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Simulation, Fabrication and Characterization of THz Metamaterial Absorbers

Simulation, Fabrication and Characterization of THz Metamaterial Absorbers

Published on: December 27, 2012

Electrodynamics analysis on coherent perfect absorber and phase-controlled optical switch.

Tianjie Chen¹, Shaoguang Duan, Y C Chen

¹Palm Springs International Garden, A-6262, Chongqing 401121, China.

Journal of the Optical Society of America. A, Optics, Image Science, and Vision

|May 8, 2012

Summary

Coherent perfect absorbers, designed as Fabry-Perot interferometers, completely eliminate incident light. This study uses classical electrodynamics to explain their operation, revealing key requirements for refractive indices and beam properties.

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Area of Science:

Optics and Photonics
Electromagnetism
Materials Science

Background:

Coherent perfect absorbers (CPAs) are devices that completely extinguish incident coherent light.
They are often conceptualized as specially designed Fabry-Perot interferometers.
Understanding their operational principles is crucial for advanced optical applications.

Purpose of the Study:

To analyze one- and two-beam coherent perfect absorbers using classical electrodynamics.
To provide a physically intuitive explanation for CPA operation based on index matching and wave superposition.
To explore potential functionalities of two-beam CPA devices, such as phase-controlled switching.

Main Methods:

Analysis of CPA operation via classical electrodynamics, focusing on index matching in layered structures.
Application of wave superposition principles to model light interaction within the interferometer.
Comparison of results with those obtained from S-matrix analysis.

Main Results:

Complete suppression of reflections is achieved through precise index matching in layered structures.
Optimal performance requires incident beams with specific phases and amplitudes.
A well-defined relationship must exist between the real and imaginary parts of the refractive indices.
The two-beam device demonstrates potential for functioning as a phase-controlled three-state switch.

Conclusions:

Classical electrodynamics provides a clear, intuitive framework for understanding coherent perfect absorbers.
The superposition of waves from multiple reflections adequately explains CPA operation without invoking time reversal.
The design principles elucidated are applicable to optimizing CPA performance and exploring novel functionalities.