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Space-Time-Modulated Reconfigurable Metamaterial Based on a Field-Focused Cavity for Nonreciprocal Transmission
Huu Nguyen Bui1, Ngoc Hung Phi1, Abdulrahman Alsaadi1
1School of Electronics and Information, Information and Communication System-on-Chip (SoC) Research Center, Kyung Hee University, 1732 Deogyeong-daero, Giheung, Yongin, Gyeonggi 17104, Republic of Korea.
ACS Applied Materials & Interfaces
|June 3, 2022
Summary
This study demonstrates nonreciprocal magneto-inductive wave (MIW) propagation control using space-time-modulated metamaterials. This approach enables dynamic, bias-free control of near-field waves, overcoming limitations of previous methods.
Area of Science:
- Metamaterials
- Wave Propagation
- Electromagnetics
Background:
- Lorentz reciprocity limits wave propagation control.
- Existing methods to break reciprocity require bulky, costly magnetic bias.
- Near-field wave control using metamaterials has significant applications but remains underexplored.
Purpose of the Study:
- To investigate the potential of space-time-modulated metamaterials for near-field wave propagation control.
- To demonstrate nonreciprocal magneto-inductive wave (MIW) propagation without magnetic bias.
- To explore dynamic control of near-field wave propagation.
Main Methods:
- Utilized space-time modulation in metamaterials to break Lorentz reciprocity.
- Designed a tunable unit cell to create a deep subwavelength cavity mode (∼λ/10³).
- Implemented spatial and temporal field modulation by breaking translational and capacitive symmetries, respectively.
Main Results:
- Achieved nonreciprocal MIW propagation control.
- Demonstrated reconfigurable waveguides through spatial modulation.
- Enabled direction-dependent transmission and frequency conversion via temporal modulation.
- Successfully controlled near-field wave propagation dynamically and nonreciprocally.
Conclusions:
- Space-time-modulated metamaterials offer a novel approach for bias-free, nonreciprocal near-field wave control.
- The proposed method allows for dynamic manipulation of wave propagation at subwavelength scales.
- This technology has potential applications in systems requiring advanced, dynamic, nonreciprocal near-field wave control.
