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Homogeneous and isotropic bends to tunnel waves through multiple different/equal waveguides along arbitrary
Tiancheng Han1, Cheng-Wei Qiu, Jian-Wen Dong
1Department of Electrical and Computer Engineering, National University of Singapore, Singapore, Singapore.
Optics Express
|July 13, 2011
Summary
This study introduces a new optical method for creating compact, homogeneous, and isotropic waveguide bends. These bends can guide electromagnetic waves in any direction without distortion, simplifying fabrication and application.
Area of Science:
- Photonics and Waveguide Technology
- Electromagnetics and Optics
Background:
- Designing optical waveguide bends with arbitrary directional control and maintaining wave integrity is challenging.
- Existing methods often result in complex structures or material requirements.
Purpose of the Study:
- To develop a novel optical transformation for designing homogeneous, isotropic waveguide bends.
- To enable ideal wave tunneling along any direction through multiple waveguides of varying cross-sections.
Main Methods:
- Derivation of general expressions for homogeneous and anisotropic parameters in bend regions.
- Replacement of anisotropic materials with two types of easily arranged isotropic materials in a planarly stratified configuration.
- Construction of an arbitrary bender using homogeneous and isotropic materials with flat boundaries.
Main Results:
- Successful design of nonmagnetic, isotropic, and homogeneous bends capable of bending waves in arbitrary directions.
- Demonstration of perfect wave tunneling without mode distortion in compact bender designs.
- Validation of functionalities through numerical results, confirming ease of fabrication and application.
Conclusions:
- The proposed optical transformation provides a versatile method for creating efficient and compact waveguide bends.
- The use of homogeneous and isotropic materials simplifies fabrication and broadens application possibilities.
- This approach offers a significant advancement in controlling electromagnetic wave propagation through complex waveguide structures.
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