The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
We formed titania nanotube arrays containing partially embedded gold nanoparticles which exhibit extremely strong localized surface plasmon resonances (LSPR) characterized by a strong extinction coefficient and a high Q-factor. Such 3D plasmonic nanocomposites were formed by first vacuum depositing a multilayer thin film stack consisting of alternating layers of sputtered Ti and co-sputtered Ti-Au...
We present two novel SERS substrates which allow easily achievable sub-10 nm gaps — ‘Nanoparticles inside Nanolines’ and ‘Nanofingers inside Nanowires’. Theoretical studies based on Finite Difference Time Domain (FDTD) modelling as well as large-are fabrication methodologies for developing these substrates are discussed.
Thin-film photovoltaic (PV) cell technology has been of keen interest over the last decade or so due to its lower cost of production, wide applicability and lower diffusion length for minority carriers. However, the conversion efficiencies of thin-film PV cells is much lower than that of conventional crystalline Si PV cells. Nanostructures have therefore been designed and implemented with such cells...
Photovoltaic (PV) cells are important devices that can be used to convert photons into electrical energy. However, the cost of current PV devices needs to be significantly reduced and their efficiencies need to be substantially enhanced to enable large scale implementation of PV cells as sources of clean electrical energy. Surface plasmon polaritrons (SPP) in metallic nanostructures in close proximity...
Metallic nanostructures supporting Localized Surface Plasmons (LSP) are characterized by their unique ability to control and manipulate light at the nanoscale. The excitation of the surface plasmon modes may also affect the magneto-optical (MO) response of metal nanostructures. Such modulated MO signal can represent a novel sensing probe for detection of bulk refractive index changes at metal/dielectric...
Three-dimensional patterning of gold nano-particles on SiO2 and Si substrates is performed by ion-beam lithography with 15–20 nm resolution. Realization of an on-demand achiral and chiral modifications of nano-structures are demonstrated. Simulations of optical properties of the obtained nano-architectures reveal the possibility to tailor the field enhancement both in the spatial and spectral domains,...
We present near-field optical properties around silicon and gold nanoparticles aligned on a silicon substrate excited by oblique incidence femtosecond laser for nanohole processing. Near-field nanofabrication will open up smart applications for new optical devices with high-throughput processing. The near field around silicon and gold particles is explained by Mie scattering theory, while the near...
The fast and sensitive detections of chemicals adsorption onto solid substrates are of importance to many fields. Ordered arrays of gold nanoparticles with strong surface plasmon resonances allow directly visualized detection of molecular scale adsorptions of mercury vapor on solid substrates. The adsorbed species change local dielectric constants surrounding plasmonic nanoparticles, leading to shifts...
In the present study, we report on the surface plasmon resonance (SPR) engineering of gold nanoparticles by off-axis pulsed laser deposition (PLD) technique. The variation in SPR with laser energy and substrate to target distance is systematically studied using UV-visible spectroscopic technique. The SPR is found to be sensitive to laser energy and substrate to target distance which is clearly evident...
Gold nanoparticles (AuNP) continue rising a strong interest for research and especially in the field of biosensors as attested by growing number of publications. One reason is that AuNP exhibit an optical response dominated by the localised surface plasmon resonance (LSPR) that is highly sensitive to the molecular environment. This paper describes the preparation of monodisperse supported AuNP and...
In this work, the authors present a method for analyzing field enhancement in dense, disordered, semiconductor nanowire forests coated in noble metal nanoparticles using the volume integral equation. A hybrid fast solver employing the fast multipole method (FMM) and accelerated Cartesian expansions (ACE) is utilized to rapidly solve for fields in geometries which would otherwise be computationally...
In this work, we investigate the effects produced on the light absorption and scattering by silver nanoparticles, arranged in a periodic pattern, placed on the top of amorphous thin silicon (α-Si) layer. Solar conversion efficiency in thin film solar cells can be enhanced exploiting surface plasmon (SP) waves and resonances. The deposition of metal nanoparticles layers on the top of a thin film silicon...
We design and fabricate a-Si:H solar cells with plasmonic crystal back reflectors demonstrating enhanced absorption of near infrared photons. Rigorous simulations predict plasmonic nanoparticles on ITO can increase absorption in the near infrared. Rigorous simulations also predict plasmonic crystal back reflectors with a pitch of ~750 nm to optimize the enhanced absorption. Such periodic back reflectors...
We present a new class of plasmonic substrates where silver nanoparticles are impregnated into a polycarbonate host. The substrates are shown to be exceptional candidates for SERS and metal enhanced fluorescence applications.
The nanoparticles redistribution in a microfluidic channel through a dynamic patterning process will locally change the refractive index of the medium around the nanodisk arrays, as well as the LSPR. The dynamic patterning of nanoparticles was achieved by a standing surface acoustic wave (SSAW), from which the acoustic force generated and force the particles to the pressure nodes. The SSAW were formed...
This paper provides an overview of the development and applications of plasmonics-active nanoprobes in biomedical diagnostics. Specific examples of detection techniques using surface-enhanced Raman scattering are presented to illustrate the usefulness and potential of the plasmonics nanoprobes for gene detection and nanobiosensing. The detection of specific target deoxyribonucleic acids sequences...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.