Ultrahigh resolution long range surface plasmon-based sensor

Slavı́k, Radan; Homola, Jiřı́

doi:10.1016/j.snb.2006.08.020

Cited by 258 publications

(139 citation statements)

References 10 publications

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“…Due to the high magnetic moment, it offers the possibility of having the strong magnetic modulation of permittivity at room temperature when excited by an optical radiation near infra-red. By combining plasmonic Au and ferromagnetic Co into Ti buffer and a protective layer, P c and by optimizing the multilayer configuration, the influence of surface plasmons and magnetism on sensitivity and device performance can be exploited [9][10][11][12][13][14][15][16][17].…”

Section: Introductionmentioning

confidence: 99%

Magneto-Optic Surface Plasmon Resonance Ti/Au/Co/Au/Pc Configuration and Sensitivity

Rizal

2018

Magnetochemistry

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Magneto-optic surface plasmon resonance (MOSPR)-based sensors are highly attractive as next-generation biosensors. However, these sensors suffer from oxidation leading to degradation of performance, reproducibility of the sensor surface, because of the difficulty of removing adsorbed materials, and degradation of the sensor surface during surface cleaning and these limit their applications. In this paper, I propose MOSPR-based biosensors with 0 to 15 nm thick inert polycarbonate laminate plastic as a protective layer and theoretically demonstrate the practicability of my approach in water-medium for three different probing samples: ethanol, propanol, and pentanol. I also investigate microstructure and magnetic properties. The chemical composition and layered information of the sensor are investigated using X-ray reflectivity and X-ray diffraction analyses and these show distinct face-centered-cubic (fcc)-Au (111) phases, as dominated by the higher density of conduction electrons in Au as compared to Co. The magnetic characterization measured with the in-plane magnetic field to the sensor surface for both the as-deposited and annealed multilayers showed isotropic easy axis magnetization parallel to the multilayer interface at a saturating magnetic field of <100 Oersted (Oe). The sensor showed a maximum sensitivity of 5.5 × 10 4 %/RIU (refractive index unit) for water-ethanol media and the highest detection level of 2.5 × 10 −6 for water-pentanol media as the protective layer is increased from 0 to 15 nm.

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Section: Introductionmentioning

confidence: 99%

Magneto-Optic Surface Plasmon Resonance Ti/Au/Co/Au/Pc Configuration and Sensitivity

Rizal

2018

Magnetochemistry

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“…For frequencies above the near-infrared, the SPP wavelength can be significantly smaller than the wavelength of unbounded plane waves in the dielectric region. The field confinement and wavelength reduction achievable with SPPs hold promise to enabling dramatic miniaturization of the feature sizes of conventional optical devices [1][2][3] and optical sensors [4]. Due to the lack of widespread SPP sources, SPP devices typically incorporate a coupling structure to enable plane-wave modes to excite SPP modes [5].…”

Section: Introductionmentioning

confidence: 99%

Enhancing the efficiency of slit-coupling to surface-plasmon-polaritons via dispersion engineering

Mehfuz¹,

Maqsood²,

Chau³

2010

Opt. Express

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Abstract:We describe a simple method for enhancing the efficiency of coupling from a free-space transverse-magnetic (TM) plane-wave mode into a surface-plasmon-polariton (SPP) mode. The coupling structure consists a metal film with a dielectric-filled slit and a planar, dielectric layer on the slit-exit side of the metal film. By varying the dielectric layer thickness, the wavevector of the SPP mode on the metal surface can be tuned to match the wavevector magnitude of the modes emanating from the slit exit, enabling high-efficiency radiation coupling into the SPP mode at the slit exit. An optimal dielectric layer thickness 100 nm yields a visible-frequency SPP coupling efficiency 4 times greater than the SPP coupling efficiency without the dielectric layer. Commensurate coupling enhancement is observed spanning the regime 400 nm ≤ λ 0 ≤ 700 nm. We map the dependence of the SPP coupling efficiency on the slit width, the dielectric-layer thickness, and the incident wavelength to fully characterize this SPP coupling methodology.

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“…The kinetics of affi nity binding reactions was observed by using an another SPR spectrometer that utilized wavelength modulation of resonant coupling to guided waves. [ 28 ] In this system, a polychromatic light from a supercontinuum source (WhiteLase micro, Fianium, UK) was collimated and made incident on BK7 glass prism at a fi xed angle θ . Refl ected light was coupled into a spectrometer (S2000, Ocean Optics, USA) to perform spectral analysis and wavelength shifts in resonant dips occurring in the wavelength refl ectivity spectrum R ( λ ) were determined in time by a dedicated software SPR UP (developed at the Institute of Photonics and Electronics in Prague, Czech Republic).…”

Section: Optical Setupsmentioning

confidence: 99%

Molecularly Imprinted Polymer Waveguides for Direct Optical Detection of Low‐Molecular‐Weight Analytes

Sharma

Petri

Jonas

et al. 2014

Macro Chemistry & Physics

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New composite layer architecture of 3D hydrogel polymer network that is loaded with molecularly imprinted polymer nanoparticles (nanoMIP) is reported for direct optical detection of low-molecular-weight compounds. This composite layer is attached to the metallic surface of a surface plasmon resonance (SPR) sensor in order to simultaneously serve as an optical waveguide and large capacity binding-matrix for imprinted target analyte. Optical waveguide spectroscopy (OWS) is used as a labelfree readout method allowing direct measurement of refractive index changes that are associated with molecular binding events inside the matrix. This approach is implemented by using a photocrosslinkable poly( N -isopropylacrylamide)-based hydrogel and poly[(ethylene glycol dimethylacrylate)-(methacrylic acid)] nanoparticles that are imprinted with L -Boc-phenylalanine-anilide ( L -BFA, molecular weight 353 g mol −1 ). Titration experiments with the specifi c target and other structurally similar reference compounds show good specifi city and limit of detection for target L -BFA as low as 2 × 10 −6 M .

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Ultrahigh resolution long range surface plasmon-based sensor

Cited by 258 publications

References 10 publications

Magneto-Optic Surface Plasmon Resonance Ti/Au/Co/Au/Pc Configuration and Sensitivity

Magneto-Optic Surface Plasmon Resonance Ti/Au/Co/Au/Pc Configuration and Sensitivity

Enhancing the efficiency of slit-coupling to surface-plasmon-polaritons via dispersion engineering

Molecularly Imprinted Polymer Waveguides for Direct Optical Detection of Low‐Molecular‐Weight Analytes

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