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Plasmonics

, Volume 5, Issue 4, pp 405–409 | Cite as

A Design Method for a Micron-Focusing Plasmonic Lens Based on Phase Modulation

  • Fenghuan HaoEmail author
  • Rui Wang
  • Jia Wang
Article

Abstract

A design method of a micron-focusing plasmonic lens is proposed, which consists of a nanoaperture surrounded by concentric annular grooves with fixed width and depth. The phase modulation of the radiation lights decoupled from surface plasmon polariton waves by the annular grooves is realized by altering the radii of the grooves. Based on the principle of the constructive interference, a design formula of a micron-focusing plasmonic lens is deduced. The transmitted fields through the designed plasmonic lenses are numerically simulated with finite-difference time-domain method, and the results show that a circular focusing spot is generated where the focal length can be controlled in several micrometers, which agree with our theoretical analysis.

Keywords

Surface plasmon polaritons Subwavelength aperture Scattering light Focusing 

Notes

Acknowledgments

This work is supported by the National Natural Science Foundation of China under Grant 60678028. The authors are grateful to Qingyan Wang at Peking University for theoretical discussions.

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Copyright information

© Springer Science+Business Media, LLC 2010

Authors and Affiliations

  1. 1.Department of PhysicsTsinghua UniversityBeijingPeople’s Republic of China
  2. 2.State Key Laboratory of Precision Measurement Technology and Instruments, Department of Precision InstrumentsTsinghua UniversityBeijingPeople’s Republic of China

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