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Flexible luminescent solar concentrator based on epoxy resin: A simple, cost-effective approach for enhanced energy harvesting

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SOLAR ENERGY MATERIALS AND SOLAR CELLS 2025年 282卷

作者： Pashabeygi, Anita Fathalizadeh, Nima Ahmadi-Kandjani, Sohrab Univ Tabriz Fac Phys Tabriz 51663165 Iran Univ Tabriz Res Inst Appl Phys & Astron RIAPA Tabriz 51663165 Iran Univ Tabriz Ctr Photon Excellence Tabriz Iran

The future of humanity and the planet hinges upon our ability to generate clean, economically viable, and ecofriendly sources of energy. Flexible luminescent solar concentrators (FLSCs) have garnered significant interest owing to their wide range of potential applications, including, but not limited to, electric vehicle roof panels, camping tents, architectural structures, clothing, and outdoor equipment. In this study, a cheap commercially available polyamide-based epoxy resin was utilized to fabricate FLSCs without the incorporation of any additives (such as fluorescent dyes, quantum dots, etc. FLSCs, as fabricated, present several advantages, such as costeffectiveness, user-friendliness, stability in diverse environmental conditions, and a notable decrease in expense compared to alternative materials employed in LSC production. In comparison to a pure PMMA slab with the same dimensions, the power conversion efficiency (PCE) exhibited a significant improvement of 42.11 %. To investigate the bending effect, the FLSC was bent to a very small radius of curvature of 0.7 cm. The findings showed that the optimum curvature radius, which gives the highest power conversion efficiency, is 1.8 cm, especially for direct normal irradiation. Furthermore, the fabricated FLSCs exhibited 1700 damage-free bending cycles at 45 degrees C(800 bending cycles at room temperature). Also, the results showed that the presented FLSCs have good performance under indoor lighting. Our results show that this epoxy resin can be easily used in all conceivable applications for FLSCs.

关键词： Flexible luminescent solar concentrator Epoxy resin waveguides Power conversion efficiency Bending cycles Outdoor-indoor applications

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Dual-Band Circularly Polarised Asymmetric Linear-Tapered Horn Antenna for Feeder of Synthetic Aperture Radar Onboard Microsatellite

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IET MICROWAVES ANTENNAS & PROPAGATION 2025年第1期19卷

作者： Yusuf, Derry Permana Sumantyo, Josaphat Tetuko Sri Yoshimoto, Yuki Gao, Steven Ito, Koichi Chiba Univ Grad Sch Sci & Engn Dept Environm Remote Sensing Chiba Japan Univ Sebelas Maret Dept Elect Engn Surakarta Indonesia Chiba Univ Ctr Environm Remote Sensing Chiba Japan Univ Indonesia Fac Engn Dept Elect Engn Depok Indonesia Sumitomo Met Min Co Ltd Comp Aided Engn & Dev Dept Tokyo Japan Chinese Univ Hong Kong Dept Elect Engn Hong Kong Peoples R China

This paper presents a novel dual-band waveguide-fed circularly polarised (CP) horn antenna for the feeder of synthetic aperture radar (SAR) onboard microsatellite. The proposed horn antenna consists of an asymmetric linearly tapered slot and a waveguide feed. The C-/X-band left-hand circular polarisation (LHCP) design was simulated, and the 3D-printed prototype was fabricated to validate the simulation and measured in an anechoic chamber. The measured circularly polarised (CP) antenna can achieve dual-band operations with a 3 dB axial ratio bandwidth of 40% (5-6.5 GHz;8.5-10 GHz), VSWR less than 1.4 in the operating band and a peak gain of 13.6 dBic (5.3 GHz) and 18.5 dBic (9.4 GHz). The measured half-power beamwidth (HPBW) at C-band and X-band frequencies in the xz-plane and yz-plane are achieved at 26 degrees/37 degrees and 18 degrees/23 degrees, respectively. The proposed antenna offers several advantages over current CP antenna designs, including simpler design, low-cost manufacturing, better impedance matching, wider AR bandwidth and lower sidelobe levels.

