Nano-textured metallic surfaces for optical sensing and detection applications

Yokota, Yukie; Ueno, Kosei; Juodkazis, Saulius; Mizeikis, Vygantas; Murazawa, Naoki; Misawa, Hiroaki; Kasa, Haruya; Kintaka, Kenji; Nishii, Junji

doi:10.1016/j.jphotochem.2008.10.007

Cited by 35 publications

(32 citation statements)

References 34 publications

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“…The particles act as nano-focusing lenses creating "hot-spots" in the electromagnetic field. Methods of controlling the shape, size, and ordering of nanoparticles, and their two-or three-dimensional (2D or 3D) arrangements provide a way to control the "hot-spots" [3][4][5][6]. Polarization and angular effects become important in the light field enhancement by plasmonic nano-focusing.…”

Section: Introductionmentioning

confidence: 99%

Light enhancement in surface-enhanced Raman scattering at oblique incidence

et al. 2012

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Surface enhanced Raman scattering (SERS) measurements have been carried out at different focusing conditions using objective lenses of different numerical apertures. The experimentally observed dependence of SERS intensity of thiophenol-coated Ag nano-islands shows a close-to-linear scaling with the collection aperture. The linear relationship breaks down for large numerical apertures, which suggests that the scattering is anisotropic. Numerical simulations of realistically shaped Ag nano-islands were carried out, and the spatial distribution of hot-spots has been revealed at different heights near the nano-islands. Local field enhancements of up to 100 times were estimated. The simulation also suggests an explanation for the anisotropy in the scattering observed for larger numerical aperture objectives. This appears to be due to a reduction in the local field enhancement as the electric field vector component in the plane of the shallow metal islands reduces at larger angles of incidence.

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Section: Introductionmentioning

confidence: 99%

Light enhancement in surface-enhanced Raman scattering at oblique incidence

et al. 2012

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“…1(a)). Our modified checkerboard design, which allows for a simpler fabrication process, is different than the standard checkerboard pattern employing structures in 2D [15,16] and in 3D [29] form, which is shown to be a good SERS platform. The modified checkerboard with intentional gaps achieves highly reproducible results of high electric field enhancement with easy fabrication.…”

Section: Fabrication and Structural Characterizationmentioning

confidence: 99%

“…1(c), using electron beam deposition, a 5 nm thick chromium layer was coated on the substrate serving as the adhesion promoter for bottom gold layer, preventing charging effects during electron-beam lithography (EBL) process and making possible of imaging the structures after fabrication with scanning electron microscopy (SEM). As discussed in the literature, sidewall formation here can reduce the field enhancement [29]. To prevent the sidewall formation in the 3D-structure and facilitate the lift-off process for the 2D-structure, a bilayer poly(methyl methacrylate) (PMMA) film consisting of PMMA 495 K and PMMA 950 K molecular weight layers were spin-coated as the EBL resist, which provides undercut following the development step (as sketched in (I) of Fig.…”

Section: Fabrication and Structural Characterizationmentioning

confidence: 99%

Nanoplasmonic surfaces enabling strong surface-normal electric field enhancement

2013

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Conventional two-dimensional (2D) plasmonic arrays provide electric field intensity enhancement in the plane, typically with a surface coverage around 50% in the plan-view. Here, we show nanoplasmonic three-dimensional (3D) surfaces with 100% surface coverage enabling strong surface-normal field enhancement. Experimental measurements are found to agree well with the full electromagnetic solution. Along with the surface-normal localization when using the plasmonic 3D-surface, observed maximum field enhancement is 7.2-fold stronger in the 3D-surface than that of the 2D counterpart structure. 3D-plasmonic nonplanar surfaces provide the ability to generate volumetric field enhancement, possibly useful for enhanced plasmonic coupling and interactions.

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“…[17][18][19] An adequate top-down approach to fabricate SERS arrays providing a reproducible field enhancement is electron beam lithography (EBL). [20][21][22][23][24][25][26][27][28][29][30] Recently, we investigated regular patterend nanostructures produced by means of EBL with respect to their use as highly reproducible SERS substrates for biochip applications. It was shown, that both LSPP and PSPP modes were excited at the metal dielectric interface, resulting in doubly resonant plasmonic arrays.…”

Section: Introductionmentioning

confidence: 99%

Investigation on the Second Part of the Electromagnetic SERS Enhancement and Resulting Fabrication Strategies of Anisotropic Plasmonic Arrays

et al. 2010

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In general, the electromagnetic mechanism is understood as the strongest contribution to the overall surface-enhanced Raman spectroscopy (SERS) enhancement. Due to the excitation of surface plasmons, a strong electromagnetic field is induced at the interfaces of a metallic nanoparticle leading to a drastic enhancement of the Raman scattering cross-section. Furthermore, the Raman scattered light expierences an emission enhancement due to the plasmon resonances of the nanoantennas. Herein, this second part of the electromagnetic enhancement phenomenon is investigated for different Raman bands of crystal violet by utilizing the anisotropic plasmonic character of gold nanorhomb SERS arrays. We aim at evaluating the effects of localized and propagating surface plasmon polariton modes as well as their combination on the scattered SERS intensity. From that point of view, design and fabrication strategies towards the fabrication of SERS arrays for excitation wavelengths in the visible and near-infrared (NIR) spectral region can be given, also using a double-resonant electromagnetic enhancement.

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Nano-textured metallic surfaces for optical sensing and detection applications

Cited by 35 publications

References 34 publications

Light enhancement in surface-enhanced Raman scattering at oblique incidence

Light enhancement in surface-enhanced Raman scattering at oblique incidence

Nanoplasmonic surfaces enabling strong surface-normal electric field enhancement

Investigation on the Second Part of the Electromagnetic SERS Enhancement and Resulting Fabrication Strategies of Anisotropic Plasmonic Arrays

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