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Design and Characterization Methodology for Efficient Wide Range Tunable MEMS Filters

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Tunable thermal wave nonreciprocity by spatiotemporal modulation.

Liujun Xu¹, Jiping Huang¹, Xiaoping Ouyang²

¹Department of Physics, State Key Laboratory of Surface Physics, and Key Laboratory of Micro and Nano Photonic Structures (MOE), Fudan University, Shanghai 200438, China.

Physical Review. E

|April 17, 2021

Summary

Researchers achieved one-way thermal wave propagation using spatiotemporal modulation. This breakthrough enables tunable thermal nonreciprocity, crucial for advanced thermal devices.

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Area of Science:

Thermodynamics
Wave phenomena
Metamaterials

Background:

Nonreciprocity enables one-way propagation, vital in various scientific fields.
Achieving one-way propagation for thermal waves is a significant challenge due to lacking mechanisms.

Purpose of the Study:

To introduce spatiotemporal modulation for realizing thermal wave nonreciprocity.
To analytically investigate the role of phase difference in controlling thermal nonreciprocity.

Main Methods:

Introducing spatiotemporal modulation to thermal wave dynamics.
Considering both convective and Willis terms for transient thermal waves.
Analytical study of phase difference and definition of a rectification ratio.
Finite-element simulations for validation.

Main Results:

Demonstrated thermal wave nonreciprocity through spatiotemporal modulation.
Identified phase difference as a tunable parameter for controlling nonreciprocity.
Established conditions for nonreciprocity based on a defined rectification ratio.
Validated theoretical predictions with simulations.

Conclusions:

Spatiotemporal modulation is a viable mechanism for achieving thermal wave nonreciprocity.
The developed framework offers control over thermal wave propagation.
Potential applications include simultaneous thermal detection and stabilization.