Use of the Extraordinary Infrared Transmission of Metallic Subwavelength Arrays To Study the Catalyzed Reaction of Methanol to Formaldehyde on Copper Oxide

Williams, Shaun M.; Rodriguez, Kenneth R.; Teeters-Kennedy, Shannon; Stafford, Amanda D.; Bishop, Sarah R.; Lincoln, Ushani K.; Coe, James V.

doi:10.1021/jp0489368

Cited by 69 publications

(61 citation statements)

References 41 publications

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“…This has made such arrays very promising in biochemical sensing applications [50][51][52]. In particular, arrays with asymmetric metal-dielectric interfaces on both sides, such as an air-metal-substrate system, provide improved sensitivity because the analytes (ε > 1) applied on the array not only replace air as a dielectric medium at the metal surface, but also easily fill up the hole cavities against the substrate.…”

Section: Dielectric Overlayer Effectmentioning

confidence: 99%

Resonant terahertz transmission in plasmonic arrays of subwavelength holes

Zhang

2008

Eur. Phys. J. Appl. Phys.

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Abstract.A review of transmission properties of two-dimensional plasmonic structures in the terahertz regime is presented. Resonant terahertz transmission was demonstrated in arrays of subwavelength holes patterned on both metals and semiconductors. The effects of hole shape, hole dimensions, dielectric function of metals, array film thickness, and a dielectric overlayer were investigated by the state-of-the-art terahertz spectroscopy modalities. Extraordinary terahertz transmission was demonstrated in arrays of subwavelength holes made even from Pb, a generally poor metal, and having optically thin thicknesses less than one-third of a skin depth. We also observed a direct transition of a surface plasmon resonance from a photonic crystal minimum in a photo-doped semiconductor array. According to the Fano model, transmission properties of such plasmonic arrays are characterized by two essential contributions: resonant excitation of surface plasmons and nonresonant direct transmission. Plasmonic structures will find fascinating applications in terahertz imaging, biomedical sensing, subwavelength terahertz spectroscopy, and integrated terahertz devices. PACS

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Section: Dielectric Overlayer Effectmentioning

confidence: 99%

Resonant terahertz transmission in plasmonic arrays of subwavelength holes

Zhang

2008

Eur. Phys. J. Appl. Phys.

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“…2 Notably, surface plasmon effects have been exploited in a variety of sensing applications. [8][9][10][11] Nanostructurebased plasmonic sensing has been achieved with nanohole arrays, 12,13 single nanometric holes, 14 nanoslit arrays, 15 and various grating-type and diffractive nanostructures. [16][17][18][19][20] The construction of nanostructured optical elements for plasmonic sensing can be achieved with a variety of processing techniques.…”

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confidence: 99%

Wavelength Tunable Surface Plasmon Resonance-Enhanced Optical Transmission Through a Chirped Diffraction Grating

2010

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We report the construction and testing of a chirped diffraction grating, which serves as a substrate for surface plasmon-enhanced optical transmission. This grating possesses a spatial variation in both pitch and amplitude along its surface. It was created by plasma oxidation of a curved poly(dimethoxysilane) sheet, which resulted in nonuniform buckling along the polymer surface. A goldcoated replica of this surface elicited an optical response that consisted of a series of narrow, enhanced transmission peaks spread over the visible spectrum. The location and magnitude of these transmission peaks varied along the surface of the grating and coincided with conditions where surface plasmons were excited in the gold film via coupling to one or more of the grating's diffracted orders. A series of measurements were carried out using optical diffraction, atomic force microscopy, and normal incidence optical transmission to compare the grating topology to the corresponding optical response. In addition, the impact of a thin dielectric coating on the transmission response was determined by depositing a thin silicon oxide film over the grating surface. After coating, wavelength shifts were observed in the transmission peaks, with the magnitude of the shifts being a function of the film thickness, the local grating structure, and the diffracted order associated with each peak. These results illustrate the ability of this surface to serve as an information-rich optical sensor whose properties can be tuned by control of the local grating topology.

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“…Recent reviews on different sensing modalities have also only explored a limited number of plasmonic materials and without seriously considering excitation conditions (14)(15)(16). Moreover, nontraditional plasmonic materials such as Cu and Al are desirable for electronic device applications, and catalytically active metals, including Pd (17) [and Cu (18)], are useful in monitoring surface reactions.…”

mentioning

confidence: 99%

Screening plasmonic materials using pyramidal gratings

Gao¹,

Henzie

Lee

et al. 2008

Proc. Natl. Acad. Sci. U.S.A.

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Surface plasmon polaritons (SPPs) are responsible for exotic optical phenomena, including negative refraction, surface enhanced Raman scattering, and nanoscale focusing of light. Although many materials support SPPs, the choice of metal for most applications has been based on traditional plasmonic materials (Ag, Au) because there have been no side-by-side comparisons of the different materials on well-defined, nanostructured surfaces. Here, we report a platform that not only enabled rapid screening of a wide range of metals under different excitation conditions and dielectric environments, but also identified new and unexpected materials for biosensing applications. Nanopyramidal gratings were used to generate plasmon dispersion diagrams for Al, Ag, Au, Cu, and Pd. Surprisingly, the SPP coupling efficiencies of Cu and Al exceeded widely used plasmonic materials under certain excitation conditions. Furthermore, grazing angle excitation led to the highest refractive index sensitivities (figure of merit >85) reported at optical frequencies because of extremely narrow SPP resonances (full-width-at-half-minimum <6 nm or 7 meV). Finally, our screening process revealed that Ag, with the highest sensitivity, was not necessarily the preferred material for detecting molecules. We discovered that Au and even Pd, a weak plasmonic material, showed comparable index shifts on formation of a protein monolayer.nanophotonics ͉ surface plasmon polariton ͉ dispersion diagrams ͉ chemical and biological sensing S urface plasmon polaritons (SPPs) are collective excitations of free electrons trapped at a metal/dielectric interface (1). In the form of SPPs, light can be manipulated at length scales exceeding the diffraction limit (2, 3), which has the potential to transform chemical and biological sensing (4-7), imaging (8-10), and optoelectronics (11-13). To accelerate progress in any area; however, it is critical that rational design play an increasingly important role in developing standards so that applications based on SPP-supporting materials are not selected based on history or availability, but because of their optimal properties. For example, the grand challenge in SPP-based sensing is to achieve single (bio)molecule selectivity and sensitivity, but there are few reports on how to optimize the geometry of the nanostructures or their materials composition for a wide range of chemical environments. Recent reviews on different sensing modalities have also only explored a limited number of plasmonic materials and without seriously considering excitation conditions (14-16). Moreover, nontraditional plasmonic materials such as Cu and Al are desirable for electronic device applications, and catalytically active metals, including Pd (17) [and Cu (18)], are useful in monitoring surface reactions.The frequency range over which SPP resonances exist is dominated by intrinsic materials properties. Specifically, interband transitions of the metal play a large role in determining the relative electric permittivity ( m ), which sets an upper l...

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Use of the Extraordinary Infrared Transmission of Metallic Subwavelength Arrays To Study the Catalyzed Reaction of Methanol to Formaldehyde on Copper Oxide

Cited by 69 publications

References 41 publications

Resonant terahertz transmission in plasmonic arrays of subwavelength holes

Resonant terahertz transmission in plasmonic arrays of subwavelength holes

Wavelength Tunable Surface Plasmon Resonance-Enhanced Optical Transmission Through a Chirped Diffraction Grating

Screening plasmonic materials using pyramidal gratings

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