Electromagnetic modulating action in a microstrip cavity with embedded two detuned resonators

We present a novel approach for actively controlling electromagnetically induced transparency (EIT) analogs in a single-mode microstrip cavity. This cavity is side-coupled with a pair of varactor-loaded split-ring resonators (SRRs). The EIT-like effect is achieved through resonance hybridization bet...

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Published in:Journal of applied physics 2024-09, Vol.136 (10)
Main Authors: Jiang, Rui, Gao, Lei, Yang, Lei, He, Wenzhe, Wang, Jun, Wu, Qian, Sun, Yong, Wu, Quanying, Chen, Yongqiang
Format: Article
Language:English
Subjects:
Cavity resonators
Coupled modes
Electric potential
Group delay
Modulation
Varactor diodes
Voltage
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container_title Journal of applied physics
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Gao, Lei
Yang, Lei
He, Wenzhe
Wang, Jun
Wu, Qian
Sun, Yong
Wu, Quanying
Chen, Yongqiang
description We present a novel approach for actively controlling electromagnetically induced transparency (EIT) analogs in a single-mode microstrip cavity. This cavity is side-coupled with a pair of varactor-loaded split-ring resonators (SRRs). The EIT-like effect is achieved through resonance hybridization between the paired SRRs with frequency detuning. The microstrip cavity is utilized to enhance the EIT-like transmission properties, including Q-factor and group delay. Varactor diodes, soldered at the gap of the SRRs, are biased electrically through a DC voltage source. This dynamic modulation setup allows for the tuning of the enhanced EIT analog. Experimental results demonstrate that the enhanced EIT-like transmission spectrum can be tuned reversibly by 378 MHz with respect to the transmission dip frequency of 2.464 GHz under the bias voltage ranging from 0 to 5 V. Simultaneously, the controlled transmission spectrum enables a remarkable change in group delay of 10.9 ns. Moreover, the modulation amplitude of the composite SRRs-cavity structure reaches a peak value of up to 34.5 dB, significantly higher than the 6.4 dB of the individual SRRs pair. These results hold promise for inspiring innovation in actively controlled photonic devices for practical applications.
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source American Institute of Physics:Jisc Collections:Transitional Journals Agreement 2021-23 (Reading list)
subjects Cavity resonators
Coupled modes
Electric potential
Group delay
Modulation
Varactor diodes
Voltage
title Electromagnetic modulating action in a microstrip cavity with embedded two detuned resonators
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