In metal optics gold assumes a special status because of its practical importance in optoelectronic and nano-optical devices, role as model system for the study elementary electronic excitations that underlie interaction electromagnetic fields with metals. However, largely inconsistent values frequency dependence dielectric function describing optical response are found literature. We performed precise spectroscopic ellipsometry measurements on evaporated gold, template-stripped...

Self-assembled plasmonic nanoring cavity arrays are formed alongside the curvature of highly packed metallic nanosphere gratings. The sub-10-nm gap size is precisely tuned via atomic layer deposition and ordered produced over a cm-sized area. resulting hybrid nanostructure boosts coupling efficiency light into plasmons, shows an improved SERS detection limit. These substrates used for biological analyte, adenine, followed by concurrent localized surface plasmon resonance sensing. As service...

Inexpensive, reproducible, and high-throughput fabrication of nanometric apertures in metallic films can benefit many applications plasmonics, sensing, spectroscopy, lithography, imaging. Here we use template-stripping to pattern periodic nanohole arrays optically thick, smooth Ag with a silicon template made via nanoimprint lithography. is low-cost material good optical properties, but it suffers from poor chemical stability biocompatibility. However, thin silica shell encapsulating our...

We experimentally demonstrate dielectrophoretic concentration of biological analytes on the surface a gold nanohole array, which concurrently acts as nanoplasmonic sensor and gradient force generator. The combination nanohole-enhanced dielectrophoresis, electroosmosis, extraordinary optical transmission through periodic array enables real-time label-free detection analyte molecules in 5 μL droplet using concentrations low 1 pM within few minutes, is more than 1000 times faster purely...

With a template-stripping fabrication technique, we demonstrate the mass of high-quality, uniform, ultrasharp (10 nm) metallic probes suitable for single-molecule fluorescence imaging, tip-enhanced Raman spectroscopy (TERS), and other near-field imaging techniques. We achieve reproducible with sub-20-nm spatial resolution an enhancement in detected signal up to 200. Similar results are obtained TERS carbon nanotubes. show that large apex angle (70.5°) our pyramidal tip is well suited scatter...

We evaluate and compare the sensitivity of gold nanodisks on silica substrates nanoholes made in silica-supported films, two most common sensor structures used plasmonic biosensing. An alumina overcoat was applied by atomic layer deposition (ALD) to precisely control interfacial refractive index determine evanescent field decay length. The results are good agreement with analytical models biomolecular binding experiments for substrates. found that outperform thin dielectric coatings (<∼20...

We use template stripping to integrate metallic nanostructures onto flexible, stretchable, and rollable substrates. Using this approach, high-quality patterned metals that are replicated from reusable silicon templates can be directly transferred polydimethylsiloxane (PDMS) First we produce stretchable gold nanohole arrays show their optical transmission spectra modulated by mechanical stretching. Next fabricate of pyramids demonstrate a modulation the wavelength light resonantly scattered...

Solid-state quantum emitters, such as artificially engineered dots or naturally occurring defects in solids, are being investigated for applications ranging from information science and optoelectronics to biomedical imaging. Recently, these same systems have also been studied the perspective of nanoscale metrology. In this letter, we study near-field optical properties a diamond nanocrystal hosting single nitrogen vacancy center. We find that center is sensitive probe surrounding...

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTComposition Dependence of the Interaction Parameter in Isotopic Polymer BlendsJ. D. Londono, A. H. Narten, G. Wignall, K. Honnell, E. T. Hsieh, W. Johnson, and F. S. BatesCite this: Macromolecules 1994, 27, 10, 2864–2871Publication Date (Print):May 1, 1994Publication History Published online1 May 2002Published inissue 1 1994https://pubs.acs.org/doi/10.1021/ma00088a029https://doi.org/10.1021/ma00088a029research-articleACS PublicationsRequest reuse...

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTInvestigation of micelle structure by fluorine magnetic resonance. III. Effect organic additives on sodium 12,12,12-trifluorododecyl sulfate solutionsNorbert Muller and Timothy Walter JohnsonCite this: J. Phys. Chem. 1969, 73, 6, 2042–2046Publication Date (Print):June 1, 1969Publication History Published online1 May 2002Published inissue 1 June 1969https://pubs.acs.org/doi/10.1021/j100726a067https://doi.org/10.1021/j100726a067research-articleACS...

We present metallic nanohole arrays fabricated on suspended membranes as an optofluidic substrate. Millimeter-sized were using nanoimprint lithography. demonstrate refractive-index-based tuning of the optical spectra a sucrose solution for optimization SERS signal intensity, leading to Raman enhancement factor 107. Furthermore, compared dead-ended arrays, capable flow-through detection increased measured intensity by 50 times. For directed transport analytes, we novel methodology utilizing...

