Study of photon–magnon coupling in a YIG-film split-ring resonant system

Bhoi, Biswanath; Cliff, Tom; Maksymov, Ivan S.; Kostylev, Mikhail; Aiyar, R. P. R. C.; Venkataramani, N.; Prasad, Shiva; Stamps, R. L.

doi:10.1063/1.4904857

Cited by 110 publications

(138 citation statements)

References 52 publications

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“…Here, we report on the up-conversion of the strong coupling of photons in a micropatterned microwave splitring resonator 12,13 (SRR) and a YIG film to optical frequencies. In particular, we use Brillouin light scattera) Electronic mail: stefan.klingler@wmi.badw.de ing (BLS) spectroscopy and microwave absorption (MA) measurements to simultaneously probe both magnonic and photonic excitations in a coupled SRR/YIG film system, which is a first step towards wavelength upconversion.…”

Section: 11mentioning

confidence: 99%

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Combined Brillouin light scattering and microwave absorption study of magnon-photon coupling in a split-ring resonator/YIG film system

Klingler

Maier-Flaig

Gross

et al. 2016

Applied Physics Letters

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Microfocused Brillouin light scattering (BLS) and microwave absorption (MA) are used to study magnonphoton coupling in a system consisting of a split-ring microwave resonator and a yttrium iron garnet (YIG) film. The split-ring resonantor is defined by optical lithography and loaded with a 1 µm-thick YIG film grown by liquid phase epitaxy. BLS and MA spectra of the hybrid system are simultaneously recorded as a function of the applied magnetic field magnitude and microwave excitation frequency. Strong coupling of the magnon and photon modes is found with a coupling strength of g eff /2π = 63 MHz. The combined BLS and MA data allows to study the continuous transition of the hybridized modes from a purely magnonic to a purely photonic mode by varying the applied magnetic field and microwave frequency. Furthermore, the BLS data represent an up-conversion of the microwave frequency coupling to optical frequencies.The interaction between light and magnetic matter is of long-standing and fundamental interest. In recent years, the coupling of elementary excitations of the light field (photons) to those of the spin system (magnons) regained interest due to potential applications in quantum information processing.1-3 For example, hybrid quantum system are discussed as potential candidates for the upand down-conversion of quantum signals from the optical to the microwave domain and vice versa. One way of interfacing the microwave regime is to magnetically dipole couple the spin ensemble to a microwave resonator. 4-8The prerequisite for information transfer on the quantum level is to realize a large coupling strength exceeding the loss rates of the subsytems, 4,7,9 here, the microwave resonator and the spin ensemble. Since the coupling rate is proportional to the square root of the number of participating spins 4,10 ferromagnets with a high spin density are ideal for the creation of strongly coupled, hybridized magnon-photon modes. 10,11Recently, magnon-photon coupling has been investigated in several experiments where a microwave cavity was loaded with yttrium iron garnet (YIG) and the microwave transmission and/or reflection was measured as a function of the applied magnetic field.4-7 Furthermore, spin pumping in combination with the dc inverse spin Hall effect has been employed as a detection scheme for sensing the magnonic part of magnon-photon polaritons in magnetic thin film heterostructures, 6,8 which is effectively a down-conversion of the coupling to dc.Here, we report on the up-conversion of the strong coupling of photons in a micropatterned microwave splitring resonator 12,13 (SRR) and a YIG film to optical frequencies. In particular, we use Brillouin light scattera) Electronic mail: stefan.klingler@wmi.badw.de ing (BLS) spectroscopy and microwave absorption (MA) measurements to simultaneously probe both magnonic and photonic excitations in a coupled SRR/YIG film system, which is a first step towards wavelength upconversion. We observe a clear mode anti-crossing indicating a hybridization of the magnon and micro...

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Section: 11mentioning

confidence: 99%

“…It consists of a 50 Ω impedance matched feedline with a width of w = 1.4 mm inductively coupled to the SRR. 12,13 The square SRR has an outer edge length of a = 6.5 mm while the inner edge length is b = 3.5 mm. The gap width and distance to the feedline are both g = 0.2 mm.…”

Section: 11mentioning

confidence: 99%

Combined Brillouin light scattering and microwave absorption study of magnon-photon coupling in a split-ring resonator/YIG film system

Klingler

Maier-Flaig

Gross

et al. 2016

Applied Physics Letters

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“…In light of this principle, a cavity magnon polariton (CMP) has been recently studied in a coupled magnon-cavity photon system 2 , where the general feature of the CMP is described in a concise classical model 2 which accurately highlights the key physics of phase correlation between the cavity and magetization resonances. This general CMP model can be used to quantitatively analyze the characteristic features of magnon-photon coupling experiments recently performed by many different groups [2][3][4][5][6][7][8][9][10] , in which a low damping bulk ferromagnetic insulator is set either on-top of a superconducting co-plannar waveguide or inside a high quality 3D microwave cavity.…”

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confidence: 99%

On-chip artificial magnon-polariton device for voltage control of electromagnetically induced transparency

