Ferromagnetic Subwavelength Periodic Nanogroove Structure with High Magneto-Optical Kerr Effect for Sensing Applications

Du, Guoqiang; Zuo, Yong; Liu, Na; Liu, Zhifeng; Zhang, Lin; Zhang, Weiwei

doi:10.1021/acsami.3c06649

Cited by 5 publications

(4 citation statements)

References 29 publications

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“…But in specific nanostructures, the electric field direction will undergo a change locally, inducing the nontrivial MO effect (s-polarized TMOKE). [28] This mechanism of local changes in electric field directions has been confirmed in recent studies focused on s-polarized TMOKE. [22,32,33] Since s-polarized TMOKE is highly dependent on the geometrical effect of the nanopillar structure, it is worth exploring this phenomenon in other similar nanostructures.…”

Section: Resultssupporting

confidence: 53%

“…But in specific nanostructures, the electric field direction will undergo a change locally, inducing the nontrivial MO effect (s‐polarized TMOKE). [ 28 ] This mechanism of local changes in electric field directions has been confirmed in recent studies focused on s‐polarized TMOKE. [ 22,32,33 ]…”

Section: Resultsmentioning

confidence: 57%

“…Thus, the research on improving TMOKE intensity has been widely reported in recent years. Many optical resonant modes such as SPR, [3,[25][26][27][28] waveguide (WG) mode, [22,29] optical Tamm (OT) mode, [30] and Fabry-Perot effect [31] can be excited in designed nanostructures to enhance TMOKE. Comparatively, SPR and WG modes are more effective since their wave vectors can be nonreciprocally modified under the action of an external magnetic field, leading to a considerable enhancement of TMOKE.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Unconventional Transverse Magneto‐Optical Kerr Effect in Cobalt Nanopillar Arrays

Cheng,

Yang,

Liu

et al. 2024

Advanced Optical Materials

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Novel magneto‐optical (MO) properties can be actualized through well‐designed nanostructures, greatly improving the application value of MO effects. As only p‐polarized light can generate transverse magneto‐optical Kerr effect (TMOKE) in traditional MO materials, it is quite challenging and valuable to effectuate TMOKE under s‐polarization incidence at optical frequencies. The constructed nanopillar structures in this work can realize a clear TMOKE under both s‐polarization and p‐polarization incidences, as proved by experiments and simulations. Under s‐polarized incident light with an elevation angle of 45°, electric dipole resonance (EDR) and electric quadrupole resonance (EQR) are excited, resulting in the significant enhancement of TMOKE (five orders of magnitude higher than for the planar Co film). The intensity of s‐polarized TMOKE shows an increase with the enhancing diameter and height of the nanopillar structure. The amplitude of p‐polarized TMOKE is also appreciably increased due to the excitation of surface plasmon polaritons (SPPs) and localized surface plasmons (LSPs). Moreover, the Fe and Ni nanopillars display similar reflectivity and s‐polarized TMOKE behaviors in simulations. The s‐polarized TMOKE is unexpectedly observed in ferromagnetic metals for the first time, which builds up a considerable platform for the development and application of novel MO phenomena.

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Section: Resultssupporting

confidence: 53%

Section: Resultsmentioning

confidence: 57%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Unconventional Transverse Magneto‐Optical Kerr Effect in Cobalt Nanopillar Arrays

Cheng,

Yang,

Liu

et al. 2024

Advanced Optical Materials

View full text Add to dashboard Cite

show abstract

“…The TMOKE response with a FWHM of 0.00997 • is obtained through the excitation of high-quality SPR and the resonant coupling between localized modes and propagation modes during the simulation process. The amplitude of the TMOKE signal reaches a remarkable 0.99, representing an improvement of at least one order of magnitude compared to previously reported simulation model with similar structure [22][23][24]. Further, the structure was simulated in gas environments with varying refractive indices, resulting in surface sensitivity of up to 207.5 deg RIU −1 (Refractive Index Unit) and achieving an exceptionally high FOM of the order of 10 3 -10 4 RIU −1 .…”

Section: Introductionmentioning

confidence: 74%

Hybrid magneto-plasmonic structure consisting of hexagonal periodic nanodisks array with giant transverse magneto-optical Kerr effect for sensing application

Wang,

Cui,

Zhu

et al. 2024

J. Phys. D: Appl. Phys.

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The present study proposes a theoretical design of the magneto-optical surface plasmon resonance (MOSPR) refractive index sensor that utilizes a magnetic field for modulating the dispersion of surface plasmon. This sensor based on the transverse magneto-optical Kerr effect (TMOKE) is constructed using a hybrid magneto-plasmonic film covered with an array of hexagonal periodic Au nanodisks. The structural parameters were optimized to obtain the Fano shape TMOKE response characterized by an extremely narrow bandwidth (0.00997°) and remarkably high amplitude (0.99). The excitation of the optimal surface plasmon resonance (SPR) and the resonance enhancement effect of multi-mode coupling enables us to achieve a surface sensitivity of 207.5 deg/RIU and a high figure of merit (FOM) of the order of 104 RIU−1, surpassing conventional SPR and MOSPR sensors by at least one order of magnitude. The present study offers a comprehensive guideline for the design of high-performance magneto-plasmonic sensors, facilitating instrument miniaturization and manufacturing cost reduction.

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Magnetoplasmonic Gratings Induced an Unusual Magneto‐Optical Kerr Effect at Optical Frequencies

Cheng,

Yang,

Sun

et al. 2024

Laser & Photonics Reviews

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Transverse magneto‐optical Kerr effect (TMOKE) has attracted much attention due to its widespread application in nonreciprocal photon and sensing devices. The vast majority of studies related to TMOKE are mainly focused on p‐polarized incidence as a result of the stereotype that only p‐polarized incidence can generate TMOKE in conventional magnetic materials. Thanks to the powerful ability of metamaterials to regulate light, in recent years, the TMOKE under s‐polarized incidence is explored and observed successfully. Nevertheless, different from the universality and high amplitude of p‐polarized TMOKE, the excitation of s‐polarized TMOKE is pretty rare, and the peak values of s‐polarized TMOKE in the reported research are really weak, which limits its application potential to a large extent. Here, the iron‐based grating structure is proposed that excites surface plasmon polaritons (SPPs) and then causes the highest peak value of s‐polarized TMOKE at optical frequencies to date, which is seven orders of magnitude higher than that of the planar Fe film. Besides, its refractive index sensitivity reaches up to 685 nm RIU−1. The work broadens the design path of s‐polarized TMOKE as a promising candidate to promote the development of novel magnetoplasmonic sensors and nonreciprocal photon devices.

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Ferromagnetic Subwavelength Periodic Nanogroove Structure with High Magneto-Optical Kerr Effect for Sensing Applications

Cited by 5 publications

References 29 publications

Unconventional Transverse Magneto‐Optical Kerr Effect in Cobalt Nanopillar Arrays

Unconventional Transverse Magneto‐Optical Kerr Effect in Cobalt Nanopillar Arrays

Hybrid magneto-plasmonic structure consisting of hexagonal periodic nanodisks array with giant transverse magneto-optical Kerr effect for sensing application

Magnetoplasmonic Gratings Induced an Unusual Magneto‐Optical Kerr Effect at Optical Frequencies

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