Surface Plasmon Resonance Enhanced Magneto-Optics (SuPREMO): Faraday Rotation Enhancement in Gold-Coated Iron Oxide Nanocrystals

Jain, Prashant K.; Xiao, Yanhong; Walsworth, Ronald L.; Cohen, Adam E.

doi:10.1021/nl900007k

Cited by 283 publications

(239 citation statements)

References 71 publications

(179 reference statements)

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“…in. [15][16][17] The work in 15 reports on an experimental evidence for a 2-3 fold enhancement of magneto-optical activity in coated nano-particles. The efforts in 16,17 are limited to graphene metasurfaces.…”

Section: 8mentioning

confidence: 99%

Dark mode–Faraday rotation synergy for enhanced magneto-optics

2017

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We examine the efficacy of Dark-mode plasmonics as a platform for enhanced magneto-optics. Dark-mode of a small particle consists of two coexisting equal-intensity and mutually opposing dipolar excitations. Each of these two opposing dipoles may even resonate at or near the dark-mode frequency, but the net dipole moment vanishes due to the mutual cancelation between the opposing dipoles. We show that application of external magnetic bias may alleviate the intense destructive interference. Furthermore, under external magnetic bias the opposing dark-resonances of a plasmonic particle shift in opposite directions and create a region of extremely sensitive Faraday rotation. We show that the magnetized dark resonance in lossless Ag-like particle may provide more than 20 degrees rotation under magnetic fields of the order of 1-2 Tesla, exhibiting magneto-plasmonic activity that is 2-3 orders of magnitude larger than that observed in conventional plasmonic particle of the same material.Keywords: Magneto-optics, polarization rotation, nanoparticles * To whom correspondence should be addressed 1 Dark modes of an open optical structure can be described as states of excitations that incorporate mutually opposing local dipoles whose far-fields interfere destructively. The net dipolar excitation then vanishes, resulting in a significant reduction of the far-field radiation, and consequently a reduction of the associated radiation damping and bandwidth. [1][2][3][4][5][6][7][8] This, in turn, may trap optical fields in a structure that is inherently coupled to a continuum. More formally, dark modes can be viewed as manifestations of discrete eigenvalues embedded within the continuous spectrum of the associated non-compact scattering operator. Dark modes were suggested as candidates for electromagnetic energy storage, enhanced biological and chemical sensors, and nanoscale waveguides. These modes can be supported by simple structures such as nano-dimers (see, e.g. the "anti-bonding" plasmons in Ref.[ 1]), trimers, 6clustered nano-rods 3 and spheres. 7,8In a seemingly unrelated research endeavor, nonreciprocal magneto-optics and its implementation for one-way waveguides, optical isolators and circulators, and Faraday rotators, have been under intensive study. 9-14 Currently the major drawback of nonreciprocal magneto-optics is the requirement for strong magnetic bias B 0 . Efforts to reduce B 0 for various applications (e.g. Faraday polarization rotation) in plasmonic structures can be found, e.g. in. [15][16][17] The work in 15 reports on an experimental evidence for a 2-3 fold enhancement of magneto-optical activity in coated nano-particles. The efforts in 16,17 are limited to graphene metasurfaces.Here we study the effect of bias magnetization on plasmonic particle dark modes, and explore its potential applications as a new platform for non-reciprocal optics.As a simple and physically transparent test-case, we consider the core-shell spherical particle shown in Fig. 1, made of two plasmonic materials with close, but ...

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Section: 8mentioning

confidence: 99%

Dark mode–Faraday rotation synergy for enhanced magneto-optics

2017

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“…Fe 3 O 4 @ag core/shell nanoparticles: In view of an extraordinary properties of Iron Oxide Biomagnetic Nanoparticles (IO-BMNPs) with smallest size, surface modified (biocompatible coatings), chemical, biological and significant magnetic properties can expect to have multifunctional applications in biomedicine like Drug Delivery (Targeting) systems (DDS/DTS), Magnetic Hyperthermia Treatment (MHT) [26], Magnetic Optical Devices (MOD) [27], Magnetic Resonance Imaging (MRI) [28], immunoassay and sort of that. In order to synthesis coated Iron Oxide magnetic nanoparticles (Fe 3 O 4 @ Ag) through Polyol method, 1.35 g iron (III) chloride hexahydrate (FeCl 3 .6H 2 O) was dissolved in 40 mL polyethylene glycol using an ultrasonic bath to reached acidic PH.…”

