Mechanism of Prism-Coupled Scanning Tunneling Microscope Light Emission

Iida, Wataru; Ahamed, Jamal Uddin; Katano, Satoshi; Uehara, Yoshio

doi:10.7567/jjap.50.095201

Cited by 3 publications

(2 citation statements)

References 14 publications

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“…However, in the tip radius range above 70 nm for AgNP and 50 nm for Si, the peak intensity becomes suppressed. This is similarly seen in the previous result, i.e., the calculation of the STM-LE from the Au substrate with the W tip. ,, The tip size dependence observed in the radiation intensity is ascribed to the periphery effect; i.e., the part of light emitted from the tip–sample gap is blocked due to the presence of the STM tip. One can expect that the radiation intensity should be reduced with the tip radius above the certain critical value.…”

Section: Resultssupporting

confidence: 84%

Creation and Luminescence of a Single Silver Nanoparticle on Si(111) Investigated by Scanning Tunneling Microscopy

2016

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We have investigated the fabrication of a single silver nanoparticle (AgNP) on Si(111) at room temperature using scanning tunneling microscopy (STM), and the luminescence of individual AgNP has been studied by means of STM light emission (STM-LE) spectroscopy. Using the field evaporation method, we succeeded in creating two types of nanostructures, i.e., AgNP and the nanohole formed by the elimination of Si atoms, on the Si substrate. It was found that two different nanostructures can be created selectively by using the appropriate electric field. STM-LE spectra of AgNP and the Si substrate exhibit the broad peak appearing in the visible light region. The peak intensity increases as increasing the AgNP size, accompanying a slight shift of the peak position. Furthermore, the theoretical calculation based on the finite-difference time-domain (FDTD) method has been used to get an insight into the STM-LE from a single AgNP on the Si substrate.

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Section: Resultssupporting

confidence: 84%

Creation and Luminescence of a Single Silver Nanoparticle on Si(111) Investigated by Scanning Tunneling Microscopy

2016

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“…, interband transitions) or from the decay of an excited plasmon (Figure A). This mechanism was initially introduced to explain the excitation polarization-independent emission of Au nanorods with a spectral position, line shape, and emission polarization matching those of the DFS and has been supported by more recent studies. ,,,, Direct surface plasmon emission has also been proposed to be feasible and theoretically verified for the visible light emission from a scanning tunneling microscope probing silver films. , While a small blue shift between PL and DFS spectra was previously noted for Au nanorods, , it was mainly ignored as it could not be easily explained. However, the differences observed here in the PL and DFS spectra for the AuNS monomers and dimers (Figure ) are much more significant, as already mentioned above.…”

Section: Resultsmentioning

confidence: 97%

Photoluminescence of a Plasmonic Molecule

et al. 2015

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Photoluminescent Au nanoparticles are appealing for biosensing and bioimaging applications because of their non-photobleaching and non-photoblinking emission. The mechanism of one-photon photoluminescence from plasmonic nanostructures is still heavily debated though. Here, we report on the one-photon photoluminescence of strongly coupled 50 nm Au nanosphere dimers, the simplest plasmonic molecule.We observe emission from coupled plasmonic modes as revealed by single-particle photoluminescence spectra in comparison to correlated dark-field scattering spectroscopy.The photoluminescence quantum yield of the dimers is found to be surprisingly similar to the constituent monomers, suggesting that the increased local electric field of the dimer plays a minor role, in contradiction to several proposed mechanisms. Aided by electromagnetic simulations of scattering and absorption spectra, we conclude that our data are instead consistent with a multistep mechanism that involves the emission due to radiative decay of surface plasmons generated from excited electronÀhole pairs following interband absorption.

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