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Keywords = wedge plasmon polariton waveguide

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12 pages, 2046 KiB  
Communication
Tunable Characteristics of Wedge Plasmonic Waveguide with Thin Metallic Layers
by Ha Trinh Thi, Duong Nguyen Van, Hieu Dang Van and Hoang Manh Chu
Photonics 2024, 11(9), 842; https://doi.org/10.3390/photonics11090842 - 5 Sep 2024
Viewed by 1407
Abstract
In this study, we propose a mechanism for tuning the modal characteristics of a wedge plasmonic waveguide. The wedge plasmonic waveguide is composed of a thin metallic layer deposited on a wedge-shaped dielectric waveguide. The tuning mechanism is based on controlling the surface [...] Read more.
In this study, we propose a mechanism for tuning the modal characteristics of a wedge plasmonic waveguide. The wedge plasmonic waveguide is composed of a thin metallic layer deposited on a wedge-shaped dielectric waveguide. The tuning mechanism is based on controlling the surface plasmon polariton (SPP) mode at the interface between the metal layer and the dielectric waveguide instead of controlling the SPP mode at the interface between the wedge-shaped metal layer and the surrounding media. This mechanism is performed by modulating the effective refractive index of the dielectric waveguide using a closely coupled tuning waveguide. The numerically investigated results show that the propagation length of the device can be tuned more than 100%; this characteristic has not been explored yet in previous studies. The effective mode area with deep-subwavelength size is almost kept constant while tuning the propagation length. This study offers new insights into tailoring the modal characteristics of plasmonic waveguides based on controlling the mode property at the interface between the metal layer and the dielectric waveguide. This study is also a guideline for developing active plasmonic devices such as tunable nanoscale lightwave guiding waveguides and THz optic modulators. Full article
(This article belongs to the Section Optoelectronics and Optical Materials)
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11 pages, 3455 KiB  
Article
Wedge Surface Plasmon Polariton Waveguides Based on Wet-Bulk Micromachining
by Nguyen Thanh Huong, Nguyen Van Chinh and Chu Manh Hoang
Photonics 2019, 6(1), 21; https://doi.org/10.3390/photonics6010021 - 27 Feb 2019
Cited by 14 | Viewed by 4779
Abstract
In this paper, we propose and investigate the modal characteristics of wedge surface plasmon polariton (SPP) waveguides for guiding surface plasmon waves. The wedge SPP waveguides are composed of a silver layer deposited onto the surface of a wedge-shaped silicon dielectric waveguide. The [...] Read more.
In this paper, we propose and investigate the modal characteristics of wedge surface plasmon polariton (SPP) waveguides for guiding surface plasmon waves. The wedge SPP waveguides are composed of a silver layer deposited onto the surface of a wedge-shaped silicon dielectric waveguide. The wedge-shaped silicon dielectric waveguides are explored from the anisotropic wet etching property of single crystal silicon. The wedge SPP waveguides are embedded in a dielectric medium to form the metal–dielectric interface for guiding the surface plasmon waves. The propagation characteristics of the wedge SPP waveguides at the optical telecommunication wavelength of 1.55 μm are evaluated by a numerical simulation. The influence of the physical parameters such as the dimensions of the wedge SPP waveguide and the refractive index of the dielectric medium on the propagation of the surface plasmon wave is investigated. In addition, by comparing the propagation characteristics, we derive the wedge SPP waveguide with the optimal performance. Full article
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