关键词： antennas horn antennas synthetic aperture radar waveguide antennas waveguides

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On-Chip Cascaded Metasurfaces for Visible Wavelength Division Multiplexing and Color-Routing Meta-Display

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NANO LETTERS 2025年第6期25卷 2452-2458页

作者： Rao, Runlong Shi, Yangyang Wang, Zejing Wan, Shuai Li, Zhongyang Wuhan Univ Elect Informat Sch Wuhan 430072 Peoples R China Wuhan Univ Sch Microelect Wuhan 430072 Peoples R China Wuhan Inst Quantum Technol Wuhan 430206 Peoples R China

Integrating metasurfaces on-chip offers a promising strategy for modulating and extracting guided waves, suggesting tremendous applications in compact wearable devices. However, despite the full acquisition of on-chip manipulation of optical parameters, including phase, amplitude, and polarization, the functionality of on-chip metasurfaces remains limited by the lack of wavelength selectivity. Here, an on-chip approach to differentiate wavelength components is proposed in the visible regime for wavelength division multiplexing (WDM). Through horizontally cascading on-chip meta-atoms with structural dimension variation and optimization, different wavelength components propagating along the waveguide would be selectively extracted, realizing meta-demultiplexing functionality. More intriguingly, color nanoprinting images or holographic displays can be correspondingly enabled. This approach surpasses conventional free-space meta-devices in terms of exhibiting improved wavelength-selective allocation and eliminating the energy waste caused by spatial multiplexing. We envision that such an on-chip cascading strategy paves the way for next-generation WDM devices in photonic integrated circuits and wearable miniature meta-displays.

关键词： On-chip metasurfaces Wavelength divisionmultiplexing Wavelength selectivity Color-routingdisplay waveguides

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Fiber Tip Empowered by Axial-Asymmetric Four-Sector Nanostructure for Broad-Angle Light Coupling

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LASER & PHOTONICS REVIEWS 2025年第5期19卷

作者： Wang, Jianwei Yermakov, Oleh Gu, Yitong Zeisberger, Matthias Fischer, Bennet Yu, Fei Yu, Chunlei Hu, Lili Schmidt, Markus A. Wang, Ning Univ Chinese Acad Sci Hangzhou Inst Adv Study Hangzhou 310024 Peoples R China Chinese Acad Sci Shanghai Inst Opt & Fine Mech Shanghai 201800 Peoples R China Leibniz Inst Photon Technol Albert Einstein Str 9 D-07745 Jena Germany Kharkov Natl Univ Svobody Sq 4 UA-61022 Kharkiv Ukraine Otto Schott Inst Mat Res Fraunhoferstr 6 D-07743 Jena Germany

Efficient light coupling into the fiber waveguides is important in numerous applications, while the low in-coupling coefficients of commercially available step-index fibers significantly narrow their application domains. It is recently introduced that well-defined periodic nanostructures, such as annulus gratings, allow to substantially boost in-coupling coefficients. In this study, the genetic algorithm is applied for the optimization of trapezoidal polymer gratings. The experimental data showcase multiply enhanced light coupling at preselected incident angles with respect to a bare fiber. As a breakthrough result, the development of an axial-asymmetric four-sector grating, reaching the percentage level of light coupling efficiency in a broad angular range from 0 degrees$<^>{\circ }$ to 70 degrees$<^>{\circ }$ that outperforms axial-symmetric gratings by about order of magnitude. Further, the high average light coupling efficiency is verified in the finite angular intervals at multiple wavelengths of 650, 1000, and 1550 nm. This solution highlights the enhancement of algorithm-designed structures axially-asymmetric systems for fiber-based highly efficient light collections, that will further benefit extensive applications such as wide-field endoscopies.

关键词： energy collection gratings light coupling waveguides

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High-sensitivity polymer-based bimodal plasmonic refractive index sensors with polymer cladding

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OPTICS EXPRESS 2025年第5期33卷 9813-9824页

作者： Bhalerao, Omkar Suckow, Stephan Windgassen, Horst Biller, Harry Fotiadis, Konstantinos Simos, Stelios Chatzianagnostou, Evangelia Spasopoulos, Dimostheni Das, Pratyusha Markey, Laurent Weeber, Jean-claude Pleros, Nikos Schirmer, Matthia Lemme, Max C. AMO GmbH Otto Blumenthal Str 25 D-52074 Aachen Germany Rhein Westfal TH Aachen Chair Elect Devices Otto Blumenthal Str 25 D-52074 Aachen Germany Allresist GmbH Biotop 14 D-15344 Strausberg Germany Balkan Ctr CIRI AUTH Bldg A10th KmThessaloniki Thermi Rd Thessaloniki 57001 Greece Univ Bourgogne Europe Lab Interdisciplinaire Carnot Bourgogne ICB CNRS UMR 6303 BP 47870 F-21078 Dijon France