Kaur¹,

Yao²,

Gui³

et al. 2016

J. Phys. D: Appl. Phys.

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We demonstrate an on-chip device utilizing the concept of artificial cavity magnon-polariton (CMP) coupling between the microwave cavity mode and the dynamics of the artificial magnetism in a split ring resonator. This on-chip device allows the easy tuning of the artificial CMP gap by using a DC voltage signal, which enables tuneable electrodynamically induced transparency. The high tunability of the artificial magnon-polariton system not only enables the study of the characteristic phenomena associated with distinct coupling regimes, but also may open up avenues for designing novel microwave devices and ultra-sensitive sensors.When an electromagnetic wave propagates in a magnetic material, its magnetic fields can drive the magnetization precession and the mutual coupling between the macroscopic electrodynamic and magnetization dynamic results in a hybrid electromagnetic mode of media, i.e., magnon polariton 1 . In light of this principle, a cavity magnon polariton (CMP) has been recently studied in a coupled magnon-cavity photon system 2 , where the general feature of the CMP is described in a concise classical model 2 which accurately highlights the key physics of phase correlation between the cavity and magetization resonances. This general CMP model can be used to quantitatively analyze the characteristic features of magnon-photon coupling experiments recently performed by many different groups 2-10 , in which a low damping bulk ferromagnetic insulator is set either on-top of a superconducting co-plannar waveguide or inside a high quality 3D microwave cavity.The intriguing physics of CMP opens up new avenues for materials characterization and microwave applications. For example, CMP effect has recently been observed by setting miligrams of magnetic nano-particles inside a special circular waveguide cavity 11 , where the CMP coupling can be analyzed in the simple 1D configuration by using either the straightforward transfer matrix method 11 , or equivalently, the 1D scattering theory 12 . It is found that the CMP coupling enables quantifying the complex permeability of magnetic nanoparticles with high sensitivity, which was an outstanding challenge for the biomedical applications of magnetic nanoparticles 11 . In 3D microwave cavities, it is shown that the CMP coupling leads to the electromagnetically induced transparency (EIT), which is tuneable by applying an external magnetic field 5 . Such a tuneable EIT is of great importance for designing microwave circuits.From the perspective of device application the external magnetic field used to alter the resonance frequency of the magnon, and the size of the 3D cavity are not favourable. Inspired by the study of artificial magnetism 13,14 , where the non-magnetic conducting material is designed to provide a magnetic response at microwave frequencies, in this paper, we report on a 2D artificial CMP system created by integrating an artificial magnetic resonator with an on-chip cavity resonator. Here the cavity mode and the artificial magnon mode are generated by a ...

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“…Recently, strong coupling between a microwave cavity mode and ferromagnetic resonance (FMR) has been realized at room temperature [6][7][8][9][10][11][12][13][14][15][16][17] . Exchange interactions lock the high density of spins in YIG into a macro-spin state, leading to strong coupling with a cavity mode which can be adjusted using an external magnetic field.…”

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confidence: 99%

Indirect coupling between two cavity modes via ferromagnetic resonance

Hyde

Bai

Harder

et al. 2016

Applied Physics Letters

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We experimentally realize indirect coupling between two cavity modes via strong coupling with the ferromagnetic resonance in Yttrium Iron Garnet (YIG). We find that some indirectly coupled modes of our system can have a higher microwave transmission than the individual uncoupled modes. Using a coupled harmonic oscillator model, the influence of the oscillation phase difference between the two cavity modes on the nature of the indirect coupling is revealed. These indirectly coupled microwave modes can be controlled using an external magnetic field or by tuning the cavity height. This work has potential for use in controllable optical devices and information processing technologies.The indirect coupling of cavity modes via a waveguide has been studied theoretically and experimentally for use in optical information processing 1 . This indirect coupling dramatically modifies the transmission spectra, and is widely used for optical filtering, buffering, switching, and sensing in photonic crystal structures 2-5 . For micro/nano disk optical cavities, coupling properties are determined by the spatial distance between the disk and the waveguide during the fabrication process. Therefore, a tunable coupling between indirectly coupled cavity modes is required for potential applications.Recently, strong coupling between a microwave cavity mode and ferromagnetic resonance (FMR) has been realized at room temperature 6-17 . Exchange interactions lock the high density of spins in YIG into a macro-spin state, leading to strong coupling with a cavity mode which can be adjusted using an external magnetic field. Potential applications of this form of strong coupling are currently being explored. For example, indirect coupling between the FMR in two YIG spheres has produced dark magnon modes with potential uses in information storage technologies 18 , and the FMR of YIG has been indirectly coupled with a qubit through a microwave cavity mode 19 . Instead of using a microwave cavity mode to build a bridge between two oscillators, we have used the FMR in YIG to produce indirect coupling between two cavity modes.In this work, we present two cavity modes which indirectly couple via their strong coupling with the FMR in YIG at room temperature. The two cavity modes are labelled h ω1 (ω) and h ω2 (ω) respectively, and are independent of each other when there is no direct coupling between them. Here ω 1 and ω 2 are the uncoupled resonance frequencies of each cavity mode and ω is the input microwave frequency. The two cavity modes can be indirectly coupled with each other when they both individually interact with the FMR in YIG and this indirect coupling can be controlled using an external magnetic field. We found that the microwave transmission properties change dramatically for the coupled modes as the external field is tuned. Our experimental results,

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Study of photon–magnon coupling in a YIG-film split-ring resonant system

Cited by 110 publications

References 52 publications

Combined Brillouin light scattering and microwave absorption study of magnon-photon coupling in a split-ring resonator/YIG film system

Combined Brillouin light scattering and microwave absorption study of magnon-photon coupling in a split-ring resonator/YIG film system

On-chip artificial magnon-polariton device for voltage control of electromagnetically induced transparency

Indirect coupling between two cavity modes via ferromagnetic resonance

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