Angle-Resolved Surface-Enhanced Raman Scattering on Metallic Nanostructured Plasmonic Crystals

Baumberg, Jeremy J.; Kelf, Timothy A.; Sugawara, Yoshihiro; Cintra, S.H.L.; Abdelsalam, Mamdouh E.; Bartlett, P. N.; Russell, Andrea E.

doi:10.1021/nl051618f

Cited by 254 publications

(256 citation statements)

References 25 publications

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“…Cy5t shows SERRS having a molecular resonance with the 633 nm laser excitation in addition to the usual plasmonic resonances on these substrates at this thickness (0.75D). 21 There is a one-to-one correspondence between most of the bands for the chromophore between both the indocarbocyanine dyes, with the bands showing the expected shifts due to the difference in the number of methine bonds. The signals for Raman bands are enhanced around 1000 times in the case of SERRS vis-a`-vis SERS as measured on our substrates.…”

Section: Resultsmentioning

confidence: 93%

“…The 600 nm void films have been well studied and have distinct plasmon resonances at 0.75D film thickness corresponding to our 633 nm laser. 21,28 Hence, it was chosen for the study reported in this paper. The film heights are as estimated from the pore-mouth diameters of the voids determined by examining their SEM images.w The method has been earlier described by Bartlett et al 27 Surface immobilization of molecules After cleaning, the substrates were dipped in an ethanolic solution of cysteamine (10 mM) for 24 h. The substrates were then washed and dried under argon.…”

Section: Preparation Of Structured Substratesmentioning

confidence: 99%

“…20 These have been proven to generate tunable plasmon resonances 21 for SERS. 22,23 We have recently shown the tunability of our substrates for SERS even with a near-infrared source (1064 nm laser).…”

Section: Introductionmentioning

confidence: 99%

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Reproducible SERRS from structured gold surfaces

Mahajan

Baumberg

Russell

et al. 2007

Phys. Chem. Chem. Phys.

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Metallic substrates with ordered spherical cavities have been shown to be very effective for surface-enhanced Raman scattering (SERS) and can be fabricated reproducibly using electrodeposition. The sensitivity of detection is increased by several orders of magnitude by using surface-enhanced resonance Raman scattering (SERRS). In this report we demonstrate SERRS for the first time on electrodeposited gold films templated with colloidal spheres and demonstrate the reproducibility of the response. We also obtain a direct comparison between SERRS and SERS by choosing two dyes, Cy5t and Cy3t, which are similar in structure but differ in their excitation maxima, such that one is resonant and the other non-resonant with our laser excitation. As expected, the resonant enhancement is found to be of the order of 10 3 over and above that for SERS. The net SERRS enhancements are shown to be of the order of 10 9 . We also find that the resonant enhancement profile of the different peaks for the chromophore follows the plasmonic resonance absorption spectrum obtained for the structured surface.

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Section: Resultsmentioning

confidence: 93%

Section: Preparation Of Structured Substratesmentioning

confidence: 99%

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Reproducible SERRS from structured gold surfaces

Mahajan

Baumberg

Russell

et al. 2007

Phys. Chem. Chem. Phys.

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“…Th e commercial potential has recently been shown for sensor applications of nanotemplated gold fi lms (structured as in Fig. 1d) as amplifying substrates for the surface-enhanced Raman scattering of molecules attached to them [2][3][4][5][6] . Such fabrication exemplifi es the cost benefi ts of nanotemplating: substrates can be produced at a thousandth of the price of top-down fabrication approaches.…”

Section: Commentarymentioning

confidence: 99%

Breaking the mould: Casting on the nanometre scale

Baumberg

2006

Nature Mater

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“…11 Enhancements as large as 10 7 have been reported in nanoparticle clusters, enabling, for example, Raman spectroscopy of single molecules. 12,13 Other than Raman spectroscopy, [14][15][16] this phenomenon has found applications in optical third-harmonic generation, [17][18][19] as well as in second-harmonic generation, [20][21][22][23][24][25][26] which is the subject of this paper. Nahata et al 23 demonstrated an ∼10 4 -fold increase in the efficiency of optical second-harmonic generation from concentric silver ring structures centered around a 200-nm aperture (bull's-eye structure) compared to a silver film with an unadorned aperture.…”

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confidence: 99%

Plasmon-Enhanced Second-Harmonic Generation from Ionic Self-Assembled Multilayer Films

et al. 2006

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We have demonstrated large enhancements of the effective second-order nonlinear susceptibility ( (2) ) of ionic self-assembled multilayer (ISAM) films, causing a film with just 3 bilayers to be optically equivalent to a 700−1000 bilayer film. This was accomplished by using nanosphere lithography to deposit silver nanoparticles on the ISAM film, tuning the geometry of the particles to make their plasmonic resonances overlap the frequency of optical excitation. An enhancement in the efficiency of second harmonic generation (SHG) by as much as 1600 times was observed. Even though this is already a large value, we suggest that further refinements of the techniques are expected to lead to additional enhancements of similar or larger magnitude.Second-order nonlinear optical (NLO) materials are at the heart of telecommunications devices such as electro-optic modulators and optical switches, and in lasers such as highpower green and blue solid-state lasers and optical parametric amplifiers.Conventional NLO materials generally consist of inorganic crystals such as KTP, LiTaO 3 , and LiNbO 3 . 1 While they are quite efficient, high-quality crystals of sufficient size are expensive and difficult to manufacture. Organic NLO materials provide an alternative with the potential to provide high nonlinear susceptibilities in an economical fabrication process. 2 NLO materials based on ionic self-assembled multilayer (ISAM) films are particularly promising because of the ease of tailoring noncentrosymmetric structures and the long-term stability. [3][4][5] These films are made by alternately immersing a substrate in two solutions, containing a polycation and a polyanion, respectively. If the substrate initially carries negative surface charges, dipping in the polycation solution will result in a nanoscale polymer layer selfassembled on the substrate, yielding a positively charged substrate. Subsequent dipping in the polyanion solution results in a second layer of the polyanion formed on top of the first layer. The process can be repeated as many times as desired, building up films to arbitrary thickness with nanoscale precision. ISAM films may have substantial (2) values, comparable to that of lithium niobate. 5 Various methods have been suggested to improve the effective (2) of these films by modifying their composition. 6,7 Here, we demonstrate a new approach to enhance the second-order NLO susceptibility by creating hybrid structures from ISAM films and noble metal nanoparticles. Nanoparticles made from noble metals such as silver or gold have recently attracted considerable attention due to their unusual optical properties which enable light to be controlled in unique new ways. [8][9][10] The interaction of light with the free electrons in such particles gives rise to collective oscillations of the conduction electrons at optical frequencies, known as localized surface plasmons resonances (LSPRs). When excited in this fashion, the particles act as nanoscale antennas, concentrating the electromagnetic (E-M) field into v...

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Angle-Resolved Surface-Enhanced Raman Scattering on Metallic Nanostructured Plasmonic Crystals

Cited by 254 publications

References 25 publications

Reproducible SERRS from structured gold surfaces

Reproducible SERRS from structured gold surfaces

Breaking the mould: Casting on the nanometre scale

Plasmon-Enhanced Second-Harmonic Generation from Ionic Self-Assembled Multilayer Films

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