Section: Iron Oxide Core/shell Nanoparticles (Iocsn)mentioning

confidence: 99%

Iron Oxide Biomagnetic Nanoparticles (IO-BMNPs); Synthesis, Characterization and Biomedical Application–A Review

Nochehdehi¹,

Thomas²,

Sadri³

et al. 2017

J Nanomed Nanotechnol

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Nanotechnology is a multidisciplinary branch of science which encompasses numerous diverse fields of science and technology, ranging from biomedical, pharmaceutical, agricultural, environmental, advanced materials, chemical science, physics, electronics, information technology, and so on. Physical and Chemical properties as a major advantages of Nanoparticles can be used in various applications from Industries to medicine. Besides, Magnetic nanoparticles for medical applications have been developed by many researchers. In recent decades, it has received attention by virtue of their potential for applications in different fields. Due to several advantages and widespread applications of magnetic Nanoparticles in biotechnology, medical, material science, engineering, and environmental areas, much attention has been paid to the synthesis of different kinds of Biomagnetic nanoparticles (BMNPs). Core-shell nanoparticles include of coated various materials like: biopolymers (Chitosan, PAA) and bioceramics (Hydroxyapatite) as a shell on top of them and different hard and soft materials like metal oxide (Iron oxide and Cob alt composite) as a core. Improved properties of core-shell nanoparticles like less cytotoxicity, increase biocompatibility, decrease in an interactions with biomolecules, increase physicochemical stability and sort of that, can be due to their use in biological applications. After reviewing several research and review articles and synthesis procedure of Iron based Bio-magnetic Nanoparticles (BMNPs), we should emphasize that, It can be used in different applications like magnetic resonance imaging (MRI), drug delivery systems (DDS), immunoassay, also specially in diagnosis and treatment of cancer via hyperthermia (heat therapy) method.

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“…SPPs are electromagnetic waves that propagate along the interface between metal-dielectric or metal-air media. These systems show significant future promises, especially, in fulfilling the demand for ultra-fast sensing and detection, higher signal-to-noise ratio (SNR) sensing, and miniature devices, which are needed in monitoring biological and chemical changes taking place in solutions with extremely low protein concentration [11][12][13][14][15][16]18,170,171]. This magnetic field enhanced sensing utilizes Surface plasmon resonance (SPR) in the presence of H field, which is the optical excitation of charge electron densities.…”

Section: Potential Applicationsmentioning

confidence: 99%

Ferromagnetic Multilayers: Magnetoresistance, Magnetic Anisotropy, and Beyond

2016

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Abstract:Obtaining highly sensitive ferromagnetic, FM, and nonmagnetic, NM, multilayers with a large room-temperature magnetoresistance, MR, and strong magnetic anisotropy, MA, under a small externally applied magnetic field, H, remains a subject of scientific and technical interest. Recent advances in nanofabrication and characterization techniques have further opened up several new ways through which MR, sensitivity to H, and MA of the FM/NM multilayers could be dramatically improved in miniature devices such as smart spin-valves based biosensors, non-volatile magnetic random access memory, and spin transfer torque nano-oscillators. This review presents in detail the fabrication and characterization of a few representative FM/NM multilayered films-including the nature and origin of MR, mechanism associated with spin-dependent conductivity and artificial generation of MA. In particular, a special attention is given to the Pulsed-current deposition technique and on the potential industrial applications and future prospects. FM multilayers presented in this review are already used in real-life applications such as magnetic sensors in automobile and computer industries. These material are extremely important as they have the capability to efficiently replace presently used magnetic sensors in automobile, electronics, biophysics, and medicine, among many others.

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Surface Plasmon Resonance Enhanced Magneto-Optics (SuPREMO): Faraday Rotation Enhancement in Gold-Coated Iron Oxide Nanocrystals

Cited by 283 publications

References 71 publications

Dark mode–Faraday rotation synergy for enhanced magneto-optics

Dark mode–Faraday rotation synergy for enhanced magneto-optics

Iron Oxide Biomagnetic Nanoparticles (IO-BMNPs); Synthesis, Characterization and Biomedical Application–A Review

Ferromagnetic Multilayers: Magnetoresistance, Magnetic Anisotropy, and Beyond

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