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Substrate-modulated directional far field scattering behavior of individual plasmonic nanorods
摘要： Steering the energy of the incident light into the specific directions by using plasmonic nanostructures plays a key role for future micro-nano photonic integration and optical imaging systems, but the influence of the dielectric substrate on the full-space far-field scattering image of metal nanostructures remains unintuitive. In this paper, the influence of dielectric substrate on the far-field scattering behavior of surface plasmon resonance mode is systematically investigated. By using a simple model, we found that the dielectric substrate could suppress the backscattering energy of plasmon mode. The forward scattering energy of plasmon mode will be concentrated as the refractive index of the substrate increased. We also realized a directional forward scattering of plasmon mode energy by combining the dielectric substrate and dielectric/metal structures. Our research provides a new strategy for the directional control of the incident light energy in a dielectric substrate.
关键词： Lossless dielectric substrate,Surface plasmon resonance,Far field pattern,Directional radiation,Nanorod
更新于2025-09-23 15:19:57
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[IEEE 2019 International Conference on Microwave and Millimeter Wave Technology (ICMMT) - Guangzhou, China (2019.5.19-2019.5.22)] 2019 International Conference on Microwave and Millimeter Wave Technology (ICMMT) - Slot Coupled Directional Wideband Millimeter-Wave Antenna
摘要： A wideband millimeter-wave (mm-wave) antenna using cavity and slot coupling techniques is presented in this paper. The bandwidth of the created mm-wave antenna is expanded by loading a circular patch over the C-shaped patch via a slot coupling, in which the circular patch is fed by slot coupling. The copper cavity-backed structure is utilized to provide stable directional radiation characteristics. The wideband mm-wave antenna is printed on RT/Duroid 5880 substrate, and the simulation results show that the mm-wave antenna can achieve a wide bandwidth of 46.2% (33.8-54.1GHz). The proposed mm-wave antenna has good directional radiation characteristics and small size, rendering it useful in many wireless communication systems.
关键词： cavity-backed structure,millimeter-wave antenna,directional radiation,slot coupling
更新于2025-09-19 17:13:59
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DESIGN OF 2D METAL PHOTONIC CRYSTAL ARRAY OF DIRECTIONAL RADIATION IN MICROWAVE BAND
摘要： A 2D metal photonic crystal structure with a rectangular lattice is designed for directed wave propagation in the microwave frequency band. The dispersion curve of EPC is computed for designing the directed period array. In order to favor the computing, the rectangular period array is studied, which is di?erent from the reference that is designed in optical range and uses the dielectric rods and hexagonal structure to compose the period array. The computed dispersion curves are combined with the theory of ?nite thick period array for obtaining the directed wave propagation structure. The in?uence of the number of metal rods on the antenna directionality is investigated, and the simulation results are compared and analyzed. It is found that when the number of transverse metal rods increases, the directionality of the antenna is enhanced, and the radiant power of the sidelobe radiation can be reduced. Based on the simulation results, the actual 2D metal photonic crystal array is constructed for the measurement validation. According to measurement results, the antenna located in the center of the array can get good directionality at 3.1 GHz.
关键词： 2D metal photonic crystal,antenna directionality,microwave band,directional radiation,dispersion curve
更新于2025-09-10 09:29:36
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A Low-Profile, Directional, Ultrawideband Antenna
摘要： A compact low pro?le, ultrawideband (UWB) antenna providing directional radiation pattern is proposed. The antenna is based on a modi?ed Vivaldi antenna, and is characterized by a three-dimensionally (3-D) bended structure. Each of the two radiation ?ns is capacitively loaded with an invert trapezoidal metallic plate at the end. In order to conveniently mount the antenna on the metal surface, a corrugated plate is added as a ground. Owing to the bended structure and capacitively loaded scheme, the antenna has a low pro?le of 0.216λm, where λm is the wavelength at the minimum operating frequency. The prototype of the antenna is fabricated and measured. The measured and simulated results show good agreement. The measured results show that the antenna has VSMR < 2.5 from 0.9 to 10 GHz and measured gain from 3.6 to 8.2 dBi.
关键词： low pro?le antenna,directional radiation,ultrawide-band (UWB) antenna,three-dimensionally (3-D) structure
更新于2025-09-04 15:30:14