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Tunable asymmetric Mach-Zehnder interferometer based on spoof surface plasmon polaritons
Optics Express
|April 12, 2025
Summary
This study introduces an ultrathin asymmetric Mach-Zehnder interferometer (MZI) using spoof surface plasmon polaritons (SSPPs). By integrating varactor diodes, the device enables voltage-controlled manipulation of interference valleys for tunable signal transmission.
Area of Science:
- Electromagnetics and Photonics
- Metamaterials and Plasmonics
Background:
- Spoof surface plasmon polaritons (SSPPs) enable subwavelength waveguiding at lower frequencies.
- Mach-Zehnder interferometers (MZIs) are fundamental photonic devices for signal manipulation.
Purpose of the Study:
- To propose and demonstrate an ultrathin asymmetric Mach-Zehnder interferometer (MZI) based on spoof surface plasmon polaritons (SSPPs).
- To achieve voltage-controlled tunability of interference characteristics in the SSPPs MZI using varactor diodes.
Main Methods:
- Design of an asymmetric MZI structure supporting SSPPs.
- Integration of varactor diodes into one arm of the MZI for electrical tuning.
- Simulation and experimental measurement of transmission spectra and phase modulation.
Main Results:
- Demonstrated voltage-induced redshift of interference valleys in the 5-8 GHz band.
- Achieved switching from off-state to on-state transmission by altering varactor bias.
- Observed a phase modulation range of 43° with capacitance variation.
- Experimental results showed good agreement with simulations, confirming device functionality.
Conclusions:
- The proposed SSPPs MZI exhibits reconfigurable characteristics through voltage control.
- The device offers a promising platform for tunable microwave and terahertz signal processing applications.
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