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Topic: Surface plasmon

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	Plasmon - Wikipedia, the free encyclopedia
		In physics, the plasmon is the quasiparticle resulting from the quantization of plasma oscillations, which are density waves of the charge carriers in a conducting medium such as a metal, semiconductor, or plasma.
		Plasmons are longitudinal excitations (strictly speaking, bulk plasmons are longitudinal waves, however surface plasmons have both longitudinal and transverse components).
		Surface plasmon resonance is used by biochemists to detect the presence of a molecule on a surface.
	en.wikipedia.org /wiki/Plasmon (297 words)

	SPR Pages - Surface Plasmon Resonancec (Site not responding. Last check: 2007-10-16)
		Surface Plasmon Resonance (SPR) is a physical process that can occur when plane-polarized light hits a metal film under total internal reflection conditions (1).
		Plasmons have a characteristic momentum defined by factors that include the nature of the conducting film and the properties of the medium on either side of the film.
		The surface plasmon resonance angle mainly depends on the properties of the metal film, the wavelength of the incident light and the refractive index of the media on either side of the metal film (1).
	home.hccnet.nl /ja.marquart/BasicSPR/BasicSpr01.htm (2075 words)

	Surface Plasmon Research Page (Site not responding. Last check: 2007-10-16)
		A surface plasmon (SP) is a collective excitation of the electrons at the interface between a conductor and an insulator.
		Surface plasmon phenomena crop up in a number of different scenarios: the energy loss of electrons propelled through thin metal foils; the colorful appearance of suspensions of small metallic particles; and the dips in the intensity of light reflected from metal coated diffraction gratings.
		Surface plasmons on a plane surface are non-radiative electromagnetic modes, that is, SPs cannot be generated directly by light nor can they decay spontaneously into photons.
	physics.mtsu.edu /~wmr/surfplas.htm (452 words)

	SLU Physics - Surface Plasmon Resonance on Aluminum, Silver and Gold Thin Films
		A surface plasmon is a charge density wave that occurs at an interface between a thin film and another medium.
		Surface plasmons occur whenever energy is incident upon a thin film The plasmon wave can be excited at the interface between a thin metal film and air or other non-metal medium with a positive dielectric sign.
		Surface plasmon resonance occurs when the energy from incident light is of just the right frequency and angle of incidence to couple its energy with the surface plasmon, so that no light is reflected from a normally reflective surface.
	it.stlawu.edu /~physics/stuff/student_projects/2004/fallesen.shtml (259 words)

	SPR (Site not responding. Last check: 2007-10-16)
		In the late sixties, optical excitation of surface plasmons by the method of attenuated total reflection was demonstrated by Kretschmann [2] and Otto [3].
		Surface Plasmon Resonance is an quantum optical-electrical phenomenon arising from the interaction of light with a metal surface.
		Surface plasmon resonance is a charge-density oscillation that may exist at the interface of two media with dielectric constants of opposite signs, for instance, a metal and a dielectric.
	chem.ch.huji.ac.il /~eugeniik/spr.htm (3027 words)

	Campbell Group: Surface Plasmon Resonance (Site not responding. Last check: 2007-10-16)
		Surface Plasmon Resonance (SPR) based sensors are constructed from a transparent optical substrate with a thin metal film, typically Au.
		This coupling is observed as a sharp attenuation in reflectivity and is known as the surface plasmon resonance effect.
		Projects vary from the adsorption of various alkylthiols on Au, adsorption of streptavidin on biotinylated surfaces and subsequent adsorption of various biotinylated proteins and lipid vesicles onto the immobilized streptavidin, adsorption of hydroxyapatite on functionalized surfaces, and adsorption due to antibody/antigen, lipid-enzyme, DNA-DNA and protein-DNA interactions.
	www.cpac.washington.edu /~campbell/projects/spr.html (269 words)

