null,"abstract":"<div><div>The TiO<sub>2</sub>:Eu<sup>3+</sup> inverse opals have the anatase structure and can be analyzed approximately by the two-dimensional photonic crystal. The emission spectra of the Eu<sup>3+</sup> ions in the TiO<sub>2</sub>:Eu<sup>3+</sup> inverse opal demonstrate that the inverse opal has significant manipulation effect on the emission of the Eu<sup>3+</sup> ions. With the polystyrene (PS) microsphere size of 300 nm, the emission intensity ratio of the magnetic dipole transition <sup>5</sup>D<sub>0</sub>→<sup>7</sup>F<sub>1</sub> to the electric dipole transition <sup>5</sup>D<sub>0</sub>→<sup>7</sup>F<sub>2</sub> increases by about 4.9 times in the TiO<sub>2</sub>:Eu<sup>3+</sup> inverse opal in comparison with the reference TiO<sub>2</sub>:Eu<sup>3+</sup> nanomaterials sample, meanwhile the electric dipole emission <sup>5</sup>D<sub>0</sub>→<sup>7</sup>F<sub>4</sub> at 695 nm also increases significantly. With the deviation of the PS microsphere size, the above manipulation effect also decreases. The theoretical analysis implies that the above manipulation is mainly due to the forbidden photonic band of the TE mode in the TiO<sub>2</sub>:Eu<sup>3+</sup> inverse opal, which results in the decrease of the electric local density of state in the forbidden photonic band and the decrease of the emission <sup>5</sup>D<sub>0</sub>→<sup>7</sup>F<sub>2</sub>, on the contrary, the corresponding emissions <sup>5</sup>D<sub>0</sub>→<sup>7</sup>F<sub>1</sub> and <sup>5</sup>D<sub>0</sub>→<sup>7</sup>F<sub>4</sub> will increase.</div></div>","PeriodicalId":49699,"journal":{"name":"Photonics and Nanostructures-Fundamentals and Applications","volume":"63 ","pages":"Article 101365"},"PeriodicalIF":2.5,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143455053","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 : 2025-02-01DOI: 10.1016/j.photonics.2024.101347
Zilong Zeng , Hongfu Liu , Huafeng Zhang , Shubo Cheng , Yougen Yi , Zao Yi , Junqiao Wang , Jianguo Zhang
This article presents a classic three-layer structure terahertz four-band absorber that is composed of Dirac semimetals (BDS) and silica. By regulating the Fermi energy of the Dirac semimetals, it becomes possible to adjust the frequency of the absorption peaks of the absorber. Specifically, when a Fermi energy of 50 meV was chosen for the Dirac semimetal, four absorption peaks were generated within the 4–8 THz range, and all of these peaks boasted absorption rates exceeding 95 %. Firstly, the structural characteristics of the absorber were introduced, and its feasibility was demonstrated by relying on the impedance matching theory. Subsequently, the variations in the electric field on the surface of the absorber were investigated through the application of the Local Surface Plasmon Resonance (LSPR) theory. Moreover, by modifying the structural parameters, it was found that the absorber possesses excellent physical tuning capabilities. After exploring how changes in the environmental refractive index influence the device's functionality, it was also discovered that the absorber shows remarkable sensitivity to the refractive index, reaching 1840 GHz/RIU. This makes it a highly promising candidate for sensing applications. In conclusion, the design of this absorber offers a novel approach for tunable terahertz metamaterial absorbers, which holds great significance in various fields like detection and sensing.
{"title":"Tunable ultra-sensitive four-band terahertz sensors based on Dirac semimetals","authors":"Zilong Zeng , Hongfu Liu , Huafeng Zhang , Shubo Cheng , Yougen Yi , Zao Yi , Junqiao Wang , Jianguo Zhang","doi":"10.1016/j.photonics.2024.101347","DOIUrl":"10.1016/j.photonics.2024.101347","url":null,"abstract":"<div><div>This article presents a classic three-layer structure terahertz four-band absorber that is composed of Dirac semimetals (BDS) and silica. By regulating the Fermi energy of the Dirac semimetals, it becomes possible to adjust the frequency of the absorption peaks of the absorber. Specifically, when a Fermi energy of 50 meV was chosen for the Dirac semimetal, four absorption peaks were generated within the 4–8 THz range, and all of these peaks boasted absorption rates exceeding 95 %. Firstly, the structural characteristics of the absorber were introduced, and its feasibility was demonstrated by relying on the impedance matching theory. Subsequently, the variations in the electric field on the surface of the absorber were investigated through the application of the Local Surface Plasmon Resonance (LSPR) theory. Moreover, by modifying the structural parameters, it was found that the absorber possesses excellent physical tuning capabilities. After exploring how changes in the environmental refractive index influence the device's functionality, it was also discovered that the absorber shows remarkable sensitivity to the refractive index, reaching 1840 GHz/RIU. This makes it a highly promising candidate for sensing applications. In conclusion, the design of this absorber offers a novel approach for tunable terahertz metamaterial absorbers, which holds great significance in various fields like detection and sensing.</div></div>","PeriodicalId":49699,"journal":{"name":"Photonics and Nanostructures-Fundamentals and Applications","volume":"63 ","pages":"Article 101347"},"PeriodicalIF":2.5,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143167027","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 : 2025-02-01DOI: 10.1016/j.photonics.2024.101345
Vladimir D. Burtsev, Anton V. Nikulin, Tatyana S. Vosheva, Sergey S. Zhukov, Andrey A. Zarenin, Dmitry S. Filonov
Antennas suitable for 6 G applications can potentially operate in the W-band (75–110 GHz), which requires fine manufacturing accuracy, particularly for fine surface processing. Such antennas with fine surfaces can be produced using many different techniques, such as chemical etching, milling, and additive manufacturing. However, even fine manufacturing leads to certain imperfections on the antenna surface that lead to the performance degradation of an antenna. As a result, an undesirable difference between the numerical and experimental results can occur. To study this effect, we performed electromagnetic simulations of surface roughness in multiple conventional electromagnetic devices suitable for 6 G applications. As antennas under investigation, we have chosen a horn antenna and a patch antenna. In addition, we consider a rectangular WR-10 waveguide and a 50 Ohm microstrip transmission line. Surface roughness has been implemented as a set of hemispheres, which are randomly distributed, added, or subtracted on the surface of the antenna. After performing a set of simulations, we evaluated the S-parameters, antenna efficiency, and directivity patterns. The results are then compared with reference devices with ideal surfaces to find the optimal surface requirement for antenna manufacturing.
