Surface picosecond raman gain spectroscopy of a cyanide monolayer on silver

Bergman, J. G.; Pinczuk, A.; Worlock, J. M.

doi:10.1016/0009-2614(79)85152-0

Cited by 125 publications

(50 citation statements)

References 8 publications

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“…The only possible alternative explanation we could consider is hot luminescence. To our knowledge there is one very important result obtained by Heritage et al [13] with surface picosecond Raman gain techniques, applied to a monolayer of CNon a silver surface. They measure a relaxation time of 200 ps for the continuous background observed together with the CN-SERS line.…”

Section: Discussionmentioning

confidence: 93%

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The Continuous Background of SERS from Ag Colloids in Alkali Halide Crystals

Abel

Fischer

1991

Physica Status Solidi (b)

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The continuum background of the SERS spectrum from thermally or photochemically prepared Ag colloids in alkali halide crystals is studied from − 5000 to + 1400 cm−1 and for counting rates covering three decades. The Stokes side consists of three contributions extending to about − 1500, − 3800, and beyond − 5000 cm−1 for 488 nm exciting light. As long as there is no evidence for hot luminescence it may be interpreted as SERS caused by charge‐transfer from the Fermi sea of the silver to mobility states and band‐tail states of the host and to localized surface states of the colloid. The anti‐Stokes intensity of the continuum background is found to follow a Boltzmann law between room temperature and 80 K.

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Section: Discussionmentioning

confidence: 93%

“…Further we have to remember the early papers of Mooradian [12] and of Heritage et al [13] which have shown that the continuum observed by them must be luminescence because of a detected time delay. Unfortunately we lack of time-resolved data of this background in our case.…”

Section: Introductionmentioning

confidence: 97%

The Continuous Background of SERS from Ag Colloids in Alkali Halide Crystals

Abel

Fischer

1991

Physica Status Solidi (b)

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“…Photoluminescence from bulk copper and gold was first observed by Mooradian (68) and has been used extensively in characterizing the carrier relaxation and the band structure of metals (69)(70)(71)(72)(73)(74). It was found that the emission peak was centered near the interband absorption edge of the metal and therefore was attributed to direct radiative recombination of the excited electrons with holes in the d-band.…”

Section: Enhanced Luminescence Properties Of Metal Nanoparticlesmentioning

confidence: 99%

Optical Properties and Ultrafast Dynamics of Metallic Nanocrystals

Link¹,

El‐Sayed

2003

Annu. Rev. Phys. Chem.

1,498

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Noble metal particles have long fascinated scientists because of their intense color, which led to their application in stained glass windows as early as the Middle Ages. The recent resurrection of colloidal and cluster chemistry has brought about the strive for new materials that allow a bottoms-up approach of building improved and new devices with nanoparticles or artificial atoms. In this review, we discuss some of the properties of individual and some assembled metallic nanoparticles with a focus on their interaction with cw and pulsed laser light of different energies. The potential application of the plasmon resonance as sensors is discussed.

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“…in vivo imaging ͉ plasmon resonance ͉ multiphoton ͉ nonlinear optics P hotoluminescence from noble metals was first reported in 1969 by Mooradian (1) and later observed as a broad background in surface-enhanced Raman scattering (2). Singlephoton luminescence from metals has been described as a three-step process as follows: (i) excitation of electrons from the d-to the sp-band to generate electron-hole pairs, (ii) scattering of electrons and holes on the picosecond timescale with partial energy transfer to the phonon lattice, and (iii) electron-hole recombination resulting in photon emission (1).…”

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confidence: 99%

In vitro and in vivo two-photon luminescence imaging of single gold nanorods

Wang

Huff

Zweifel

et al. 2005

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

918

883

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Gold nanorods excited at 830 nm on a far-field laser-scanning microscope produced strong two-photon luminescence (TPL) intensities, with a cos 4 dependence on the incident polarization. The TPL excitation spectrum can be superimposed onto the longitudinal plasmon band, indicating a plasmon-enhanced two-photon absorption cross section. The TPL signal from a single nanorod is 58 times that of the two-photon fluorescence signal from a single rhodamine molecule. The application of gold nanorods as TPL imaging agents is demonstrated by in vivo imaging of single nanorods flowing in mouse ear blood vessels.in vivo imaging ͉ plasmon resonance ͉ multiphoton ͉ nonlinear optics P hotoluminescence from noble metals was first reported in 1969 by Mooradian (1) and later observed as a broad background in surface-enhanced Raman scattering (2). Singlephoton luminescence from metals has been described as a three-step process as follows: (i) excitation of electrons from the d-to the sp-band to generate electron-hole pairs, (ii) scattering of electrons and holes on the picosecond timescale with partial energy transfer to the phonon lattice, and (iii) electron-hole recombination resulting in photon emission (1). Two-photon luminescence (TPL) was characterized by Boyd et al. (3) and is considered to be produced by a similar mechanism as singlephoton luminescence, but the relatively weak TPL signal can be amplified by several orders of magnitude when produced from roughened metal substrates. This amplification is due to a resonant coupling with localized surface plasmons, which are well known to enhance a variety of linear and nonlinear optical properties (4-9).Metal nanoparticles are also capable of photoluminescence, which has been shown to correlate strongly with their welldefined plasmon resonances (10-16). For example, Mohamed et al. (11) have observed that the quantum efficiency of singlephoton luminescence from gold nanorods is enhanced by a factor of Ͼ1 million under plasmon-resonant conditions. Plasmonresonant TPL is attractive for nonlinear optical imaging of biological samples with 3D spatial resolution (17). Gold nanorods are particularly appealing as TPL substrates because their longitudinal plasmon modes are resonant at near-infrared, where the absorption of water and biological molecules are minimized. Moreover, nanorods have larger local field enhancement factors than nanoparticles due to reduced plasmon damping (18). A scanning near-field optical microscopy study of TPL from single nanorods (diameter Ϸ 40 nm) has recently been reported by Imura et al. (16), who observed that the luminescence is greatest at their tips. However, further characterization of TPL from single gold nanorods is needed: the polarization dependence of TPL excitation and emission from nanorods has yet to be defined, as well as the relationship between TPL enhancement and the longitudinal and transverse plasmon modes. These studies can provide a deeper understanding of single-particle TPL and its potential application in nonlinear optical imag...

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Surface picosecond raman gain spectroscopy of a cyanide monolayer on silver

Cited by 125 publications

References 8 publications

The Continuous Background of SERS from Ag Colloids in Alkali Halide Crystals

The Continuous Background of SERS from Ag Colloids in Alkali Halide Crystals

Optical Properties and Ultrafast Dynamics of Metallic Nanocrystals

In vitro and in vivo two-photon luminescence imaging of single gold nanorods

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