Optik最新文献

{"title":"Star-shaped indium tin oxide based transparent optical antenna for nanophotonic applications","authors":"Ashish Singh ,&nbsp;S. Kavitha ,&nbsp;Mohammad Aneesh ,&nbsp;Mohammad Gulman Siddiqui","doi":"10.1016/j.ijleo.2025.172473","DOIUrl":"10.1016/j.ijleo.2025.172473","url":null,"abstract":"<div><div>A star-shaped indium tin oxide-based transparent plasmonic nano-antenna is designed and studied for nanophotonic applications using a silicon dioxide substrate. The dispersive properties and epsilon near zero wavelength of the indium tin oxide and silicon dioxide are analysed using the Drude and Lorentz formulas. The design of the nanostructure is optimised using CST Microwave Studio through the design parameters such as length, width of the conducting patch and substrate. The optimised results exhibit that the proposed transparent conducting patch is operating at 29.87 THz with a gain of 7.04 dBi. Further, the S₁₁ coefficient of the proposed antenna is −41.84 dB with a bandwidth of 4 THz at the resonance. The proposed transparent antenna exhibits field enhancement factors of 375 and 240 for E and H fields, respectively. The nanocircuit of the transparent antenna is derived and the simulated results are validated using the proposed model. The designed transparent antenna is suitable to use in the nanophotonic integrated circuits since it exhibits plasmonic resonance characteristics.</div></div>","PeriodicalId":19513,"journal":{"name":"Optik","volume":"337 ","pages":"Article 172473"},"PeriodicalIF":3.1,"publicationDate":"2025-07-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144572218","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":"Modeling of spectral reflectance characteristics in a semi-distributed interferometer sensor as a randomly segmented structure","authors":"Milan S. Kovačević ,&nbsp;Daniele Tosi ,&nbsp;Wilfried Blanc ,&nbsp;Ljubica Kuzmanović ,&nbsp;Vladimir Marković","doi":"10.1016/j.ijleo.2025.172472","DOIUrl":"10.1016/j.ijleo.2025.172472","url":null,"abstract":"<div><div>In this work, a refractive-index fiber-optic sensor, referred to as a semi-distributed interferometer (SDI), was modeled to estimate spectral reflectance. The SDI originates from a Fabry–Pérot (FP) structure formed between a cleaved fiber tip and the reflective interface between a single-mode fiber and a high-scattering fiber with a core doped with magnesium silicate nanoparticles. We modeled the SDI as a multilayer system of randomly distributed FP interferometers, each characterized by a different refractive index and length. The reflectance and transmittance of the multilayer structure were numerically calculated using Fresnel reflection and the standard two-mirror FP transmission formula. This approach enables the calculation of the spectral characteristics of the interferometer under the assumption of single reflections at each layer surface. For simplicity, all layer boundaries were assumed to be flat and orthogonal to the beam propagation axis, aligning with the typical configuration of real systems. A superposition of all possible multiply reflected beams was analyzed using a general theory for multi-mirror interferometers. Specifically, the m-th backscattered wave, which passes through m dielectric layers, reflects, and propagates in the opposite direction, was examined. The spectral and sensitivity analyses were performed for several refractive index values. The results demonstrated excellent agreement with previously reported experimental findings.</div></div>","PeriodicalId":19513,"journal":{"name":"Optik","volume":"337 ","pages":"Article 172472"},"PeriodicalIF":3.1,"publicationDate":"2025-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144572214","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":"Protection of glass against counterfeiting: A review of modern optical techniques","authors":"Achania Chandran ,&nbsp;Dhanya Sunil ,&nbsp;Sudha D. Kamath","doi":"10.1016/j.ijleo.2025.172474","DOIUrl":"10.1016/j.ijleo.2025.172474","url":null,"abstract":"<div><div>Glass is a versatile material with exclusive features, making it ideal for diverse applications. However, counterfeiting in glass products is a growing concern, especially in industries where quality and authenticity are crucial. Advancements in optical technologies including luminescent materials and novel labeling techniques enhance security and authenticity of glass products, addressing the challenges posed by counterfeiting. The article navigates through the key glass synthesis methods including melt-quenching, sol-gel, and electrospinning, emphasizing their role in improving authentication of genuine glass products. Further, this review explores the current trends in the anti-counterfeiting strategies for glass, highlighting the diverse optical approaches that leverage ultraviolet / near-infrared emissions, heating, laser-induced localized crystallization, etc. to unveil the concealed features. Moreover, the potential of glass as an optical data storage medium is also examined. Furthermore, the article addresses the key challenges associated with implementing optical security features in glass and discusses future research opportunities to enhance the existing techniques.