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Updated: Jun 13, 2026

Fabrication And Characterization Of Photonic Crystal Slow Light Waveguides And Cavities
Published on: November 30, 2012
Polarization dependence and independence of near-field enhancement through a subwavelength circle hole
Zu-Bin Li1, Wen-Yuan Zhou, Xiang-Tian Kong
1The Key Laboratory of Weak Light Nonlinear Photonics, Ministry of Education, Teda Applied Physics School, Nankai University, Tianjin 300457, China .
Abstract:
By setting a metal rod or tooth-type structures in a single subwavelength hole, its near-field can be strongly enhanced. The near-field enhancement has strong polarization dependence when the structure in hole is twofold symmetric. Only the polarization along the longitudinal side of the metal rod or tooth-type structure can lead to strongest enhancement, which is attributed to the resonance of the localized surface plasmon. However, if the structure in hole is fourfold symmetric, the near-field enhancement is free from the polarization.
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