Vibrationally Resolved Fluorescence from Organic Molecules near Metal Surfaces in a Scanning Tunneling Microscope

Dong, Zhen‐Chao; Guo, Xinli; Trifonov, A. S.; Dorozhkin, Pavel; Miki, Kazushi; Kimura, Kaname; Yokoyama, Shiyoshi; Mashiko, Shinro

doi:10.1103/physrevlett.92.086801

Cited by 221 publications

(226 citation statements)

References 28 publications

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“…Despite strong quenching effects, near-field optical image of target molecule with sufficiently high resolution could be realised by means of the local EM field excited at the metallic tip. The detailed fluorescence pattern and the position of target molecules can be determined with accuracy better than 1 nm experimentally and theoretically, as shown in Figure 15 [100]. Two years later, it is reported that a near-field optical image of single target molecules with sixfold improvement in the S/N ratio and sub-10 nm resolution was observed.…”

Section: The Tip-enhanced Effect Towards Fluorescence Emissionsmentioning

confidence: 84%

“…Similar on TERS, a new fluorescence technique, tip-enhanced fluorescence spectroscopy (TEFS), have been studied theoretically and experimentally recently [96][97][98][99][100][101]. With the combination of scanning probe microscopy (SPM), a very shape metallic SPM tip can generate a "hotspot" to strongly enhance several distinct photophysical sample responses including photo-induced light emission, electrically driven light emission and so on, as shown in Figure 12 [102].…”

Section: The Tip-enhanced Effect Towards Fluorescence Emissionsmentioning

confidence: 99%

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Recent Progress on Plasmon-Enhanced Fluorescence

et al. 2015

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Abstract:The optically generated collective electron density waves on metal-dielectric boundaries known as surface plasmons have been of great scientific interest since their discovery. Being electromagnetic waves on gold or silver nanoparticle's surface, localised surface plasmons (LSP) can strongly enhance the electromagnetic field. These strong electromagnetic fields near the metal surfaces have been used in various applications like surface enhanced spectroscopy (SES), plasmonic lithography, plasmonic trapping of particles, and plasmonic catalysis. Resonant coupling of LSPs to fluorophore can strongly enhance the emission intensity, the angular distribution, and the polarisation of the emitted radiation and even the speed of radiative decay, which is so-called plasmon enhanced fluorescence (PEF). As a result, more and more reports on surface-enhanced fluorescence have appeared, such as SPASER-s, plasmon assisted lasing, single molecule fluorescence measurements, surface plasmoncoupled emission (SPCE) in biological sensing, optical orbit designs etc. In this review, we focus on recent advanced reports on plasmon-enhanced fluorescence (PEF). First, the mechanism of PEF and early results of enhanced fluorescence observed by metal nanostructure will be introduced. Then, the enhanced substrates, including periodical and nonperiodical nanostructure, will be discussed and the most important factor of the spacer between molecule and surface and wavelength dependence on PEF is demonstrated. Finally, the recent progress of tipenhanced fluorescence and PEF from the rare-earth doped up-conversion (UC) and down-conversion (DC) nanoparticles (NPs) are also commented upon. This review provides an introduction to fundamentals of PEF, illustrates the current progress in the design of metallic nanostructures for efficient fluorescence signal amplification that utilises propagating and localised surface plasmons.

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Section: The Tip-enhanced Effect Towards Fluorescence Emissionsmentioning

confidence: 84%

Section: The Tip-enhanced Effect Towards Fluorescence Emissionsmentioning

confidence: 99%

Recent Progress on Plasmon-Enhanced Fluorescence

et al. 2015

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“…The former characteristic was found in the case of the light emission induced by the intramolecule radiative transition, in which the electrons tunneling from the tip or substrate induce radiative direct transitions between two orbitals of the molecule [12]. To clarify the origin of the peak at 720 nm, we performed visible light absorption spectroscopy (VAS) measurement.…”

Section: Resultsmentioning

confidence: 99%

Tunneling-Current-Induced Light Emission from Copper Phthalocyanine Thin Films

Uemura

Furumoto

Nakano

et al. 2006

e-J. Surf. Sci. Nanotechnol.

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Molecular fluorescence induced by tunneling electrons from a scanning tunneling microscope was investigated for copper phthalocyanine thin films deposited on the highly ordered pyrolytic graphite and the Au(111) substrates. No light emission was observed from the copper phthalocyanine thin films on the highly ordered pyrolytic graphite substrate, on the other hand, the fluorescence of copper phthalocyanine on the Au(111) substrate was observed with plasmon-mediated light emission related to the Au(111) substrate. These results are due to the differences in the charge injection efficiency and surface plasmon resonance mode of two substrates. The obtained fluorescence did not satisfy the quantum cutoff condition, that is, observed photon energy was higher than the energy of injected electrons.

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“…Recently, we demonstrated the generation of anomalous molecular electroluminescence, the so-called "forbidden light" by resonant plasmons that are highly confined inside a nanogap between metallic nanotip and metal substrate in a scanning tunneling microscope [14,15]. However, the quantum efficiency detected there is still quite low, on the order of 10 5 photons per electron.…”

mentioning

confidence: 99%

Optimization of nanocavity field enhancement using two-dimensional plasmonic photonic crystals

Xing

Dong

2012

Chin. Sci. Bull.

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We have investigated the influence of Ag nanorod radius (r) on the resonant modes of a two-dimensional plasmonic photonic crystal (PPC) with dipole sources embedded into the central vacancy area, using finite-difference time-domain methods. Both the localized surface plasmon (LSP) mode of individual Ag nanorods and the resonant cavity mode of PPC are found to vary as a function of r. The resonant cavity mode is strongly enhanced as r is increased, while the LSP signal will eventually become no longer discernable in the Fourier spectrum of the time-evolved field. An optimized condition for the nanocavity field enhancement is found for a given PPC periodicity (e.g. d = 375 nm) with the critical nanorod radius r c = d/3. At this point the resonant cavity mode has the strongest field enhancement, best field confinement and largest Q-factor. We attribute this to competition between the blocking of cavity confined light to radiate out when the cavity resonant frequency falls inside the opened photonic stopband as r reaches r c , and the transfer of cavity mode energy to inter-particle plasmons when r is further increased.plasmonic photonic crystal, finite-difference time-domain method, localized surface plasmon, Purcell factor Citation:Tao X, Dong Z C. Optimization of nanocavity field enhancement using two-dimensional plasmonic photonic crystals.

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Vibrationally Resolved Fluorescence from Organic Molecules near Metal Surfaces in a Scanning Tunneling Microscope

Cited by 221 publications

References 28 publications

Recent Progress on Plasmon-Enhanced Fluorescence

Recent Progress on Plasmon-Enhanced Fluorescence

Tunneling-Current-Induced Light Emission from Copper Phthalocyanine Thin Films

Optimization of nanocavity field enhancement using two-dimensional plasmonic photonic crystals

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