Plasmonic refractive index sensors are essential for detecting subtle variations in the ambient environment through surface plasmon interactions. Current efforts utilizing CMOScompatible, plasmo-photonic Mach-Zehnder interferometers with active power balancing exhibit high sensitivities at the cost of fabrication and measurement complexity. Alternatively, passive bimodal plasmonic interferometers based on SU-8 waveguides offer cost-effectiveness and a smaller device footprint. However, their waveguides are exposed to ambient conditions and currently lack the necessary opto-mechanical isolation. In this work, we introduce the new SX AR LWL 2.0 polymer cladding material, which provides a high refractive index contrast to the SU-8 core, while ensuring compatibility with SU-8 waveguides. Our sensors consist of an aluminum plasmonic stripe and a bilayer SU-8 photonic waveguide core which is cladded with the SX AR LWL 2.0 polymer. They achieve a sensitivity of (6108 +/- 13) nm/RIU (refractive index unit), where the error indicates the data fitting tolerance, and a limit of detection of 1.6 x 10(-7)RIU, in aqueous solutions, surpassing both traditional and polymer-based bimodal plasmo-photonic sensors. This new cladding material paves the way for more efficient and integrated bimodal plasmonic refractive index sensing platforms for a wide range of applications.

关键词： CMOS technology Fiber optic sensors Photonic devices Silicon nitride Waveguide cores waveguides

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Microfabricated Waveguide Terminations for Wideband and Low-Power THz Applications

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IEEE TRANSACTIONS ON TERAHERTZ SCIENCE AND TECHNOLOGY 2025年第2期15卷 181-190页

作者： Lopez, Cristian Daniel Flosason, Karl Birkir Meledin, Denis Helldner, Leif Ferm, Svenerik Belitsky, Victor Desmaris, Vincent Chalmers Univ Technol Dept Space Earth & Environm Grp Adv Receiver Dev GARD S-41296 Gothenburg Sweden

This article presents the design, simulation, microfabrication, and characterization of broadband waveguide terminations intended as drop-in components in waveguide blocks. Two types of terminations were developed, fabricated, and characterized. The first type employs a quartz-based E-probe to couple to a waveguide, integrating an on-substrate titanium nitride (Ti-N) alloy resistive absorber with broadband tuning circuitry. This design achieves a return loss of better than 20 dB over the 260-375 GHz frequency range. The second type features a finline to slotline transition, constructed from a 30 mu m thick Si membrane covered with high resistivity Ti-N alloy. This load demonstrates a return loss of better than 20 dB across the 210-380 GHz band. In order to ensure the required performance of the loads at cryogenic temperatures, the sheet resistance of the employed Ti-N resistive film was characterized from room temperature to 4K employing a closed-cycle cryostat and a four-probe measurement system. For comparative purposes, the room temperature performance of terminations employing a traditional Eccosorb material was measured and compared with the proposed waveguide terminations. Furthermore, the sideband rejection ratio of a 2SB superconductor-insulator-superconductor mixer was evaluated at cryogenic temperatures using the proposed finline-based terminations for LO directional couplers and 90 degrees RF hybrids in comparison with the Eccosorb made terminations. The measurements showed that the performance of the proposed terminations outperforms those achieved with Eccosorb absorbers at room temperature and is comparable at cryogenic temperatures.

关键词： Microstrip Impedance Substrates Loaded waveguides Propagation losses Power transmission lines Resistance Mixers Microstrip components Gold 2SB superconductor-insulator-superconductor (SIS) mixer Eccosorb E-probe finline load microfabrication noise temperature terahertz waveguides

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Modeling of Tunable Electronic Waveguide Devices in Graphene Using Conservative Higher Order Time Stepping

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IEEE TRANSACTIONS ON COMPONENTS PACKAGING AND MANUFACTURING TECHNOLOGY 2025年第1期15卷 30-38页

作者： Vanderstraeten, Emile Ginste, Dries Vande Univ Ghent Dept Informat Technol B-9052 Ghent Belgium

An accurate technique leveraging conservative higher order time stepping is proposed to analyze electrostatically induced waveguides in graphene. These highly tunable 1-D electronic channels are a promising interconnect alternative for graphene nanoribbons (GNRs) and carbon nanotubes (CNTs) to be used in future integrated circuits (ICs). A detailed discussion of the eigenmodes of these waveguides is presented and specific attention is paid to the orthogonality relationships, which are remarkably similar to their electromagnetic counterpart. Furthermore, it is demonstrated that the addition of a vector potential does not affect the long-term properties of the time stepping scheme. To showcase the accuracy and applicability of the constructed technique, two practical electronic waveguide devices are simulated: a dot resonator and a 50/50 splitter containing no bends. The dot resonator exhibits frequency-selective behavior that proves to be tunable by both the scalar and vector potentials, while the desired output characteristic is obtained for the splitter after carefully tuning the confining potentials.

