Temporal coherence of propagating surface plasmons

Wang, Tao; Comtet, G.; Moal, Eric Le; Dujardin, Gérald; Drezet, Aurélien; Huant, S.; Boer-Duchemin, Elizabeth

doi:10.1364/ol.39.006679

Cited by 21 publications

(16 citation statements)

References 15 publications

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“…However, in addition to loss of amplitude, an important factor that also needs to be taken into account is loss of coherence, both spatial and temporal [34]. In the classical regime, there have been many works that have investigated loss of coherence in plasmonic nanostructures and waveguides, both spatially [35][36][37][38] and temporally [39][40][41][42][43][44]. At the microscopic level, pure loss of coherence is due to elastic electron scattering processes that do not lead to the loss of energy from the plasmon oscillation [39,45].…”

Section: Introductionmentioning

confidence: 99%

Probing Decoherence in Plasmonic Waveguides in the Quantum Regime

et al. 2018

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We experimentally investigate the decoherence of single surface plasmon polaritons in metal stripe waveguides. In our study we use a Mach-Zehnder configuration previously considered for measuring decoherence in atomic, electronic and photonic systems. By placing waveguides of different length in one arm we are able to measure the amplitude damping time T1 = 1.90 ± 0.01 × 10 −14 s, pure phase damping time T * 2 = 11.19±4.89×10 −14 s and total phase damping time T2 = 2.83±0.32×10 −14 s. We find that decoherence is mainly due to amplitude damping, and thus loss arising from inelastic electron and photon scattering plays the most important role in the decoherence of plasmonic waveguides in the quantum regime. However, pure phase damping is not completely negligible. The results will be useful in the design of plasmonic waveguide systems for carrying out phase-sensitive quantum applications, such as quantum sensing. The probing techniques developed may also be applied to other plasmonic nanostructures, such as those used as nanoantennas, as unit cells in metamaterials and as nanotraps for cold atoms.

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Section: Introductionmentioning

confidence: 99%

Probing Decoherence in Plasmonic Waveguides in the Quantum Regime

et al. 2018

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“…We use bandpass filters to select narrow energy ranges within the visible and near-infrared spectrum (from emission wavelengths of 550-900 nm). Thus we record a series of spectrally filtered Fourier-space images [32,33]. To further resolve the spectral dependence of the angular emission pattern, we use configuration 2 of the setup, where the Fourier-space image is formed on the entrance slit of the spectrometer (this feature is new compared to the setup used in our previous publications).…”

Section: Experimental Methodsmentioning

confidence: 99%

Revealing the spectral response of a plasmonic lens using low-energy electrons

et al. 2017

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Plasmonic lenses, even of simple design, may have intricate spectral behavior. The spectral response of a plasmonic lens to a local, broadband excitation has rarely been studied despite its central importance in future applications. Here we use the unique combination of scanning tunneling microscopy (STM) and angle-resolved optical spectroscopy to probe the spectral response of a plasmonic lens. Such a lens consists of a series of concentric circular slits etched in a thick gold film. Spectrally broad, circular surface plasmon polariton (SPP) waves are electrically launched from the STM tip at the plasmonic lens center, and these waves scatter at the slits into a narrow, out-of-plane, light beam. We show that the angular distribution of the emitted light results from the interplay of the size of the plasmonic lens and the spectral width of the SPP nanosource. We then propose simple design rules for optimized light beaming with the smallest possible footprint. The spectral distribution of the emitted light depends not only on the SPP nanosource, but on the local density of electromagnetic states (EM-LDOS) at the nanosource position, which in turn depends on the cavity modes of the plasmonic microstructure. The key parameters for tailoring the spectral response of the plasmonic lens are the period of the slits forming the lens, the number of slits, and the lens inner diameter.

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“…This data gives insight into the energy distribution of the surface plasmon nanosource when the tip is made of tunsgten and the sample is made of gold (see also Refs. 18,19 ). This distribution exhibits a peak centered at about 700 nm (photon wavelength in vacuum).…”

Section: Effect Of the Plasmonic Lens Parametersmentioning

confidence: 99%

Using a plasmonic lens to control the emission of electrically excited light

et al. 2016

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International audienceA local, low-energy, electrical method for the excitation of localized and propagating surface plasmon polaritons (SPPs) is attractive for both fundamental and applied research. In particular, such a method produces no excitation background light and may be integrated with nanoelectronics. Here we report on the electrical excitation of SPPs through the inelastic tunneling of low-energy electrons from the tip of a scanning tunneling microscope (STM) to the surface of a two-dimensional plasmonic lens. The plasmonic structure is a series of concentric circular slits etched in a thick gold film on a glass substrate. An outgoing circular SPP wave is generated from the tip-sample junction and is scattered into light by the slits. We compare the resulting emission pattern to that observed when exciting SPPs on a thin, unstructured gold film. For optimized parameters, the light emitted from the plasmonic lens is radially polarized. We describe the effects of the slit period and number, and lens diameter on the emission pattern and we diskuss how the light beam of low divergence is formed

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Temporal coherence of propagating surface plasmons

Cited by 21 publications

References 15 publications

Probing Decoherence in Plasmonic Waveguides in the Quantum Regime

Probing Decoherence in Plasmonic Waveguides in the Quantum Regime

Revealing the spectral response of a plasmonic lens using low-energy electrons

Using a plasmonic lens to control the emission of electrically excited light

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