Nanofocusing by phase delayed plasmonic nanostructures illuminated with a linearly polarized light | Zendy

Song Wen-tao | Zendy; Feng Lin | Zendy; Zheyu Fang | Zendy; Xing Zhu | Zendy

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Nanofocusing by phase delayed plasmonic nanostructures illuminated with a linearly polarized light

Author(s) -

Song Wen-tao,

Feng Lin,

Zheyu Fang,

Xing Zhu

Publication year - 2010

Publication title -

acta physica sinica

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.199

H-Index - 47

ISSN - 1000-3290

DOI - 10.7498/aps.59.6921

Subject(s) - plasmon , optics , surface plasmon polariton , wavelength , ray , radius , surface plasmon , near field optics , materials science , nanostructure , phase (matter) , physics , plasmonic lens , optoelectronics , optical microscope , nanotechnology , scanning electron microscope , quantum mechanics , computer security , computer science

We report the near-field nanofocusing through two types of plasmonic nanostructures consisting of annular grooves and annular slit, respectively. The radius of one half of each circle is designed to be bigger than the other half by half wavelength of the surface plasmon polaritons. By illuminating the structures with linearly polarized light, one single tight focal spot was detected by the scanning near-field optical microscope. Compared with the method of using radially polarized light, this method does not need to keep the center of the illuminating light right on the center of the structure, hence is much easier to use. Furthermore, theoretical simulations based on the finite-difference time-domain method testified the experimental results.

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