We demonstrate precise three-dimensional integration of smooth bumps, grooves, and apertures in optically thick metal films using template stripping. Patterned silicon wafers are used as high-quality, reusable templates. The heights or depths the metallic features controlled to within 2 nm, giving continuously tunable optical properties with sharp intense plasmonic resonances. Furthermore, we a pick-and-place stripping method situ, enabling versatile micromanipulation, imaging,...

Microarray technology has facilitated many powerful high-throughput studies in the fields of genetics and proteomics, among others. However, preparation microarrays composed cell-derived membranes with embedded receptors proven difficult. Here we describe a new method for forming synthetic lipid vesicles natural cell membranes. The is based upon assembly into recessed micro- nanowells using polydimethylsiloxane (PDMS) block as "squeegee." This used to assemble phospholipid arrays micrometer...

There are many potential sensing applications for Au nanorods due to a tunable localized surface plasmon resonance (LSPR) frequency that changes with aspect ratio. However, their application at high temperatures is limited shape change can take place well below the melting point of bulk Au, driven by reduction in energy. A method stabilizing provided here encapsulating them 15 nm capping layer yttria stabilized zirconia (YSZ). After annealing rods nominal dimensions 100 × 44 temperature 600...

Abstract The experimental observation of unusually sharp plasmon resonance peaks in periodic Ag nanohole arrays made using template stripping is reported. extraordinary optical transmission (EOT) peak associated with the surface polaritons at smooth Ag‐water interface shows a well‐defined Fano‐type profile linewidth below 10 nm wavelength around 700 nm. Notably, this and intense radiant (Q factor 71) obtained visible frequencies water normally incident illumination. This accomplished by...

We demonstrate the design, fabrication and characterization of a near-field plasmonic nanofocusing probe with hybrid tip-plus-aperture design. By combining template stripping focused ion beam lithography, variety aperture-based probes can be fabricated high optical performance. In particular, combination large transmission through C-shaped aperture aligned to sharp apex (<10 nm radius) template-stripped metallic pyramid allows efficient delivery light—via aperture—while providing nanometric...

Abstract A new plasmonic device architecture based on ultrasmooth metallic surfaces with buried nanostructures is presented. Using template‐stripping techniques, ultrathin gold films less than 5 Å surface roughness are optically coupled to an arbitrary arrangement of gratings, rings, and nanodots. As a prototypical example, linear gratings under 20 nm thick for biosensing The optical illumination collection completely decoupled from the microfluidic delivery liquid samples due backside,...

Nanofabricated metallic tips are at the core of important research in single-molecule imaging, near-field scanning optical microscopy, tip-enhanced Raman spectroscopy, as well potential commercial applications such heat-assisted magnetic recording. While challenging to fabricate, much progress has been made towards reliable production extremely sharp (10 nm) probes. In this review, various factors that go into design tips, their fabrication, packaging and system integration,...

Abstract The ability to precisely control the topography, roughness, and chemical properties of metallic nanostructures is crucial for applications in plasmonics, nanofluidics, electronics, biosensing. Here a simple method produce embedded nanoplasmonic devices that can generate tunable plasmonic fields on ultraflat surfaces demonstrated. Using template‐stripping technique, isolated nanodisks wires are optical epoxy, which capped with thin silica overlayer using atomic layer deposition. top...

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPreparation and Characterization of Some Derivatives Poly(ethylenimine)Timothy W. Johnson Irving M. KlotzCite this: Macromolecules 1974, 7, 2, 149–153Publication Date (Print):March 1, 1974Publication History Published online1 May 2002Published inissue 1 March 1974https://pubs.acs.org/doi/10.1021/ma60038a001https://doi.org/10.1021/ma60038a001research-articleACS PublicationsRequest reuse permissionsArticle Views411Altmetric-Citations42LEARN ABOUT...

We demonstrate a novel scheme for plasmonic nanofocusing with internally illuminated asymmetric metallic pyramidal tips using linearly polarized light. A wafer-scale array of sharp pyramids is fabricated via template stripping films different thicknesses on opposing pyramid facets. This structural asymmetry achieved through one-step angled metal deposition that does not require any additional lithography processing and when enables the generation plasmons Kretschmann-like coupling method...

Gradient fields of optical, magnetic, or electrical origin are widely used for the manipulation micro- and nanoscale objects. Among various device geometries to generate gradient forces, sharp metallic tips one most effective. Surface roughness asperities present on traditionally produced reduce trapping efficiencies limit plasmonic applications. Template-stripped, noble metal surfaces structures have sub-nm can overcome these limits. We developed a process using mix conductive dielectric...

We investigate thin Ag films incorporating plasmonic nanohole arrays as transparent conducting electrodes for organic photovoltaic cells. Plasmonic are fabricated using nanosphere lithography to create hexagonal over centimeter-sized areas. Devices constructed a nanopatterned anode show power conversion efficiencies that exceed those of devices on conventional indium-tin-oxide, independent light polarization. In comparison cells unpatterned Ag, the efficiency is noted double with patterning.