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An optical diode transmits forward 10Gbps data with less than 0.5dB power penalty, while suppressing and distorting backward data with a 11dB nominal power penalty. The nonreciprocal transmission is also demonstrated with a silicon modulator.
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http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5242188 | PMC |
http://dx.doi.org/10.1109/IPCon.2012.6358816 | DOI Listing |
Sci Rep
August 2025
National Creative Research Initiative Center for Spin Dynamics and Spin-Wave Devices, Nanospinics Laboratory, Department of Materials Science and Engineering, Seoul National University, Seoul, 08826, Republic of Korea.
Precise control of coupling strength, damping rate and nonreciprocity in photon-magnon systems is essential for advancing hybrid quantum technologies, including reconfigurable microwave components and quantum transducers. Here, we demonstrate magnetic field angle-dependent control of photon-magnon coupling and magnon dissipation in a cross-shaped microwave cavity supporting a spatially nonuniform radio-frequency (rf) magnetic field. By rotating the external magnetic field angle θ relative to the normal of the transmission line within the cavity plane, we simultaneously control the coherent coupling strength [Formula: see text], the ferromagnetic resonance (FMR) damping rate, and the system's nonreciprocal response.
View Article and Find Full Text PDFNat Commun
August 2025
International Joint Innovation Center, Zhejiang Key Laboratory of Intelligent Electromagnetic Control and Advanced Electronic Integration, Zhejiang University, Haining, China.
To address the burgeoning demand for computing capacity in artificial intelligence, researchers have explored optical neural networks that show advantages of ultrafast speed, low power consumption, ultra-high bandwidth, and high parallelism. However, most existing optical networks are reciprocal, where forward and backward propagation are intrinsically coupled. This results in the backward pathway remaining largely unexplored, hindering the realization of integrated perception-response systems.
View Article and Find Full Text PDFNon-reciprocal devices can be used to protect terahertz radiation sources and detectors from system echo reflection and noise interference. We propose an asymmetric groove silicon photonic crystal cylindrical metasurface, which generates high- quasi-bound states (q-BIC) and enhances nonlinearity. At terahertz wave incident intensity of 0.
View Article and Find Full Text PDFWe propose a scheme for a Figure-9 mode-locked fiber laser that utilizes liquid crystal variable retarders (LCs) with tunable splitting ratios and non-reciprocal phase shifts. Simulation results demonstrate that the parameter space can be effectively explored through full-wave scanning of the two LCs, while fast axes of both LCs are oriented at an angle of -1/4π to the horizontal plane. Under quasi-symmetric conditions, experimental results confirm the scheme's capability to control the mode-locking state.
View Article and Find Full Text PDFHere, we present an experimental demonstration of a true room-temperature magnetic-free non-reciprocity in a Doppler-broadened medium. By applying an additional pump field, the absorption of the forward probe field is significantly enhanced due to the canceling of the Doppler shifts; in contrast, the backward one is weakened due to the optical pumping process. In the experiment, we achieved a forward isolation of 11.
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