Topic
Surface plasmon resonance
About: Surface plasmon resonance is a research topic. Over the lifetime, 24909 publications have been published within this topic receiving 810976 citations. The topic is also known as: Surface plasmon resonance & SPR (technology).
Papers published on a yearly basis
Papers
More filters
TL;DR: This work discusses and describes the fundamentals of optical forces in the context of plasmonic nanoparticles, including effects of polarization, optical angular momentum, and laser heating effects, as well as the various techniques that have been used to trap and manipulate metal nanoparticles.
Abstract: Optical trapping using focused laser beams (laser tweezers) has been proven to be extremely useful for contactless manipulation of a variety of small objects, including biological cells, organelles within cells, and a wide range of other dielectric micro- and nano-objects. Colloidal metal nanoparticles have drawn increasing attention in the field of optical trapping because of their unique interactions with electromagnetic radiation, caused by surface plasmon resonance effects, enabling a large number of nano-optical applications of high current interest. Here we try to give a comprehensive overview of the field of laser trapping and manipulation of metal nanoparticles based on results reported in the recent literature. We also discuss and describe the fundamentals of optical forces in the context of plasmonic nanoparticles, including effects of polarization, optical angular momentum, and laser heating effects, as well as the various techniques that have been used to trap and manipulate metal nanoparticles. We conclude by suggesting possible directions for future research.
203 citations
TL;DR: A simple setup for generating evanescent Bessel beams is proposed, where the entire beam is p-polarized with respect to the dielectric-metal interface, enabling excitation of surface plasmons from all directions.
Abstract: A simple setup for generating evanescent Bessel beams is proposed. When a radially polarized beam is strongly focused onto a dielectric-metal interface, the entire beam is p-polarized with respect to the dielectric-metal interface, enabling excitation of surface plasmons from all directions. The angular selectivity of surface plasmon excitation mimics the function of an axicon, leading to an evanescent nondiffracting Bessel beam. The created evanescent Bessel beam may be used as a virtual probe for near-field optical imaging and sensing applications.
202 citations
TL;DR: In this paper, Azobenzene-derivatized alkanethiols have been used to form self-assembled monolayers on planar and colloidal gold substrates.
Abstract: Azobenzene-derivatized alkanethiols have been used to form self-assembled monolayers on planar and colloidal gold substrates. Five derivatives were used allowing investigation of the effects of chain length, ω-functionality and a comparison of thiol versus disulfide. Single-component monolayer films, i.e., consisting only of the “azo”-derivatized thiols (disulfides), showed no evidence of photoswitching. However, “photoswitching” was observed in “mixed monolayers”, in self-assembled multilayers, and on nanoparticles coated with mixed monolayers. The photoswitching was observed using surface plasmon resonance on the planar samples and by UV−vis spectroscopy from nanoparticle solutions.
202 citations
TL;DR: In this article, the plasmon resonance of nanostructured graphene was dynamically tuned to selectively probe the protein at different frequencies and extract its complex refractive index, and the extreme spatial light confinement in graphene, up to two orders of magnitude higher than in metals, produces an unprecedentedly high overlap with nanometric biomolecules, enabling superior sensitivity in the detection of their refractive indices and vibrational fingerprints.
Abstract: Infrared spectroscopy is the technique of choice for chemical identification of biomolecules through their vibrational fingerprints. However, infrared light interacts poorly with nanometric size molecules. Here, we exploit the unique electro-optical properties of graphene to demonstrate a high-sensitivity tunable plasmonic biosensor for chemically-specific label-free detection of protein monolayers. The plasmon resonance of nanostructured graphene is dynamically tuned to selectively probe the protein at different frequencies and extract its complex refractive index. Additionally, the extreme spatial light confinement in graphene, up to two orders of magnitude higher than in metals, produces an unprecedentedly high overlap with nanometric biomolecules, enabling superior sensitivity in the detection of their refractive index and vibrational fingerprints. The combination of tunable spectral selectivity and enhanced sensitivity of graphene opens exciting prospects for biosensing.
202 citations
TL;DR: In this paper, the plasmonic properties of gold nanoparticles were exploited for the photocatalytic degradation of methylene blue under visible (700 nm) and ultraviolet (250-380 nm) light.
Abstract: Researchers in Japan have developed a visible-light-driven photocatalyst by exploiting the plasmonic properties of gold nanoparticles. Francesca Pincella and co-workers fabricated the photocatalyst by depositing a two-dimensional array of gold nanoparticles on top of a transparent conductive substrate of indium-tin-oxide-coated quartz. They then covered the gold nanoparticles with a monolayer of trimethoxyoctylsilane, which acts as an anchoring agent for the final layer of titania nanocrystals. Experiments involving the photocatalytic breakdown of methylene blue under visible (700 nm) and ultraviolet (250–380 nm) light suggest that operation is considerably superior to that of conventional titania photocatalysts. The performance in the visible region is attributed to two-photon absorption, which is boosted by the plasmon resonance and near-field enhancement of the gold nanoparticles.
202 citations