{"title":"Comprehensive analysis of surface roughness for extremely high frequency antennas","authors":"Vladimir D. Burtsev, Anton V. Nikulin, Tatyana S. Vosheva, Sergey S. Zhukov, Andrey A. Zarenin, Dmitry S. Filonov","doi":"10.1016/j.photonics.2024.101345","DOIUrl":"10.1016/j.photonics.2024.101345","url":null,"abstract":"<div><div>Antennas suitable for 6 G applications can potentially operate in the W-band (75–110 GHz), which requires fine manufacturing accuracy, particularly for fine surface processing. Such antennas with fine surfaces can be produced using many different techniques, such as chemical etching, milling, and additive manufacturing. However, even fine manufacturing leads to certain imperfections on the antenna surface that lead to the performance degradation of an antenna. As a result, an undesirable difference between the numerical and experimental results can occur. To study this effect, we performed electromagnetic simulations of surface roughness in multiple conventional electromagnetic devices suitable for 6 G applications. As antennas under investigation, we have chosen a horn antenna and a patch antenna. In addition, we consider a rectangular W<em>R</em>-10 waveguide and a 50 Ohm microstrip transmission line. Surface roughness has been implemented as a set of hemispheres, which are randomly distributed, added, or subtracted on the surface of the antenna. After performing a set of simulations, we evaluated the S-parameters, antenna efficiency, and directivity patterns. The results are then compared with reference devices with ideal surfaces to find the optimal surface requirement for antenna manufacturing.</div></div>","PeriodicalId":49699,"journal":{"name":"Photonics and Nanostructures-Fundamentals and Applications","volume":"63 ","pages":"Article 101345"},"PeriodicalIF":2.5,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143167887","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 : 2025-02-01DOI: 10.1016/j.photonics.2024.101342
Ying Guo , Xinpeng Tian , Shuguang Li , Jianshe Li , Yuefeng Qi
A microstructured fiber (MSF) sensor utilizing a silver/graphene composite film is proposed and demonstrated. The sensor is fabricated by depositing a nanometer-thick silver film on the MSF and subsequently transferring a graphene film to the silver film using the liquid phase method. The proposed sensor leverages the evanescent field effect of the cladding mode in the MSF, effectively enhancing the surface plasmon resonance (SPR) effect with the assistance of the composite film, which results in a great gain in sensor sensitivity. Simulation results show that the silver/graphene bilayer structure substantially influences the mode field of the sensor and can be well applied in subsequent refractive index sensing research. The experimental findings reveal that the sensitivity of the silver-coated MSF sensor increases to 2916.8 nm/RIU following modification with graphene. The proposed sensor has the potential for applications in biomedical and environmental monitoring.
{"title":"Simulation and experiment of enhanced SPR sensing in silver/graphene-modified microstructured fiber","authors":"Ying Guo , Xinpeng Tian , Shuguang Li , Jianshe Li , Yuefeng Qi","doi":"10.1016/j.photonics.2024.101342","DOIUrl":"10.1016/j.photonics.2024.101342","url":null,"abstract":"<div><div>A microstructured fiber (MSF) sensor utilizing a silver/graphene composite film is proposed and demonstrated. The sensor is fabricated by depositing a nanometer-thick silver film on the MSF and subsequently transferring a graphene film to the silver film using the liquid phase method. The proposed sensor leverages the evanescent field effect of the cladding mode in the MSF, effectively enhancing the surface plasmon resonance (SPR) effect with the assistance of the composite film, which results in a great gain in sensor sensitivity. Simulation results show that the silver/graphene bilayer structure substantially influences the mode field of the sensor and can be well applied in subsequent refractive index sensing research. The experimental findings reveal that the sensitivity of the silver-coated MSF sensor increases to 2916.8 nm/RIU following modification with graphene. The proposed sensor has the potential for applications in biomedical and environmental monitoring.</div></div>","PeriodicalId":49699,"journal":{"name":"Photonics and Nanostructures-Fundamentals and Applications","volume":"63 ","pages":"Article 101342"},"PeriodicalIF":2.5,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143167893","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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