| CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES |
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Focal Shift of Paraxial Gaussian Beams in a Left-Handed Material Slab Lens |
ZHANG Kang-Kang, LUO Hai-Lu, WEN Shuang-Chun |
| Key Laboratory for Micro/Nano Opto-Electronic Devices of Ministy of Education, School of Computer and Communication, Hunan University, Changsha 410082 |
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| Cite this article: |
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ZHANG Kang-Kang, LUO Hai-Lu, WEN Shuang-Chun 2010 Chin. Phys. Lett. 27 077801 |
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Abstract Focal shift is inevitable in conventional lens systems due to the Fresnel number and angular aperture. In this Letter, we demonstrate that there is no focal shift when a paraxial Gaussian beam passes through a left-handed material slab lens without absorption or gain. However, the effect is exhibited in the presence of absorption or gain, and becomes larger as the absorption or gain increases. When the absorption is equal to the gain, the phenomenon of the focal shift caused by the gain is more obvious. In addition, the field distribution is not affected by the absorption or gain and always remains Gaussian both in internal and external focus planes.
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| Keywords:
78.20.Ci
41.20.Jb
42.25.Fx
42.79.Bh
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Received: 29 December 2009
Published: 28 June 2010
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| PACS: |
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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41.20.Jb
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(Electromagnetic wave propagation; radiowave propagation)
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42.25.Fx
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(Diffraction and scattering)
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42.79.Bh
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(Lenses, prisms and mirrors)
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