Quantum size effect in two-photon excited luminescence from silver nanoparticles

Drachev, Vladimir P.; Khaliullin, Eldar N.; Kim, W.; Alzoubi, F. Y.; Rautian, S. G.; Safonov, V. P.; Armstrong, R. L.; Shalaev, Vladimir M.

doi:10.1103/physrevb.69.035318

Cited by 39 publications

(43 citation statements)

References 19 publications

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“…Additionally, metal nanoparticles are advantageous with the ability to tailor the absorption band by modifying the particle geometry (nanospheres, nanoshells, nanorods, nanostars) for specific applications. Both single-photon and multiphoton PL of metal nanoparticles have been shown to correlate strongly with their plasmon resonances [148,[151][152][153], and they have both been applied to biological imaging.…”

Section: Inherent Pl Emissionmentioning

confidence: 99%

“…Here, we focus on inherent nonlinear signals from the NSOM tip. It is found that, when a sharp gold tip is excited with 780 nm femtosecond pulses, nonlinear inherent PL, as well as SHG, is generated [152,168]. The inherent emission spans across the visible and NIR regions, forming a highly confined white-light continuum…”

Section: Near-field Imaging By Inherent Nonlinear Emissionsmentioning

confidence: 99%

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Nonlinear plasmonic imaging techniques and their biological applications

et al. 2016

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Nonlinear optics, when combined with microscopy, is known to provide advantages including novel contrast, deep tissue observation, and minimal invasiveness. In addition, special nonlinearities, such as switch on/off and saturation, can enhance the spatial resolution below the diffraction limit, revolutionizing the field of optical microscopy. These nonlinear imaging techniques are extremely useful for biological studies on various scales from molecules to cells to tissues. Nevertheless, in most cases, nonlinear optical interaction requires strong illumination, typically at least gigawatts per square centimeter intensity. Such strong illumination can cause significant phototoxicity or even photodamage to fragile biological samples. Therefore, it is highly desirable to find mechanisms that allow the reduction of illumination intensity. Surface plasmon, which is the collective oscillation of electrons in metal under light excitation, is capable of significantly enhancing the local field around the metal nanostructures and thus boosting up the efficiency of nonlinear optical interactions of the surrounding materials or of the metal itself. In this mini-review, we discuss the recent progress of plasmonics in nonlinear optical microscopy with a special focus on biological applications. The advancement of nonlinear imaging modalities (including incoherent/ coherent Raman scattering, two/three-photon luminescence, and second/third harmonic generations that have been amalgamated with plasmonics), as well as the novel subdiffraction limit imaging techniques based on nonlinear behaviors of plasmonic scattering, is addressed.

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Section: Inherent Pl Emissionmentioning

confidence: 99%

Section: Near-field Imaging By Inherent Nonlinear Emissionsmentioning

confidence: 99%

Nonlinear plasmonic imaging techniques and their biological applications

et al. 2016

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“…Metal nanoparticles are also capable of photoluminescence, which has been shown to correlate strongly with their welldefined plasmon resonances (10)(11)(12)(13)(14)(15)(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.…”

mentioning

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.

921

884

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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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“…The much weaker and broader band at longer wavelengths is from two-photon excitation induced luminescence of the Ag particles. [19][20][21][22] The emission spectrum in Fig. 1 can be empirically described by a nonlinear leastsquares fit using a sum of a squared Gaussian function for the 400 nm peak, as the SH intensity is expected to be proportional to the square of the Gaussian profile of the fundamental intensity and a Gaussian function for the two-photon luminescence.…”

mentioning

confidence: 99%