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Ideal and nonideal invisibility cloaks
Nina A Zharova1, Ilya V Shadrivov, Alexander A Zharov
1Nonlinear Physics Center, Research School of Physical Sciences and Engineering, Australian National University, Canberra, ACT 0200, Australia.
Optics Express
|December 24, 2008
Summary
This study analyzes electromagnetic fields within invisibility cloaks using analytical solutions. It examines nonideal cloak efficiency and the impact of scattering losses on cloaking performance.
Area of Science:
- Electromagnetism
- Metamaterials
- Optics
Background:
- Invisibility cloaks aim to render objects undetectable by manipulating electromagnetic fields.
- Understanding the precise field structure is crucial for designing effective cloaking devices.
- Nonideal conditions, such as scattering losses, can significantly degrade cloaking performance.
Purpose of the Study:
- To derive and analyze explicit expressions for electromagnetic field structures in invisibility cloaks.
- To investigate the efficiency of nonideal electromagnetic cloaks.
- To assess the influence of scattering losses on the overall invisibility achieved.
Main Methods:
- Employing analytical solutions for spatial transformation of electromagnetic fields.
- Deriving explicit mathematical expressions for field distributions.
- Analyzing the impact of scattering losses on cloak performance.
Main Results:
- Explicit expressions for electromagnetic field structures in cloaks were obtained.
- The efficiency of nonideal cloaks was analyzed.
- The detrimental effect of scattering losses on cloak invisibility was discussed.
Conclusions:
- Analytical solutions provide a powerful tool for understanding electromagnetic field behavior in cloaking devices.
- Scattering losses are a critical factor limiting the practical effectiveness of invisibility cloaks.
- The methodology can be extended to analyze other optical devices like beam splitters and field concentrators.
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