Manipulating surface plasmon waves by transformation optics：Design examples of a beam squeezer,bend,and omnidirectional absorber

• Published in: Chinese physics B Vol. 22; no. 3; pp. 305 - 311
• Main Author: 余振中 冯一军 王正斌 赵俊明 姜田
• Format: Journal Article
• Language: English
• Published: 01.03.2013
• Subjects: Approximation; Beams (radiation); Devices; Dielectrics; Mathematical analysis; Plasmonics; Plasmons; Three dimensional; Transformations; 变换光学; 吸收剂; 平面弯曲; 操作; 榨汁机; 表面等离子体波; 表面等离子体激元; 设计实例
• ISSN: 1674-1056; 2058-3834; 1741-4199
• DOI: 10.1088/1674-1056/22/3/034102

We present several design examples of how to apply transformation optics and curved space under coordinate transformation to manipulating the surface plasmon waves in a controlled manner.We demonstrate in detail the design procedure of the plasmonic wave squeezer,in-plane bend and omnidirectional absorber.We show that the approximation method of modifying only the dielectric material of a dielectric-metal surface of the plasmonic device could lead to acceptable performance,which facilitates the fabrication of the device.The functionality of the proposed plasmonic device is verified using three-dimensional full-wave electromagnetic simulations.Aiming at practical realization,we also show the design of a plasmonic in-plane bend and omnidirectional absorber by an alternative transformation scheme,which results in a simple device structure with a tapered isotropic dielectric cladding layer on the top of the metal surface that can be fabricated with existing nanotechnology.