关键词： Graphene Electric potential Electromagnetic waveguides Vectors Electrostatics Eigenvalues and eigenfunctions Mathematical models higher order time stepping quantum mechanical modeling waveguides

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Emergent Oscillating Bound States in a Semi-Infinite Linear Waveguide with a Point-Like Λ-Type Quantum Emitter Driven by a Classical Field

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ADVANCED QUANTUM TECHNOLOGIES 2025年

作者： He, Yuping Sun, Ge Li, Jing Yang, Ya Lu, Jing Zhou, Lan Hunan Normal Univ Synerget Innovat Ctr Quantum Effects & Applicat Key Lab Matter Microstruct & Funct Hunan ProvXian Key Lab Low Dimens Quantum Struct & Quantum Contro Changsha 410081 Peoples R China Hunan Normal Univ Dept Phys Changsha 410081 Peoples R China Hunan Normal Univ Inst Interdisciplinary Studies Changsha 410081 Peoples R China

An oscillating bound state is a phenomenon where excitations mediated by the continuum modes oscillate persistently. Although it is generated by the superposition of two bound states in the continuum (BICs), such phenomenon is said to be unique to giant atoms. The phenomenon of an oscillating bound state with an alternative waveguide QED system is presented, which is a one dimensional (1D) semi-infinite waveguide coupled to a point-like quantum emitter. This point-like quantum emitter is Lambda-type quantum system with one transition driven by a classical field.

关键词： waveguides

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THz wave transmission within the metal film coated double-dielectric-slab waveguides and the tunable filter application

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OPTICS COMMUNICATIONS 2015年 351卷 103-108页

作者： Liu, Jiamin Liang, Huawei Zhang, Min Su, Hong Shenzhen Univ Coll Elect Sci & Technol Shenzhen 518060 Peoples R China Shenzhen Univ Shenzhen Key Lab Laser Engn Shenzhen 518060 Peoples R China Shenzhen Univ Key Lab Adv Opt Precis Mfg Technol Guangdong Higher Educ Inst Shenzhen 518060 Peoples R China

We propose a metal film coated double-dielectric-slab waveguide for guiding THz wave. Detailed comparisons of transmission characteristics of the coated and uncoated double-dielectric-slab waveguides are given. The comparisons of different slab materials are also given. We put forward using the measureable cut-off frequency of the coated waveguides for tunable filter. The tunable sensitivities to the thickness of the slab t and the air interval w are discussed. We find that for Polystyrene slab at t=0.0380 mm, the theoretical tunable sensitivity of cut-off frequency on w can be 7.65 THz/mm. (C) 2015 Elsevier B.V. All rights reserved.

关键词： waveguides Far-infrared Planar waveguides

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Improved multimodal methods for the acoustic propagation in waveguides with finite wall impedance

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WAVE MOTION 2015年 54卷 1-10页

作者： Felix, Simon Maurel, Agnes Mercier, Jean-Francois Univ Maine CNRS LAUM F-72085 Le Mans France ESPCI ParisTech CNRS Inst Langevin F-75005 Paris France ENSTA ParisTech INRIA CNRS Poems F-91762 Palaiseau France

We address the problem of acoustic propagation in waveguides with wall impedance, or Robin, boundary condition. Two improved multimodal methods are developed to remedy the problem of the low convergence of the series in the standard modal approach. In the first improved method, the series is enriched with an additional mode, which is thought to be able to restore the right boundary condition. The second improved method consists in a reformulation of the expansions able to restore the right boundary conditions for any truncation, similar to polynomial subtraction technique. Surprisingly, the first improved method is found to be the most efficient. Notably, the convergence of the scattering properties is increased from N-1 in the standard modal method to N-3 in the reformulation and N-5 in the formulation with a supplementary mode: The improved methods are shown to be of particular interest when surface waves are generated near the impedance wall. (C) 2014 Elsevier B.V. All rights reserved.

关键词： waveguides Modal method Robin condition Boundary modes

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