</div></div>","PeriodicalId":19513,"journal":{"name":"Optik","volume":"337 ","pages":"Article 172474"},"PeriodicalIF":3.1,"publicationDate":"2025-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144570101","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":"A terahertz multiband metamaterial based rectangular loop antenna with 2×2 split ring resonator arrays and photonic band gap structures","authors":"Djamila Ziani ,&nbsp;Yacine Cherfi ,&nbsp;Allel Mokaddem ,&nbsp;Mehdi Rouissat ,&nbsp;Mohamed Belkheir ,&nbsp;Yacine Guettaf ,&nbsp;Pascal Lorenz","doi":"10.1016/j.ijleo.2025.172464","DOIUrl":"10.1016/j.ijleo.2025.172464","url":null,"abstract":"<div><div>The THz frequency band, ranging from 0.1 THz to 10 THz, is gaining increasing attention dueto its ability to provide high bandwidth, making it ideal for a wide range of emerging applications, including high-speed wireless communication systems. However, designing wireless devices for this band requires meeting stringent criteria such as sustainability, environmental resilience, flexibility, and cost-effectiveness. These challenges have driven the exploration of new materials and advanced design strategies to optimize performance while fulfilling these essential requirements. This study presents the design of a THz antenna that integrates Metamaterial (MTM) structures, 2 × 2 Split-Ring Resonator (SRR) arrays, and Photonic Band Gap (PBG) structures to enhance its overall performance. The proposed rectangular loop antenna, featuring compact dimensions of 240 µm × 230 µm × 45 µm for Kapton and 255 µm × 355 µm × 45 µm for Quartz Fabric, exhibits a multiband response with distinct resonances centered at 0.47 THz, 0.85 THz, and 1.1 THz for the Kapton-based design, and at 0.5 THz and 0.88 THz for the Quartz Fabric-based design. These responses effectively cover the 0.4–1.2 THz frequency range. The multiband behavior of the antenna significantly broadens its potential applications across various fields, including biomedical imaging, security and threat detection, THz spectroscopy, THz communications, non-destructive testing (NDT), and agriculture and food quality monitoring. Furthermore, the use of environmentally friendly and cost-effective materials, such as single-walled carbon nanotubes (SWCNTs), offers a promising pathway toward the development of sustainable, high-performance antennas. The antenna exhibits excellent impedance matching, with S11 values ensuring efficient energy transfer and minimal reflection across the operating frequency range. A comprehensive parametric study reveals significant bandwidth improvements, with Kapton achieving a bandwidth of 45–51 GHz and a realized gain of 2.95 dBi, while Quartz Fabric achieves 45–48 GHz with a realized gain of 3.71 dBi. These results confirm that the integration of MTM and PBG structures substantially enhances the antenna’s performance in terms of bandwidth, gain, and efficiency.</div></div>","PeriodicalId":19513,"journal":{"name":"Optik","volume":"337 ","pages":"Article 172464"},"PeriodicalIF":3.1,"publicationDate":"2025-06-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144514052","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":"Reflection in aperiodic cylindirical one-dimensional photonic crystals","authors":"Ferhat Nutku ,&nbsp;Sakine Gökşin","doi":"10.1016/j.ijleo.2025.172457","DOIUrl":"10.1016/j.ijleo.2025.172457","url":null,"abstract":"<div><div>In this article, we explore the reflection from one-dimensional cylindrical photonic crystal structures. The core of investigated structures consists of stacked Gallium Arsenide (GaAs) and Aluminum Arsenide (AlAs) semiconductor disk-shaped layers, which are arranged according to periodic, Fibonacci, Thue–Morse, Double-Period, and Rudin-Shapiro sequences. By systematically calculating and comparing their reflectance spectra to conventional periodic designs using CAMFR software for rigorous numerical simulations, this research demonstrates significant improvements in tailoring optical responses. A key finding is that aperiodic structures generate multiple sharp reflection peaks when compared to periodic ones. Increasing the order of these aperiodic sequences amplifies the number of reflection peaks, enabling multi-wavelength selectivity. Furthermore, enhancing the number of periods 1 to 4 within these sequences sharpens peak widths and boosts reflectance intensity, with Double-Period structures achieving the highest reflectivity up to 25%. It is concluded that these multi-peaks in reflectance spectra can be utilized in the development of photonic crystal based sensors.