	World Intellectual Property Organization (Site not responding. Last check: 2007-10-16)
		The amount of coupling, and thus the intensity of the plasmon, is determined by the incident angle of the light beam and is directly affected by the refractive indices of the materials on both sides of the metal film.
		The surface of the metal film forms the transduction mechanism for the SPR device and is brought into contact with the sample material to be sensed at the interface between the metal film and the emerging medium contained in a cell assembly.
		For a surface wave to be confined to the metal surface, the admittance exhibited by -the adjoining medium must be positive imaginary and of magnitude very close to that of the extinction coefficient k of the metal (i.
	www.wipo.int /ipdl/IPDL-CIMAGES/view/pct/getbykey5?KEY=01/88509.011122&ELEMENT_SET=DECL (7934 words)

	Bio-Strategy Distribution - Surface plasmon resonance (Site not responding. Last check: 2007-10-16)
		Surface plasmon resonance (SPR) allows sensitive detection of molecular interactions in real time, without the use of labels.
		Surface plasmon resonance (SPR) arises when light is reflected under certain conditions from a conducting film at the interface between two media of different refractive index.
		The exact conversion factor between RU and surface concentration depends on properties of the sensor surface and the nature of the molecule responsible for the concentration change.
	www.bio-strategy.com /Index.cfm?PID=113 (384 words)

	Resolution in Surface Plasmon Microscopy (Site not responding. Last check: 2007-10-16)
		Surface Plasmon decay lengths are determined theoretically and experimentally, for wavelengths ranging from 531 to 676 nm, and are in good agreement.
		The plasmon decay length is very dependent on the imaginary part of the dielectric function of the gold, which depends on the manufacturing process and surface roughness as well.
		Surface plasmon decay lengths were calculated from the determined dielectric function and observed with the surface plasmon microscope.
	www.lps.ens.fr /~berger/articles/art1/RevSci.htm (4335 words)

	Surface Plasmon Photonics (Site not responding. Last check: 2007-10-16)
		Surface plasmons are set to become part of the photonics revolution in which the interaction between light and matter is controlled by producing patterned structures that are periodic on the scale of the wavelength of light.
		Surface plasmons open up a wealth of new possibilities for photonics because they allow the concentration and propagation of light below the usual resolution limit, thus opening up such possibilities as sub-wavelength optical components.
		In particular, the damping of surface plasmons by absorption in the metal is usually considered to be serious enough to prevent practical exploitation.
	newton.ex.ac.uk /research/emag/surface (337 words)

	High Resolution Surface Plasmon Resonance Spectroscopy (Site not responding. Last check: 2007-10-16)
		Surface Plasmon Resonance (SPR) technique has emerged as a powerful technique for a variety of chemical and biological sensor applications.
		Surface plasmons are collective oscillations of free electrons in a metallic film.
		Under an appropriate condition, the plasmons can be set to resonate with light, which results in the absorption of light.
	www.public.asu.edu /~ntao1/SPR.htm (184 words)

	Surface Plasmon Homesite, Prague (Site not responding. Last check: 2007-10-16)
		J. Homola: On the sensitivity of surface plasmon resonance sensors with spectral interrogation, Sensors and Actuators B 41, 207 - 211 (1997).
		R. Slavík, J. Homola, J. Čtyroký: Miniaturization of fiber optic surface plasmon resonance sensor, Sensors and Actuators B 51, 311-315 (1998).
		Ctyroky, Surface plasmon resonance sensor based on a single-mode polarization-maintaining optical fiber, Sensors and Actuators B, 90, 236242 (2003).
	plazmon.ure.cas.cz /pub.shtml (2726 words)

	Surface Plasmon Resonance Publications - Georgiadis Group
		"Electrostatic surface plasmon resonance: Direct electric field-induced hybridization and denaturation in monolayer nucleic acid films and label-free discrimination of base mismatches", Richard J. Heaton, Alexander W. Peterson and Rosina M. Georgiadis, (Proc Natl Acad Sci U S A. "Kinetic control of hybridization in surface immobilized DNA monolayer films", Peterson AW, Heaton RJ, Georgiadis R,(J. Am.
		"Surface plasmon resonance spectroscopy as a probe of in-plane polymerization in monolayer organic conducting films",Georgiadis R, et al.
		"In situ kinetics of self-assembly by surface plasmon resonance spectroscopy", K. Peterlinz and R. Georgiadis, (Langmuir, 12, 4731-4740 (1996).
	people.bu.edu /rgeorgia/papers.htm (277 words)

