Simple and efficient scanning tunneling luminescence detection at low-temperature

Keizer, JG Joris; Garleff, JK Jens; Koenraad, PM Paul

doi:10.1063/1.3274675

Cited by 16 publications

(10 citation statements)

References 31 publications

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“…In this paper we have demonstrated that the radiative modes of a plasmonic nanocavity can be studied by a combination of STML and STS through a novel procedure that eliminates all the electronic-structure contributions to the measured far-field optical spectra. The method is based on the relationship between the rate of inelastic tunnelling events with energy loss ℎ at a bias voltage and the total tunnel current at a lower bias To collect the emitted light we modified the head of our STM following the procedure described in [37]. Our light detection set-up is formed by three lenses, one in UHV and two in air, three mirrors, and an optical spectrometer (Andor Shamrock 500) equipped with a Peltier Discussion on the normalization process…”

Section: Discussionmentioning

confidence: 99%

Unveiling the radiative local density of optical states of a plasmonic nanocavity by STM

et al. 2020

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Disentangling the contributions of radiative and non-radiative localized plasmonic modes from the photonic density of states of metallic nanocavities between atomically-sharp tips and flat substrates remains an experimental challenge nowadays. Electroluminescence due to tunnelling through the tip-substrate gap allows discerning solely the excitation of radiative modes, but this information is inherently convolved with that of the electronic structure of the system. In this work we present a fully experimental procedure to eliminate the electronicstructure factors from the scanning tunnelling microscope luminescence spectra by confronting them with spectroscopic information extracted from elastic current measurements. Comparison against electromagnetic calculations demonstrates that this procedure allows characterizing the meV shifts experienced by the dipolar and quadrupolar 2 plasmonic modes supported by the nanocavity under atomic-scale gap size changes. Our method, thus, gives us access to the frequency-dependent radiative Purcell enhancement that a microscopic light emitter would undergo when placed at the nanocavity.

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Section: Discussionmentioning

confidence: 99%

Unveiling the radiative local density of optical states of a plasmonic nanocavity by STM

et al. 2020

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“…The experiments were performed with an Omicron STM operating at 4.6 K in ultrahigh vacuum. The setup was adapted to light emission measurements following the design developed in [19]. In this setup a lens (fnumber = 1.5) is fixed to the STM head so that the tip-sample junction can be precisely located at the lens focal point.…”

mentioning

confidence: 99%

Electroluminescence of a Polythiophene Molecular Wire Suspended between a Metallic Surface and the Tip of a Scanning Tunneling Microscope

et al. 2014

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The electroluminescence of a polythiophene wire suspended between a metallic surface and the tip of a scanning tunneling microscope is reported. Under positive sample voltage, the spectral and voltage dependencies of the emitted light are consistent with the fluorescence of the wire junction mediated by localized plasmons. This emission is strongly attenuated for the opposite polarity. Both emission mechanism and polarity dependence are similar to what occurs in organic light emitting diodes (OLED) but at the level of a single molecular wire.

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“…1(b), it can already be seen by the dark rims around islands and substrate steps that the photon emission is significantly reduced when the STM tip is placed near a step edge. Such a reduced intensity at step edges has already been observed on other closely packed noble metal surfaces like Au(111) [22], Au(110) [23], Cu(111) [24], and Ag(111) [4,25,26], whereas on Au(110), enhanced emission was observed at step edges [5,27]. The effect was finally attributed by Hoffmann et al [5] to the local density of states (LDOS) at the step edge.…”

Section: A Step-edge Effectmentioning

confidence: 72%

Influence of Co bilayers and trilayers on the plasmon-driven light emission from Cu(111) in a scanning tunneling microscope

et al. 2020

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Light emission from the gap cavity formed by the tip of a scanning tunneling microscope (STM) and a flat metallic sample allows us to probe the dielectric response of metals at the atomic scale and presents a way to distinguish between different materials. The excitation mechanism of the charge carrier oscillations, which ultimately decay into light, is linked to inelastic electron tunneling as opposed to the mostly semiclassical picture of the electromagnetic resonance of the gap cavity. Thus, the observed light emission does not only reflect the electromagnetic resonance of the cavity but also involves the electronic density of states. In this paper, we compare light emission from Cu(111) and Co nanoislands on Cu(111). We find a strong intensity contrast but almost no alteration of the resonance wavelength except close to step edges. Our results show that the light emission from the STM junction is highly sensitive to a few atomic layers of alien material mostly due to the dielectric properties of the layer.

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Simple and efficient scanning tunneling luminescence detection at low-temperature

Cited by 16 publications

References 31 publications

Unveiling the radiative local density of optical states of a plasmonic nanocavity by STM

Unveiling the radiative local density of optical states of a plasmonic nanocavity by STM

Electroluminescence of a Polythiophene Molecular Wire Suspended between a Metallic Surface and the Tip of a Scanning Tunneling Microscope

Influence of Co bilayers and trilayers on the plasmon-driven light emission from Cu(111) in a scanning tunneling microscope

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