Optical phase front control in a metallic grating with equally spaced alternately tapered slits

doi:10.1088/1674-1056/22/10/104212

中国物理B ›› 2013, Vol. 22 ›› Issue (10): 104212-104212.doi: 10.1088/1674-1056/22/10/104212

• ELECTROMAGNETISM, OPTICS, ACOUSTICS, HEAT TRANSFER, CLASSICAL MECHANICS, AND FLUID DYNAMICS • 上一篇下一篇

Optical phase front control in a metallic grating with equally spaced alternately tapered slits

郑改革, 吴义根, 徐林华

School of Physics and Optoelectronic Engineering, Nanjing University of Information Science & Technology, Nanjing 210044, China

收稿日期:2012-12-10 修回日期:2013-03-04 出版日期:2013-08-30 发布日期:2013-08-30
基金资助:
Project supported by the National Natural Science Foundation of China (Grant Nos. 61203211 and 20907021) and the Foundation for Outstanding Young Teachers of Nanjing University of Information Science & Technology, China (Grant No. 20110423).

Optical phase front control in a metallic grating with equally spaced alternately tapered slits

Zheng Gai-Ge (郑改革), Wu Yi-Gen (吴义根), Xu Lin-Hua (徐林华)

School of Physics and Optoelectronic Engineering, Nanjing University of Information Science & Technology, Nanjing 210044, China

Received:2012-12-10 Revised:2013-03-04 Online:2013-08-30 Published:2013-08-30
Contact: Zheng Gai-Ge E-mail:eriot@126.com
Supported by:
Project supported by the National Natural Science Foundation of China (Grant Nos. 61203211 and 20907021) and the Foundation for Outstanding Young Teachers of Nanjing University of Information Science & Technology, China (Grant No. 20110423).

摘要/Abstract

摘要： A technique capable of focusing and bending electromagnetic (EM) waves through plasmonic gratings with equally spaced alternately tapered slits has been introduced. Phase resonances are observed in the optical response of transmission gratings, and the EM wave passes through the tuning slits in the form of surface plasmon polaritons (SPPs) and obtains the required phase retardation to focus at the focal plane. The bending effect is achieved by constructing an asymmetric phase front which results from the tapered slits and gradient refractive index (GRIN) distribution of the dielectric material. Rigorous electromagnetic analysis by using the two-dimensional (2D) finite difference time domain (FDTD) method is employed to verify our proposed designs. When the EM waves are incident at an angle on the optical axis, the beam splitting effect can also be achieved. These index-modulated slits are demonstrated to have unique advantages in beam manipulation compared with the width-modulated ones. In combination with previous studies, it is expected that our results could lead to the realization of optimum designs for plasmonic nanolenses.

关键词: surface plasmon polaritons, optical phase front control, metallic grating, nanophotonic device

Abstract: A technique capable of focusing and bending electromagnetic (EM) waves through plasmonic gratings with equally spaced alternately tapered slits has been introduced. Phase resonances are observed in the optical response of transmission gratings, and the EM wave passes through the tuning slits in the form of surface plasmon polaritons (SPPs) and obtains the required phase retardation to focus at the focal plane. The bending effect is achieved by constructing an asymmetric phase front which results from the tapered slits and gradient refractive index (GRIN) distribution of the dielectric material. Rigorous electromagnetic analysis by using the two-dimensional (2D) finite difference time domain (FDTD) method is employed to verify our proposed designs. When the EM waves are incident at an angle on the optical axis, the beam splitting effect can also be achieved. These index-modulated slits are demonstrated to have unique advantages in beam manipulation compared with the width-modulated ones. In combination with previous studies, it is expected that our results could lead to the realization of optimum designs for plasmonic nanolenses.

Key words: surface plasmon polaritons, optical phase front control, metallic grating, nanophotonic device

中图分类号: (Reflectors, beam splitters, and deflectors)

42.79.Fm

42.25.-p (Wave optics) 42.79.Ry (Gradient-index (GRIN) devices)

郑改革, 吴义根, 徐林华. Optical phase front control in a metallic grating with equally spaced alternately tapered slits[J]. 中国物理B, 2013, 22(10): 104212-104212.

Zheng Gai-Ge (郑改革), Wu Yi-Gen (吴义根), Xu Lin-Hua (徐林华). Optical phase front control in a metallic grating with equally spaced alternately tapered slits[J]. Chin. Phys. B, 2013, 22(10): 104212-104212.

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Optical phase front control in a metallic grating with equally spaced alternately tapered slits

Optical phase front control in a metallic grating with equally spaced alternately tapered slits

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