Photonics and Nanostructures-Fundamentals and Applications最新文献

{"title":"Manipulation of the magnetic dipole and electric dipole emissions by the TiO2:Eu3+ inverse opal photonic crystals","authors":"Xin Li ,&nbsp;Yangyang Guo ,&nbsp;Huibing Mao ,&nbsp;Ye Chen ,&nbsp;Jiqing Wang ,&nbsp;Weifeng Fang","doi":"10.1016/j.photonics.2025.101365","DOIUrl":"10.1016/j.photonics.2025.101365","url":null,"abstract":"<div><div>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.</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}

{"title":"Tunable ultra-sensitive four-band terahertz sensors based on Dirac semimetals","authors":"Zilong Zeng ,&nbsp;Hongfu Liu ,&nbsp;Huafeng Zhang ,&nbsp;Shubo Cheng ,&nbsp;Yougen Yi ,&nbsp;Zao Yi ,&nbsp;Junqiao Wang ,&nbsp;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}

{"title":"Comprehensive analysis of surface roughness for extremely high frequency antennas","authors":"Vladimir D. Burtsev,&nbsp;Anton V. Nikulin,&nbsp;Tatyana S. Vosheva,&nbsp;Sergey S. Zhukov,&nbsp;Andrey A. Zarenin,&nbsp;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}

{"title":"Simulation and experiment of enhanced SPR sensing in silver/graphene-modified microstructured fiber","authors":"Ying Guo ,&nbsp;Xinpeng Tian ,&nbsp;Shuguang Li ,&nbsp;Jianshe Li ,&nbsp;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}

{"title":"Voltage-induced transparency of photonic crystal microcavity with chiral liquid crystal layer","authors":"Pavel S. Pankin ,&nbsp;Dmitrii N. Maksimov ,&nbsp;Stepan V. Nabol ,&nbsp;Daniil S. Buzin ,&nbsp;Aleksey I. Krasnov ,&nbsp;Vitaly S. Sutormin ,&nbsp;Denis A. Kostikov ,&nbsp;Abylgazy S. Abdullaev ,&nbsp;Mikhail N. Krakhalev ,&nbsp;Nikita A. Zolotovskii ,&nbsp;Sergey V. Nedelin ,&nbsp;Igor A. Tambasov ,&nbsp;Victor Ya. Zyryanov ,&nbsp;Ivan V. Timofeev","doi":"10.1016/j.photonics.2024.101350","DOIUrl":"10.1016/j.photonics.2024.101350","url":null,"abstract":"<div><div>A resonant microcavity with photonic crystal mirrors and a chiral liquid crystal resonant layer is fabricated. In our experimental set-up the microcavity is illuminated at Brewster’s angle, for which the TM-polarized scattering channels are open, while the TE-polarized channels are closed. Thus, the problem is reduced to two-channel scattering. By applying an external voltage to the resonant layer it is possible to control the position, linewidth and amplitude of multiple resonant lines via changing the radiation decay rate into the scattering channels due to polarization mixing within the chiral layer. It is found, that under a certain value of the applied voltage, the microcavity becomes transparent over a wide spectral range, i.e. none of the resonant modes can be excited.</div></div>","PeriodicalId":49699,"journal":{"name":"Photonics and Nanostructures-Fundamentals and Applications","volume":"63 ","pages":"Article 101350"},"PeriodicalIF":2.5,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143167895","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}

