Optimization of the TMOKE response using the ATR configuration

Melo, L. G. C.; Santos, Amilton M.; Álvarez-Prado, L. M.; Souche, Y.

doi:10.1016/j.jmmm.2006.10.998

Cited by 7 publications

(4 citation statements)

References 4 publications

(4 reference statements)

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“…In particular, the highest MO effect is exhibited by the pure 20 nm Co layer. According to a previous publication [31], when gold is introduced in the multilayer, the MO effect is always maximized when cobalt is in contact with the external dielectric medium (d AuTop = 0), i.e., in the region where the electromagnetic field associated to the SPP is maximized. However, as we have previously discussed, a larger MO effect does not necessarily mean a higher sensitivity for the biosensing measurements.…”

Section: Theoretical Analysis Of the Sensor Response Of Mp Multilayermentioning

confidence: 86%

Suitable combination of noble/ferromagnetic metal multilayers for enhanced magneto-plasmonic biosensing

Regatos¹,

Sepúlveda²,

Fariña³

et al. 2011

Opt. Express

113

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We present a theoretical and experimental study on the biosensing sensitivity of Au/Co/Au multilayers as transducers of the magneto-optic surface-plasmon-resonance (MOSPR) sensor. We demonstrate that the sensing response of these magneto-plasmonic (MP) transducers is a trade-off between the optical absorption and the magneto-optical activity, observing that the MP multilayer with larger MO effect does not provide the best sensing response. We show that it is possible to design highly-sensitive MP transducers able to largely surpass the limit of detection of the conventional surface-plasmon-resonance (SPR) sensor. This was proved comparing the biosensing performance of both sensors for the label-free detection of short DNA chains hybridization. For this purpose, we used and tested a novel label-free biofunctionalization protocol based on polyelectrolytes, which increases the resistance of MP transducers in aqueous environments.

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Section: Theoretical Analysis Of the Sensor Response Of Mp Multilayermentioning

confidence: 86%

Suitable combination of noble/ferromagnetic metal multilayers for enhanced magneto-plasmonic biosensing

Regatos¹,

Sepúlveda²,

Fariña³

et al. 2011

Opt. Express

113

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show abstract

“…More recently, a deeper analysis of this kind of systems has been carried out, focused mainly in the transversal confi guration, where the plasmon excitation, [ 131 ] the dependence on the ferromagnetic layer thickness [ 132 ] and its position within the layer, [ 78,133,134 ] the nature of the plasmonic material, [ 135,136 ] the crystalline and interface quality, [ 137 ] have been studied in a series of noble metal/ferromagnetic/noble metal trilayer structures or nanocomposite [ 138,139 ] thin fi lms. For example, Figure 11 shows how both the refl ectivity (which is related to the SPP excitation quality) and the purely MO component, ΔR pp here, can be optimized by appropriate choice of the layer thicknesses to obtain the desired MO enhancement.…”

Section: Continuous Layersmentioning

confidence: 99%

Magnetoplasmonics: Combining Magnetic and Plasmonic Functionalities

Armelles¹,

Cebollada²,

García‐Martín³

et al. 2013

Advanced Optical Materials

556

422

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“…To the best of our knowledge, this is the first time that such high sensitivity for an MOSPR sensor using the R PP /R PP signal has been found. This ultra-high-sensitivity MOSPR sensor has a R PP /R PP signal value as high as 151.44, which is about 1-2 orders larger than those in [11,12] and is the main reason for such high sensitivity. The sensitivity of the sensor using the R PP /R PP signal is very sensitive to the film parameters.…”

Section: Resultsmentioning

confidence: 90%

“…The Co/Au magneto-plasmonic sensor has been proved to possess a three-fold sensitivity increase over a standard SPR sensor [10]. The maximal R PP signal for the Au/Co/Au film is proposed to occur when the total Au film thickness is 30 nm [11]. The variation of the R PP /R PP signal with the incident angle for a sensor with Au/Co/Au film is considered for two cases, with variation of the underlay or overlay Au film [12].…”

Section: Introductionmentioning

confidence: 99%

Sensitivity enhancement of magneto-optic surface plasmon resonance sensors with noble/ferromagnetic metal heterostructure

2014

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This paper reports strategies of sensitivity enhancement for magneto-optic surface plasmon resonance (MOSPR) sensors using metal heterostructure for two types of measured signals, ordinary and normalized reflectivity changes ( R PP and R PP /R PP ). The sensitivities using the R PP and R PP /R PP signals are effectively enhanced with the improvement as large as 58.91% and several orders by adjusting the device parameters. This paper demonstrates the occurrence of the maximal sensitivities for the R PP and R PP /R PP signals at different incident angles and composite film parameters for the first time. The sensing using the R PP /R PP signal requires a smaller total film thickness, a larger thickness ratio of the Co/Au film and a smaller thickness ratio of the underlay/overlay Au film than that using the R PP signal. Besides, the sensing using the R PP /R PP signal has a much higher sensitivity than that using the R PP signal. The conditions for maximal sensitivity and the physics of sensitivity enhancement for MOSPR sensors are also discussed. The newly-discovered ultra-high sensitivity using the R PP /R PP signal, which is several orders larger than that in the literature, has strict parameter tolerance and its realization requires accurate tuning of the device parameters.

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Optimization of the TMOKE response using the ATR configuration

Cited by 7 publications

References 4 publications

Suitable combination of noble/ferromagnetic metal multilayers for enhanced magneto-plasmonic biosensing

Suitable combination of noble/ferromagnetic metal multilayers for enhanced magneto-plasmonic biosensing

Magnetoplasmonics: Combining Magnetic and Plasmonic Functionalities

Sensitivity enhancement of magneto-optic surface plasmon resonance sensors with noble/ferromagnetic metal heterostructure

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