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Journal of the Optical Society of America B

Relative-cavity-length-controlled slow light in a cascaded magnon-photon system

Chao-Zhu Liu, Yunlong Deng, Miao Yin

Published Feb 20, 2020• 6 citations
Publisher

Abstract

We theoretically discuss the input–output characteristics of the cascaded magnon-photon system by focusing on the slow light effect caused by positive group delay. When two identical magnon-photon systems are cascaded, compared with the single cavity system, the bandwidth of the whole system is wider, but the group delay is smaller. The change of the group delay is different from that of the general linear system. Moreover, by changing the cavity length of the two microwave cavities, the system is slightly mismatched and the group delay could obviously increase. The slow light effect could be controlled by relative cavity length. The slow light effect of the mismatched double cavity system is more sensitive to external magnetic field than that of the single cavity system. The results provide a way to manipulate the transmission rate in optical information networks and a new view about the interconnection of microwave cavities.

DOI
10.1364/josab.390544

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We theoretically discuss the input–output characteristics of the cascaded magnon-photon system by focusing on the slow light effect caused by positive group delay. When two identical magnon-photon systems are cascaded, compared with the single cavity system, the bandwidth of the whole system is wider, but the group delay is smaller. The change of the group delay is different from that of the general linear system. Moreover, by changing the cavity length of the two microwave cavities, the system is slightly mismatched and the group delay could obviously increase. The slow light effect could be controlled by relative cavity length. The slow light effect of the mismatched double cavity system is more sensitive to external magnetic field than that of the single cavity system. The results provide a way to manipulate the transmission rate in optical information networks and a new view about the interconnection of microwave cavities.
We theoretically analyze the transmission characteristics of a magnon–photon coupling system with N cascaded microwave cavities. The influences of the magnon–photon coupling strength and cavity number on the transmission characteristics are the main focus of this research. With an increase in the cascaded cavity number, the slow light effect should be greatly enhanced. By changing the cavity lengths slightly in a staggered way, the group delay could be increased by an order of magnitude with a well guaranteed transmission amplitude. Group delay should be flexibly controlled because of the existence of magnon and the conversion of fast and slow light can be realized. Moreover, by properly adjusting the cavity length, we can control the frequency shifting of the output slow light and narrow the bandwidth of the output slow light, which can aid in the design of high-quality light-storage devices. We believe the results will have applications in the all-optical communications network.
Abstract We theoretically analyze the transmission characteristics of a magnon–photon coupling system based on ultrastrong optomechanical-like coupling via the cross-Kerr interaction. We use the definition of group delay to characterize the fast and slow light effects. It is found that the group delay of our system can be significantly improved by two to three orders of magnitude compared to previous studies in magnon–photon coupling systems, which means slow light effect can be significantly enhanced. By adjusting the driving power and frequency detuning of the microwave cavities, the magnitude and bandwidth of the group delay and transmittance can be adjusted precisely. Moreover, frequency control of slow light can be achieved by manipulating the strength of magnetic field. The influence of the cross-Kerr coupling strength of cavities on the system is also discussed in detail. The group delay of the system is close to milliseconds, while the transmittance is greatly improved. The result from this paper hopes to bring new development possibilities for the fabrication of optical memory and the construction of all-optical networks.
We theoretically propose a scheme to explore the magnetically and magnomechanically induced transparency phenomena in a cross-cavity magnomechanical system, focusing on the role of relative phase and the intensity of the two probing fields in enhancing the absorption and transmission spectra and manipulating the group delay of the transmitted light. Interestingly, the relative phase of the two probe fields could have overwhelming effects on both the absorption spectrum and the group delay of the output field. Tuning the relative phase and amplitude of the probe fields can suppress or enhance the absorption and transmission spectra. The combined effect of the magnon–photon and magnon–phonon couplings, along with relative phase modulations, helps to switch the probe field’s behavior from subluminal to superluminal in the current system. The current study offers a straightforward and practical approach in cavity magnomechanical systems, demonstrating the capability to employ the relative phase for the modulation of microwave signals within the cavity magnomechanical system, providing insights for the design of information transducers and quantum sensing.
Cavity magnomechanics (CMM) has rapidly become a new research field of cavity quantum electrodynamics for studying quantum information processing and sensing. Here, we theoretically study the magnomechanically induced transparency effect in a cavity magnomechanical system, focusing on the role of magnon squeezing in enhancing and controlling the group delay of the transmitted light. As a result, we find that the magnon number can be strongly affected by magnon squeezing, accompanied by a steerable transmission rate and controllable fast-to-slow light switching. In particular, in the photon-magnon strong-coupling scenario, the group delay of the probe field can be enhanced by about three times by using magnon squeezing compared to the case without magnon squeezing. Moreover, due to the presence of magnon squeezing, the efficiency of the second-order sideband in the photon-magnon weak-coupling scenario can also be enhanced compared to the case without magnon squeezing. These results provide tools to engineer CMM devices with magnon squeezing for, e.g., light propagation and storage, and precision measurements of weak signals.
The magnetostrictive effect provides an opportunity for exploring fundamental phenomena related to the phonon-magnon interaction. Here we show a tunable slow light in a cavity magnetomechanical system consisting of photon, magnon and phonon modes with a nonlinear phonon-magnon interaction, which originates from magnetostrictive forces. For a strong photon-magnon coupling strength, we can observe a transparency (absorption) window for the probe by placing a strong control field on the red (blue) detuned sideband of the hybridized modes, which are comprised of photons and magnons. In this work, we mainly show the characteristic changes in dispersion in the range of the transparency window. The value of group delay can be continuously adjusted by using different frequencies of magnon, which are determined by the external bias magnetic field and therefore can be conveniently tuned in a broad range. Both the intensity and the frequency of the control field have an influence on the transformation from subluminal to superluminal propagation and vice versa. Furthermore, one may achieve long-lived slow light (group delay of millisecond order) by enlarging the pump power. These results may find applications in information interconversion based on coherent coupling among photons, phonons and magnons.
Abstract We theoretically discuss the influence of a squeezed drive on the fast and slow light effect at different temperatures by focusing on two main factors: the nonlinear gain coefficient of optical parametric amplification and the phase of the pumping field. We show that the nonlinear gain coefficient and the phase of the pump field will affect the coupling strength between photon and magnon, which provides a way to achieve more obvious fast and slow light effects and good potential to realize the fast-slow light conversion. Moreover, by comparing two different temperatures, we find that the low temperature environment is more conducive to the production of fast light and slow light. With the addition of the squeezing drive field, the group delay of the system will get a larger value and the symmetry of the system will be destroyed, leading to asymmetric absorption. Our results provide more freedom for the realization and conversion of fast and slow light and is expected to find applications in optical communication and optical storage.