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Poynting vector analysis of a superlens.
Ming-Chuan Yang1, Kevin J Webb
1School of Electrical and Computer Engineering, Purdue University, 465 Northwestern Avenue, West Lafayette, Indiana 47907-2035, USA.
Optics Letters
|October 4, 2005
Summary
This study analyzes lossy negative refractive index (NRI) or left-handed slab lenses. It reveals image plane vortices due to evanescent spectrum field growth, even with minor loss or gain.
Area of Science:
- Electromagnetics and Optics
- Metamaterials Research
Background:
- Negative refractive index (NRI) materials, also known as left-handed materials, offer unique electromagnetic properties.
- Understanding the behavior of these materials, particularly when incorporating losses, is crucial for practical applications.
Purpose of the Study:
- To conduct a power analysis of a lossy negative refractive index (NRI) or left-handed slab lens.
- To investigate the formation and characteristics of image plane phenomena in such lenses.
Main Methods:
- Theoretical power analysis of electromagnetic wave propagation through a slab lens with a negative refractive index.
- Examination of the influence of loss or gain on the evanescent spectrum and image formation.
Main Results:
- The analysis reveals the presence of vortices in the image plane of the lossy NRI slab lens.
- These vortices are observed even with small amounts of loss or gain.
- The formation of these vortices is attributed to the field growth within the evanescent spectrum.
Conclusions:
- Lossy negative refractive index slab lenses exhibit complex image plane behavior, including vortex formation.
- Evanescent wave dynamics play a significant role in the imaging properties of these metamaterials.
- Further research into loss management is essential for optimizing NRI lens performance.