Reconfigurable Mach–Zehnder interferometer for dynamic modulations of spoof surface plasmon polaritons
Reconfigurable Mach–Zehnder interferometer for dynamic modulations of spoof surface plasmon polaritons
复制标题
用于动态调制欺骗表面等离子体激元的可重构马赫曾德尔干涉仪
DOI:
10.1515/nanoph-2021-0539
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发表时间:
2021-01
期刊:
影响因子:
7.5
通讯作者:
Tie Jun Cui
中科院分区:
文献类型:
--
作者:
Wen Yi Cui;Jingjing Zhang;Xinxin Gao;Tie Jun Cui
Abstract. We propose an ultrathin reconfigurable Mach–Zehnder interferometer (MZI) for realizing dynamic frequency and amplitude modulations of spoof surface plasmon (SSP) signal. Active varactor diodes are integrated in the SSP unit cells on one of the MZI arms to introduce asymmetry to the MZI structure, which can control the interference patterns by varying bias voltages applied on the varactor diodes. We show that the spectral positions of multiple sharp interference dips are very sensitive to the change of diode capacitance, thereby allowing for good frequency modulation. We also demonstrate continuous amplitude modulation by tuning the varactor diodes at multiple selected frequencies. To verify the reconfigurable feature of the proposed SSP MZI, the frequency shift keying (FSK) and amplitude modulations have been experimentally demonstrated on the same structure. The modulation depth of the amplitude modulation can be further improved by designing geometrical parameters of the SSP structure, reaching a significant amplitude change from 0.88 to 0.05 in experiments.
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