Split ring aperture for optical magnetic field enhancement by radially polarized beam
Inspired by Babinet’s principle, we proposed a new plasmonic structure for enhancing the optical magnetic field, i.e. split ring aperture, whose complement is the well-known split ring. The split ring aperture exhibits a much better performance under radially polarized excitation than linearly p...
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| Main Authors: | , , |
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| Other Authors: | |
| Format: | Article |
| Language: | English |
| Published: |
2013
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| Subjects: | |
| Online Access: | https://hdl.handle.net/10356/96531 http://hdl.handle.net/10220/9917 |
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| Institution: | Nanyang Technological University |
| Language: | English |
| Summary: | Inspired by Babinet’s principle, we proposed a new plasmonic
structure for enhancing the optical magnetic field, i.e. split ring aperture,
whose complement is the well-known split ring. The split ring aperture
exhibits a much better performance under radially polarized excitation than
linearly polarized excitation. We attribute the ultra-high intensity
enhancement in magnetic field to the symmetric matching between the
aperture geometry and the direction of the electric field vector in each
direction of radially excitation. The impact of the design parameters on the
intensity enhancement and resonant wavelength is also investigated in
details. |
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