| FUNDAMENTAL AREAS OF PHENOMENOLOGY(INCLUDING APPLICATIONS) |
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Analysis of Optical Vortices in the Near Field of a Thin Metal Film |
| ZHANG Jin-Long1,2**
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1Key Laboratory of Advanced Microstructure Materials (Ministry of Education), Tongji University, Shanghai 200092
2Institute of Precision Optical Engineering, Department of Physics, Tongji University, Shanghai 200092
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| Cite this article: |
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ZHANG Jin-Long 2011 Chin. Phys. Lett. 28 054215 |
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Abstract Optical vortices are shown to be generated in the near-field of a slab lens with a realistic thin metal film due to the amplification of the evanescent wave by the metal film in the TM polarization. The vortices are connected to two saddle points near the output interface of the lens. By means of varying the position of the object with respect to the lens and the wavelength, the strength of circulation of the power flow, the position and the rotation of the vortices can be well controlled. The influence of the gain to the optical vortices is also illustrated.
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| Keywords:
42.25.Fx
42.25.Bs
78.20.Ci
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Received: 25 December 2010
Published: 26 April 2011
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| PACS: |
42.25.Fx
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(Diffraction and scattering)
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42.25.Bs
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(Wave propagation, transmission and absorption)
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78.20.Ci
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(Optical constants (including refractive index, complex dielectric constant, absorption, reflection and transmission coefficients, emissivity))
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