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Large lateral shift near pseudo-Brewster angle on reflection from a weakly absorbing double negative medium
Nian-Hai Shen1, Jing Chen, Qi-Yang Wu
1National Laboratory of Solid State Microstructures and Department of Physics, Nanjing University, Nanjing 210093, China.
Optics Express
|June 17, 2009
Summary
We found a large lateral shift for electromagnetic waves reflecting off a weakly absorbing double negative medium (DNM). This shift, near the pseudo-Brewster angle, can be positive or negative and is significantly influenced by DNM absorption.
Area of Science:
- Optics and Photonics
- Electromagnetism
- Materials Science
Background:
- Investigating electromagnetic wave reflection from novel materials is crucial for advanced optical applications.
- Double Negative Media (DNM) exhibit unique electromagnetic properties, including negative refractive indices.
- Understanding lateral shifts in reflection is key to controlling light propagation at interfaces.
Purpose of the Study:
- To analyze the lateral shift of electromagnetic waves reflected from a weakly absorbing double negative medium (DNM).
- To derive an analytical expression for the lateral shift and identify conditions for sign changes.
- To investigate the influence of weak absorption on the lateral shift phenomenon.
Main Methods:
- Developed an analytical expression for the lateral shift based on reflection theory.
- Utilized the momentum method for calculating the lateral shift.
- Performed finite-difference time-domain (FDTD) simulations to validate theoretical findings.
Main Results:
- Observed a large lateral shift near the pseudo-Brewster angle, which can be positive or negative.
- Derived an expression enabling easy determination of the critical transition point for the lateral shift's sign.
- Demonstrated that even weak absorption in the DNM significantly impacts the lateral shift magnitude and sign.
Conclusions:
- Theoretical analysis accurately predicts the lateral shift behavior of electromagnetic waves reflected from weakly absorbing DNMs.
- The derived analytical expression provides a reliable tool for understanding and controlling lateral shifts.
- Weak absorption in DNM is a critical factor influencing the lateral shift, necessitating its consideration in theoretical models and practical applications.
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