{"title":"Numerical investigations of spin-multiplexing perfect vortex beam generator via dielectric metasurface at telecommunication wavelengths","authors":"Peng Zhou ,&nbsp;Shikai Deng ,&nbsp;Rongrong Guo ,&nbsp;Lei Chen ,&nbsp;Han Ye ,&nbsp;Yumin Liu","doi":"10.1016/j.photonics.2025.101361","DOIUrl":"10.1016/j.photonics.2025.101361","url":null,"abstract":"<div><div>The ring structure radius of a perfect vortex beam (PVB) is invariant to topological charge, offering promising applications in optical communication, particle manipulation, and quantum optics. Integration of PVBs into on-chip optics remains challenging because complex and bulky optical devices are conventionally applied to generate PVBs. This paper reports that PVBs at telecommunication wavelengths can be generated through phase modulation in a single dielectric metasurface. The metasurface enables to generate PVBs with two distinct topological charges under orthogonal circular polarization illumination by employing a spin-multiplexing design strategy. Numerical simulations demonstrate that the radius of a PVB can be manipulated by modifying the structural parameters of the designed metasurface with high design flexibility. Further modulation of the polarization state of the incident light allows for the linear superposition of two PVBs with orthogonal circular polarization states to create a perfect Poincaré beam (PPB), which is characterized by a vectorial optical field on a higher-order Poincaré sphere. Our results introduce a straightforward method to develop versatile nanophotonic platforms for complex structured light generation and polarization engineering.</div></div>","PeriodicalId":49699,"journal":{"name":"Photonics and Nanostructures-Fundamentals and Applications","volume":"63 ","pages":"Article 101361"},"PeriodicalIF":2.5,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143167029","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}

{"title":"Semi-transparent magnetic metasurface screens with modulated impedance for mitigation of radiation in the shadow domain","authors":"M.M. Popov,&nbsp;S.B. Glybovski,&nbsp;D.V. Tatarnikov","doi":"10.1016/j.photonics.2025.101363","DOIUrl":"10.1016/j.photonics.2025.101363","url":null,"abstract":"<div><div>The paper proposes vertically oriented, semi-transparent metasurfaces to suppress radiation from a source in it’s shadow region. These metasurfaces consist of small metallic loop meta-atoms with lumped capacitors, designed such that their magnetic polarization is perpendicular to the incident wave. Semi-transparency is achieved by employing Fano resonance of total reflection, while undesired full transparency resonance is avoided by adjusting the capacitor placement. The metasurfaces admittance profile is analytically synthesized using geometrical optics for large source distances and numerically optimized for practical scenarios with smaller screens and closer source distances. Simulation results demonstrate up to 20 dB radiation suppression across the entire shadow region for screen sizes near 2<em>λ</em> and source distances around 0.5<em>λ</em>, without reducing the gain in the lightened domain.</div></div>","PeriodicalId":49699,"journal":{"name":"Photonics and Nanostructures-Fundamentals and Applications","volume":"63 ","pages":"Article 101363"},"PeriodicalIF":2.5,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143377258","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}

{"title":"Dual-frequency polarization-insensitive and wide-angle metasurface for electromagnetic energy harvesting","authors":"Zhichao Shen ,&nbsp;Bo Lv ,&nbsp;Zao Yi ,&nbsp;Ye Tian ,&nbsp;Yuxi Jin ,&nbsp;Sijie Wang ,&nbsp;Ting Liu ,&nbsp;Shiyun Xia ,&nbsp;Hongyang Mu ,&nbsp;Xuanrui Zhang ,&nbsp;Jinhui Shi","doi":"10.1016/j.photonics.2024.101328","DOIUrl":"10.1016/j.photonics.2024.101328","url":null,"abstract":"<div><div>Recently, various metamaterial-based harvesters have been investigated for harvesting electromagnetic energy from the ambient environment. However, they suffer from narrow absorption bandwidths and low energy harvesting efficiency. In this paper, we propose a miniaturized dual-layer metasurface designed for harvesting ambient electromagnetic energy, featuring wide-angle responsivity and polarization-insensitivity. The metasurface comprises two metal rings and two layers of dielectric substrates. The results demonstrate that the harvester functions within the S- and C-bands, resonating at frequencies of 2.98 GHz and 4.32 GHz, respectively. These resonant frequencies induce electric dipole oscillations, facilitating strong absorption of electromagnetic waves. The harvesting efficiency can reach to 92.5 % and 93.4 % at the two frequencies. Moreover, the harvester performance over a wide range of incidence angles and various polarized angles of the incident wave is analyzed. The harvester can be used for harvesting the redundant electromagnetic energy of communications or radars in the future.</div></div>","PeriodicalId":49699,"journal":{"name":"Photonics and Nanostructures-Fundamentals and Applications","volume":"63 ","pages":"Article 101328"},"PeriodicalIF":2.5,"publicationDate":"2024-11-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142720533","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}

