Magneto-optical Effects Enhanced by Surface Plasmons in Metallic Multilayer Films

Safarov, V. I.; Kosobukin, V. A.; Hermann, C.; Lampel, G.; Peretti, J.; Marlière, C.

doi:10.1103/physrevlett.73.3584

Cited by 172 publications

(106 citation statements)

References 18 publications

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“…The MO effects of a MP multilayer are strongly amplified when the SPP excitation condition is satisfied, [17][18][19] which is reflected in a great enhancement of ⌬R pp / R pp ͓see Fig. 1͑b͔͒ in resonance condition.…”

Section: Introductionmentioning

confidence: 99%

Au/Fe/Au multilayer transducers for magneto-optic surface plasmon resonance sensing

Regatos¹,

Fariña²,

Calle³

et al. 2010

Journal of Applied Physics

100

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In this paper, we analyze the magnetoplasmonic ͑MP͒ features and sensing capabilities of Au/Fe/Au trilayer structures, as transducers of the magneto-optic surface plasmon resonance ͑MOSPR͒ biosensor. This biosensor, which can surpass the sensitivity of the standard SPR sensor, is based on a MP modulation technique generated by the simultaneous stimulation of the surface plasmon polaritons ͑SPP͒ and the transversal magneto-optical Kerr effect ͑TMOKE͒. We study the magneto-optical activity of the trilayers as a function of the thickness and position of the Fe layer. We first demonstrate that this kind of structure allows modulating the SPP through an external magnetic field and moreover, induce a strong enhancement of the TMOKE effect. The modulation of the SPP is linearly proportional to the thickness of Fe layer and inversely proportional to the distance between the Fe layer and the external dielectric medium. Finally, we experimentally confirm a twofold increase in the MOSPR sensitivity with respect to the intensity-interrogated SPR biosensor in bulk refractive-index changes, keeping a similar chemical resistance and stability, unprecedented in other MP transducers, and biofunctionalization protocols.

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Section: Introductionmentioning

confidence: 99%

Au/Fe/Au multilayer transducers for magneto-optic surface plasmon resonance sensing

Regatos¹,

Fariña²,

Calle³

et al. 2010

Journal of Applied Physics

100

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“…The same experimental set-up has been used to study magneto-optical effects in a metallic Au/Co/Au sandwich [6]. In this case the interaction of the light electric field with the gold surface plasmon leads to a resonant enhancement of the magnetooptical effects in the evanescent mode, which could lead to image submicronic domains with signal-over-total-intensity ratio as high as a few percent.…”

Section: Discussionmentioning

confidence: 99%

Near-field magneto-optical microscopy

Safarov

Kosobukin

Hermann

et al. 1994

Microsc. Microanal. Microstruct.

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Abstract. 2014 A scanning tunneling optical microscope (STOM) operating in total reflexion condition with variable incident angle and polarization sensitive detection of the evanescent mode has been developed to study near-field magneto-optical properties of thin magnetic films. The sample is deposited on the external face of a prism and illuminated in total reflexion conditions with linearly polarized laser light. The evanescent mode close to the surface is detected with a tip-ending monomode optical fiber connected at its other end to a photomultiplier tube equipped with a light-polarization analyzer. The polarization sensitivity of the whole system, which was found to depend on the tip condition, was characterized on the bare prism with s-and p-polarized excitations. The magneto-optical effect in the evanescent mode is measured through a lock-in amplifier by modulating the external magnetic field produced by a coil surrounding the tip. With this set-up we have mainly studied a dielectric garnet film exhibiting perpendicular magnetization. The images, obtained on this sample by measuring the magneto-optical effect under very low amplitude of the external magnetic field modulation, show up submicronic details due to magnetic domain wall motion.Microsc. Microanal. Microstruct. 5 (1994)

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“…6͑a͒, data not shown here͔ both R and ⌬R / R basically do not exhibit any angular dependence. It has previously been shown that the values for ⌬R / R in Au/Co/Au under SPP excitation conditions are one order of magnitude larger than those without SPP excitation 16,19 due both to a simultaneous reduction in the reflectivity of the system and to an enhancement of the electromagnetic field at the MO active layer, i.e., the Co layer. For the specific case of 5 nm Au/5 nm Ag/8 nm Co/7 nm Ag, shown in Fig.…”

Section: Surface Plasmon Resonance Effects On the Mo Activitymentioning

confidence: 99%

“…For example, in the Au/Co/Au system, the MO activity can be greatly enhanced when the SPP resonance is excited: 16,[18][19][20][21] in this situation the light absorption is maximum and, for specific layer thickness, the electromagnetic field of the light is greatly enhanced at the MO active layer ͑Co in this case͒. This leads, respectively, to a reduction in the system reflectivity and to an enhancement in the magnetic component of the MO activity 16,22 which altogether are responsible of the enhanced global MO response.…”

Section: Introductionmentioning

confidence: 99%

Intertwined magneto-optical and plasmonic effects in Ag/Co/Ag layered structures

Ferreiro‐Vila¹,

González-Díaz²,

Fermento³

et al. 2009

Phys. Rev. B

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Surface plasmon polariton ͑SPP͒ excitation effects on the magneto-optical ͑MO͒ activity of Au capped Ag/Co/Ag trilayers are studied as a function of Co thickness. An enhancement of the transverse MO Kerr signal under SPP excitation as compared with that obtained without SPP excitation is measured with a maximum value of 150 times obtained for the trilayer with 8 nm Co. Such enhancement on the magneto-optical activity due to SPP excitation is also five times higher than that obtained in Au/Co/Au trilayers in similar conditions. The lower optical absorption in the studied range and the sharper plasmon resonance of Ag vs Au are responsible for these values. On the other hand, magnetic field-induced SPP wavevector modulation ͑⌬k / k͒ SPP is studied for these trilayers and compared both with previous results in the Au/Co/Au system as well as with the theory. In the wavelength considered here, the obtained values are similar for both Ag-and Au-based structures and on the order of 10 −4 , pinpointing the role of the magnetic layer on the SPP wavevector modulation.

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Magneto-optical Effects Enhanced by Surface Plasmons in Metallic Multilayer Films

Cited by 172 publications

References 18 publications

Au/Fe/Au multilayer transducers for magneto-optic surface plasmon resonance sensing

Au/Fe/Au multilayer transducers for magneto-optic surface plasmon resonance sensing

Near-field magneto-optical microscopy

Intertwined magneto-optical and plasmonic effects in Ag/Co/Ag layered structures

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