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Search Results (3)

Search Parameters:
Keywords = magnet-free nonreciprocal device

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10 pages, 673 KiB  
Article
Optical Nonreciprocity Based on the Four-Wave Mixing Effect in Semiconductor Quantum Dots
by Zelin Lin, Han Yang, Fei Xu, Yihong Qi, Yueping Niu and Shangqing Gong
Nanomaterials 2025, 15(5), 380; https://doi.org/10.3390/nano15050380 - 1 Mar 2025
Viewed by 722
Abstract
Optical nonreciprocity and nonreciprocal devices such as optical diodes have broad and promising applications in various fields, ranging from optical communication to signal process. Here, we propose a magnet-free nonreciprocal scheme based on the four-wave mixing (FWM) effect in semiconductor quantum dots (SQDs). [...] Read more.
Optical nonreciprocity and nonreciprocal devices such as optical diodes have broad and promising applications in various fields, ranging from optical communication to signal process. Here, we propose a magnet-free nonreciprocal scheme based on the four-wave mixing (FWM) effect in semiconductor quantum dots (SQDs). Via controlling the directions of the coupling fields, the probe field can achieve high transmission in the forward direction within a certain frequency range due to the FWM effect. And the transmission of the probe field in the backward direction undergoes significant reduction, as the FWM effect is absent. The calculation results show a wide nonreciprocal transmission window with isolation greater than 12 dB and insertion loss lower than 0.08 dB. The influences of the Rabi frequencies of the coupling fields, the medium length, and the decay rates on the nonreciprocal propagation of the probe field are also studied, showing the requirements of these parameters for good nonreciprocal performances. Our work may offer an insight for developing optical nonreciprocal devices based on the FWM process and the SQD system. Full article
(This article belongs to the Special Issue Nanophotonics and Plasmonics)
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14 pages, 3065 KiB  
Article
Loss Mitigation in Self-Biased Microstrip Circulators
by Lingqi Kong, Alexander Schuchinsky, Sumin Joseph, Taylan Eker and Yi Huang
Magnetism 2023, 3(2), 121-134; https://doi.org/10.3390/magnetism3020010 - 4 May 2023
Cited by 1 | Viewed by 2840
Abstract
Integration of the ferrite devices in the RF front-end and active antennas is hindered by the need for external magnets, biasing soft microwave ferrites. The hexaferrite-based self-biased nonreciprocal devices can operate without external magnets at mm-wave frequencies but the currently available hexaferrite materials [...] Read more.
Integration of the ferrite devices in the RF front-end and active antennas is hindered by the need for external magnets, biasing soft microwave ferrites. The hexaferrite-based self-biased nonreciprocal devices can operate without external magnets at mm-wave frequencies but the currently available hexaferrite materials inflict high RF losses at lower frequencies, particularly in the wireless communication bands. In this paper, the parameters of La-Co-substituted hexaferrite compounds are used for the self-biased circulators in the low GHz frequency bands, and a means of the dissipation loss reduction are discussed. Full article
(This article belongs to the Special Issue Mathematical Modelling and Physical Applications of Magnetic Systems)
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12 pages, 4471 KiB  
Article
Magnetic-Free Nonreciprocal Multifunction Device Based on Switched Delay Lines
by Fengchuan Wu, Yuejun Zheng and Yunqi Fu
Electronics 2019, 8(8), 862; https://doi.org/10.3390/electronics8080862 - 3 Aug 2019
Viewed by 2922
Abstract
A magnetic-free multifunction nonreciprocal device based on switched delay lines (SDLs) has been proposed in this paper. It is constructed with two double balanced gyrators (DBGs) and four baluns, each pair of differential ports of the balun connect the ports at the same [...] Read more.
A magnetic-free multifunction nonreciprocal device based on switched delay lines (SDLs) has been proposed in this paper. It is constructed with two double balanced gyrators (DBGs) and four baluns, each pair of differential ports of the balun connect the ports at the same orientation of the two DBGs, respectively. Due to the asymmetry of the clock control signals acting on the switches, the time reversal symmetry of the transmission line between the Gilbert quad-switch-sets (GQSS) can be broken to achieve non-reciprocity. It can be used as a circulator, gyrator, or isolator by setting different control signals. The device has infinite working bandwidth in theory based on the SDLs. Common mode interference can be better suppressed by using differential transmission structures. Moreover, power capacity can be improved compared to the previous work. Then, experiments have been done to verify the device as a circulator. Broadband property and the anti-interference property have been verified. Full article
(This article belongs to the Section Microwave and Wireless Communications)
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