{"title":"Improving the label-free rapid semi-quantification of E.coli by AgNPs-decorated hydrogel inverse opal photonic crystals","authors":"Pham Hong Phong ,&nbsp;Tran Hong Minh ,&nbsp;Vu Thi Thuy Linh ,&nbsp;Nguyen Trong Nghia ,&nbsp;Nghiem Thi Ha Lien ,&nbsp;Nguyen Duc Toan ,&nbsp;Do Tien Phat ,&nbsp;Le Minh Thanh ,&nbsp;Nguyen Thi Hanh","doi":"10.1016/j.photonics.2024.101330","DOIUrl":"10.1016/j.photonics.2024.101330","url":null,"abstract":"<div><div>Using photonic crystal materials for colorimetric sensing, the influences of structure and composition on the photonic bandgap (PBG) of materials are always vital to detection. In this work, the effects of pores in the structure of polyethylene diacrylate-based inverse opal photonic crystal (PEGDA-based IOPC) and the concentration of silver nanoparticles (AgNPs) used for decoration of the IOPC by chemical reaction on the shift of PBG center (λ_rp) have been studied for rapid semi-quantification of <em>Escherichia coli</em> (<em>E. coli</em>). We found that pores in the structure of PEGDA-based IOPC significantly increased the amount of AgNPs attached to this material compared with the structure created by the ordered self-assembly of spherical SiO₂ particles of the parent template, leading to a pronounced red-shift of λ_rp. At the concentration of 20 µg/L AgNPs (<em>C</em>_AgNPs) used for decoration, the shift of λ_rp reached 80 nm due to the increase in the average refractive index (<em>n</em>_{<em>aver</em>.}) of the material. It thus enabled us to observe changes in the color of the reflected light with the naked eye. In addition, since the increase in the concentration of <em>E.coli</em> (<em>C</em>_E.coli) also caused a red-shift of the λ_rp, the <em>C</em>_AgNPs, thus, could be reduced but still give a sufficiently strong shift of λ_rp to detect <em>E.coli</em> at a high level. The spectral position of the reflectance peak changed from green to red with increasing the <em>C</em>_{<em>E.coli</em>} from 50 cfu/mL to 10⁶ cfu/mL at the <em>C</em>_AgNPs = 10 µg/L. These results indicated the potential application of AgNPs decorated PEGDA-based IOPC in rapid semi-quantification of <em>E.coli</em> by the naked eye.</div></div>","PeriodicalId":49699,"journal":{"name":"Photonics and Nanostructures-Fundamentals and Applications","volume":"63 ","pages":"Article 101330"},"PeriodicalIF":2.5,"publicationDate":"2024-11-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142720534","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}

{"title":"Research on terahertz bessel beams based on metasurface","authors":"Haoxiang Li ,&nbsp;Da Mu ,&nbsp;Zongyu Cui ,&nbsp;Jiaojiao Ren ,&nbsp;Jianli Ma ,&nbsp;Yu Zhou ,&nbsp;Zihao Lin","doi":"10.1016/j.photonics.2024.101329","DOIUrl":"10.1016/j.photonics.2024.101329","url":null,"abstract":"<div><div>Traditional terahertz imaging systems are constrained by a limited depth of field, which leads to blurry images outside the focal point. To address this limitation, we designed a metasurface with rectangular pillar-structured units based on the transmission phase using a ceramic slurry. Using the finite-difference time-domain method for calculations and simulations, the arranged metasurface unit cells in a ring configuration produced a Bessel beam with a non-diffracting distance of 30 mm. The study found that the phase gradient, light source divergence angle, material refractive index variation, and processing errors influenced the beam propagation characteristics. Notably, the phase gradient and light source divergence angle are directly proportional to the non-diffracting distance and significantly affect the performance of imaging system. The metasurface designed in this study enhances the depth of field of terahertz imaging systems and offers novel insights into the manipulation and application of terahertz beams. This innovation has potential applications in fields such as terahertz imaging and nondestructive testing.</div></div>","PeriodicalId":49699,"journal":{"name":"Photonics and Nanostructures-Fundamentals and Applications","volume":"63 ","pages":"Article 101329"},"PeriodicalIF":2.5,"publicationDate":"2024-11-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142747888","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}