</div></div>","PeriodicalId":19513,"journal":{"name":"Optik","volume":"337 ","pages":"Article 172457"},"PeriodicalIF":3.1,"publicationDate":"2025-06-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144549745","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":"Impact of geometric and optical parameters on the properties of a loop structure with resonator: Applications to filtering and sensing","authors":"El-Aouni Mimoun ,&nbsp;Ben-Ali Youssef ,&nbsp;Barkani Jamal ,&nbsp;Ezzarfi Abdelouahid ,&nbsp;Bria Driss","doi":"10.1016/j.ijleo.2025.172461","DOIUrl":"10.1016/j.ijleo.2025.172461","url":null,"abstract":"<div><div>This work, present a high-performance photonic filter and plasmonic sensor. Firstly, the filter configuration consists of an asymmetrical 1D loop (ring) and six symmetrical resonators. The optimum filter is achieved by controlling the geometrical parameters of the 1D structure. In this context, the results present the appearance three resonance modes in the GHz range frequency and geometrical parameters in millimeters, with high performances such as transmission rate and high quality factors. Secondly, a 2D plasmonic structure based on MIM is investigated as a refractive index plasmonic sensor in the visible range. The sensitivity of this device reaches 912.3 nm/RIU and the detection limit DL = 0.005 RIU.</div></div>","PeriodicalId":19513,"journal":{"name":"Optik","volume":"337 ","pages":"Article 172461"},"PeriodicalIF":3.1,"publicationDate":"2025-06-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144514051","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":"Controlled hybridization of gaas-based vertically coupled hybrid plasmonic waveguide for low-loss nanoscale optical confinement","authors":"Swati Rajput ,&nbsp;Adithya Sekhar","doi":"10.1016/j.ijleo.2025.172460","DOIUrl":"10.1016/j.ijleo.2025.172460","url":null,"abstract":"<div><div>Plasmonic waveguiding stands at the forefront of nanophotonic innovation, offering immense potential for the development of compact and efficient nanophotonic devices. Despite its promise, this field has faced challenges, particularly in managing significant propagation losses that hinder device performance and efficiency. Addressing this critical barrier, we present an engineered GaAs-based vertically coupled hybrid plasmonic waveguide (VCHPW) that leverages controlled hybridization to achieve ultra-low-loss nanoscale optical confinement. Our innovative vertical coupling design enhances the interaction between plasmonic and dielectric layers, leading to superior mode confinement and substantially reduced propagation losses. The state-of-the-art design achieves remarkable performance, with ultra-low propagation losses of 0.004 dB/μm over a propagation length of 790 μm at a wavelength of 1.35 μm, and 0.0007 dB/μm over a propagation length of 5330 μm at a wavelength of 1.65 μm. Furthermore, the device exhibits a figure of merit ranging from 2280 to 5700. In comparison to conventional GaAs-based hybrid plasmonic waveguides, our proposed device demonstrates a reduction in loss by a factor of over 100. Additionally, it shows a significantly enhanced figure of merit and extended propagation length, marking an advancement in plasmonic waveguide performance. This meticulous engineering ensures that our VCHPW not only surpasses traditional hybrid plasmonic waveguides in terms of efficiency and confinement but also offers scalability and integration potential. These attributes are essential for future high-performance nanophotonic systems for communication and sensing technologies.</div></div>","PeriodicalId":19513,"journal":{"name":"Optik","volume":"338 ","pages":"Article 172460"},"PeriodicalIF":3.1,"publicationDate":"2025-06-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144656376","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":"One-step ultrasonic irradiation method for Bi-doped CsPbI2Br nanocrystals: An interplay of doping mechanisms","authors":"Reeba Mary Thomas ,&nbsp;Mohd Bilal Khan ,&nbsp;Sultan Ahmad ,&nbsp;Ankur Mishra ,&nbsp;Faheem Ahmed ,&nbsp;Abdullah Alsulami ,&nbsp;Zishan Husain Khan","doi":"10.1016/j.ijleo.2025.172463","DOIUrl":"10.1016/j.ijleo.2025.172463","url":null,"abstract":"<div><div>Doping metal ions into a perovskite lattice is an effective strategy for tailoring the intrinsic properties of perovskite nanocrystals (NCs). Herein, we report the synthesis of red emitting