	Fluorescence Detection Gains in Sensitivity - Surface-plasmon-coupled emission shows promise to expand its chemical and ...
		Surface plasmons are basically electron oscillations on the surface of metals -- or, more specifically, in an interfacial region between a metal and a dielectric medium.
		Although usually nonradiative, they are the basis of surface plasmon resonance.
		This process, which is used to measure bioaffinity reactions, occurs when irradiation with photons excites the surface plasmons on the metal to radiate in a measurable way.
	www.photonics.com /spectra/features/read.asp?artabid=745 (263 words)

	Surface plasmon resonance (Site not responding. Last check: 2007-10-16)
		Surface plasmon resonance is a detection technology applied in biosensors
		Surface plasmon resonance biosensor technique was used to study the...
		Evaluation of absorption of heparin-DOCA conjugates on the intestinal wall using a surface plasmon resonance.
	www.biosensor.co.uk /Surface_plasmon_resonance.html (544 words)

	Terahertz surface plasmon polariton coupling on metallic gratings
		Terahertz time-domain spectroscopy is used to study the nature and efficiency of coupling between surface plasmon polaritons and free-space terahertz radiation by metallic gratings made from brass rods and a grooved aluminum plate.
		Saxler, J. G´omez-Rivas, C. Janke, H. Pellemans, P. Haring-Bol´ıvar, and H. Kurz, “Time-domain measurements of surface plasmon polaritons in the terahertz frequency range,” Phys.
		Raether, Surface Plasmons on Smooth and Rough Surfaces and on Gratings (Springer-Verlag, Berlin, 1988).
	www.opticsexpress.org /abstract.cfm?URI=OPEX-12-25-6397 (245 words)

	Journal S&A 54 1-2
		Surface plasmon resonance interferometry for biological and chemical sensing
		Surface plasmon resonance bio- and chemical sensors with phase-polarisation contrast
		Surface plasmon resonance measurement of binding and dissociation of wild-type and mutant streptavidin on mixed biotin-containing alkylthiolate monolayers, Jung, Linda S.
	www.sensorsportal.com /HTML/CHEMICAL/SA_54_1_2.htm (224 words)

	Direct observation of surface plasmon-polariton dispersion
		We describe a method to observe the directional emission of electromagnetic radiation produced by the radiative decay of surface plasmonpolaritons (SPPs) that allows the dispersion of the modes in k-space to be directly visualized.
		As an example we show the formation of a stop-band for SPPs when the metal surface is modulated in the form of a diffraction grating.
		Murray, S. Astilean, and W. Barnes, “Transition from localized surface plasmon resonance to extended surface plasmon-polariton as metallic nanoparticles merge to form a periodic hole array,” Phys.
	www.opticsexpress.org /abstract.cfm?URI=OPEX-13-2-428 (382 words)

	Surface Plasmon Resonance (Site not responding. Last check: 2007-10-16)
		The surface plasmon (SP) wave on the gold surface is modulated from the dielectric constant of the thin gold film and the dielectric constant of the molecules adsorbed on the surface and within 200-300nm away of the surface.
		The position of the minima is indicative of the chemistry on the surface.
		The shift for the minimum wavelength is a measure of the dielectric constant or refractive index change on the gold surface.
	www.public.asu.edu /~booksh/spr2.htm (587 words)

	Physics News Graphics: Surface Plasmon Molecules
		In the plasmon molecule something analogous occurs: if the two metal surfaces were very far apart, there would be two isolated surface plasmons.
		Two separate cases are shown in (a) and (b), corresponding to the two different plasmon molecule levels: the symmetric (b) and antisymmetric (a) linear combination of surface plasmons at both interfaces.
		It is also worth noticing the huge enhancement of the fields at the surfaces, by a factor of order 500 in intensity, due to the plasmons.
	www.aip.org /mgr/png/2001/113.htm (431 words)