Bi³⁺ doped CsPbI₂Br nanocrystals (NCs) using a one-step ultrasonic irradiation method. Thorough investigations of the effect of Bi³⁺ doping on the photophysical properties of CsPbI₂Br NCs were presented which indicated that the Bi³⁺ ions can be incorporated at interstitial sites, at substitutional site or at both the sites by carefully optimising the feeding concentration of Bi³⁺ ions in the precursor solution. Structural studies showed that substitutional doping was observed for 3.4 % Bi³⁺ doped CsPbI₂Br NCs which resulted in the lattice contraction and shortened the bond length of B–X bond, thereby suppressing the distortion of [BX₆]^4- octahedra of ABX₃ perovskite structure, thus, improved the photophysical properties of CsPbI₂Br NCs. For 3.4 % Bi³⁺ doped CsPbI₂Br NCs, a reduction in the bandgap and 82 % increase in average PL decay time were observed as compared to that of the pure CsPbI₂Br NCs. The prepared Bi-doped CsPbI₂Br NCs with tuned bandgap and enhanced optical properties presented here could be used as potential candidate for future photovoltaic applications.</div></div>","PeriodicalId":19513,"journal":{"name":"Optik","volume":"337 ","pages":"Article 172463"},"PeriodicalIF":3.1,"publicationDate":"2025-06-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144517748","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":"Development of inorganic perovskite quantum dots-based optical sensor for toxic Cd2+ metal ion detection","authors":"Chieh-Wen Hsieh,&nbsp;Rajan Kumar Singh,&nbsp;Mohan Lal Meena,&nbsp;Shao-An Lu,&nbsp;Karan Kumar Gupta,&nbsp;Bo Chen Lin,&nbsp;Chung-Hsin Lu","doi":"10.1016/j.ijleo.2025.172462","DOIUrl":"10.1016/j.ijleo.2025.172462","url":null,"abstract":"<div><div>CsPbBr₃-CsPb₂Br₅ nanocrystals (CNCs) with high photoluminescence intensity were synthesized using the ultrasonication process under ambient conditions. The prepared nanocrystals were found to be quenched in luminescence in the presence of cadmium (Cd²⁺) ions due to the decomposition of highly luminescent CsPbBr₃. The time-resolved photoluminescence lifetime of the Cd²⁺ ions-quenched CNCs was decreased from 26.61 to 19.84 ns. The decreased lifetime of the quenched sample indicated that the excitons of the nanocrystals were trapped from Cd²⁺ ions and released energy in non-luminous paths. The broad detection range of Cd²⁺ ions using CNCs was from 10⁻³ to 10⁻⁵ M. The synthesized nanocrystals modified with ammonia hydroxide displayed strong fluorescence quenching. The addition of ammonia hydroxide to CNCs reduced the amounts of ligands on the surface of nanocrystals, which enhanced the interaction between Cd²⁺ ions and CNCs. The interaction of Cd²⁺ ions with CNCs led to strong fluorescence quenching. The detection limit of Cd²⁺ ions using the ammonia hydroxide-modified CNCs was reached to 10⁻⁶ M, revealing the high sensitivity of the prepared nanocrystals.</div></div>","PeriodicalId":19513,"journal":{"name":"Optik","volume":"337 ","pages":"Article 172462"},"PeriodicalIF":3.1,"publicationDate":"2025-06-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144491408","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 induced transparency of graphene-assisted micro-resonators, nonreciprocal transmission, fast and slow light","authors":"Kousik Mukherjee ,&nbsp;Paresh Chandra Jana","doi":"10.1016/j.ijleo.2025.172459","DOIUrl":"10.1016/j.ijleo.2025.172459","url":null,"abstract":"<div><div>We theoretically analyze optically induced transparency and the related slowing of light in a graphene-assisted coupled micro-resonators. One of the resonators provides gain by optical pumping via Raman scattering and other one contributes symmetric loss induced by graphene layers. The absorption and dispersion profile of the probe field are illustrated in detail under different system parameters. The intra-cavity field intensities suffer revival and suppression which can be tuned by graphene induced loss. The present system shows nonreciprocal transmission. The maximum value of the isolation ratio reaches about 16 dB under optimization of different system parameters. The phase of the output field exhibits both anomalous and normal dispersion and this confirms the group velocity is both negative and positive. The present system shows slow-to-fast light propagation. This is useful for optical isolation, optical sensing and ultra-fast signal processing. These findings supply a platform for controlling light propagation using nano-fabricated devices.</div></div>","PeriodicalId":19513,"journal":{"name":"Optik","volume":"337 ","pages":"Article 172459"},"PeriodicalIF":3.1,"publicationDate":"2025-06-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144491407","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}