	Institut de Biologie structurale - Biacore’s Surface Plasmon Resonance technology
		In a Biacore experiment, one of the interacting molecule is bound to the biosensor surface (sensor chip), whereas the other is delivered to the surface in a continuous flow through a microfluidic system.
		Binding to the immobilized molecule is followed by surface plasmon resonance, which detects the mass concentrations at the surface.
		The response is directly proportional to the mass of molecules that bind to the surface.
	www.ibs.fr /content/ibs_eng/presentation/Platform/Facilities/biacore.htm (307 words)

	Biacore Surface Plasmon Resonance (SPR)
		SPR - Surface plasmon resonance is a phenomenon which occurs when light is reflected off thin metal films.
		The line projected at t1 corresponds to the situation before binding of antigens to the antibodies on the surface and t2 is the position of resonance after binding.
		"Quantitation of the E. coli methionine repressor-operator interaction by surface plasmon resonance is not affected by the presence of a dextran matrix." (1997)
	www.astbury.leeds.ac.uk /Facil/SPR/spr_intro2004.htm (1017 words)

	Nomadics Inc \| Site Style
		Spreeta utilizes the ultrasensitive physical principle known as surface plasmon resonance (SPR) to measure the refractive index (RI) of liquids that come into contact with the sensing surface.
		Surface plasmon resonance sensors have been demonstrated to measure properties such as:
		The evaluation modules are designed to allow users to experiment with surface plasmon resonance technology in a wide variety of applications for developing Spreeta-based field-portable and in-process instruments.
	www.aigproducts.com /surface_plasmon_resonance/spr.htm (259 words)

	CONDENSED MATTER AND SURFACE PHYSICS
		We apply different surface analytical techniques to investigate the films, ranging from in-situ ion scattering for depth profiling to ex-situ microscopic techniques such as shown in the figure.
		At present we are actively studying surface plasmon polaritons, and we intend to develop a device for detecting signals coming from physical and chemical changes induced by small amounts of certain chemical species.
		Fundamental theories for the excitations and for other dynamical properties of surfaces are being developed using the formalisms of many-body theory and quantum field theory, including Green functions and Feynman diagrams.
	www.physics.uwo.ca /research/condensed (2395 words)

	Surface-Plasmon-Enhanced Random Laser Demonstrated - February, 2005 (Site not responding. Last check: 2007-10-16)
		The surface plasmon enhancement of both scattering and electromagnetic fields caused by the 55-nm-diameter particles in a solution of rhodamine 6G enables lasing at a low-threshold pump energy fluence.
		The plasmonic silver-scatterer-based random laser, however, can function even in a regime where single scattering events are rare.
		A plasmonic random laser also could be used for sensing applications as a result of the dependence of surface plasmon behavior on the environmental conditions surrounding the particle.
	photonics.com /spectra/research/XQ/ASP/preaid.223/.../QX/read.htm (435 words)

	Surface Plasmon Resonance-BIAcore
		Surface plasmon resonance (SPR) is an optical phenomenon that is used to measure changes in the solution concentration of molecules at a biospecific surface.
		The interacting protein of interest is injected over the surface and the kinetics of binding are measured in real time.
		The equilibrium binding of proteins the biospecific surface at steady state to can be measured to obtain values of KD.
	www.med.unc.edu /wrkunits/2depts/biochem/MACINFAC/biacore.html (437 words)

	Energy Citations Database (ECD) - Energy and Energy-Related Bibliographic Citations
		The effects of the electronic band structure of Hg can be seen in the energy and width of the surface plasmon as a function of momentum transfer{ital q}{sub{parallel}}.
		These effects are shown to lead to an overall lowering of the plasma frequency, to a flattening of the momentum dispersion, and to sizable broadening of the plasmon line width relative to the behavior obtained for the simple metals.
		Even though the band structure effects in Hg are significant, there is a quantitative correlation between the normalized energy and width of the surface plasmon as a function of{ital q}{sub{parallel}} and the Mie resonance seen in Hg clusters as a function of the inverse of the radius{ital R}.
	www.osti.gov /energycitations/product.biblio.jsp?osti_id=112977 (284 words)

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