Cylindrical vector beams of light from an electrically excited plasmonic lens

Cao, Shuiyan; Moal, Eric Le; Boer-Duchemin, Elizabeth; Dujardin, Gérald; Drezet, Aurélien; Huant, S.

doi:10.1063/1.4895769

Cited by 14 publications

(21 citation statements)

References 24 publications

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“…The coherent sum of all these dipole fields generates optical fringes in the Fourier plane. This experiment, which is reminiscent of Young's double slit experiments, allows us to exploit the coherence of SPPs in order to tailor focussed beam such as Bessel modes or polarized vortices [65,66]. Like for LRM the Fourier plane is insensitive to an index mismatch between the oil and the objective microscope glass.…”

Section: Surface Plasmon Polariton Scatteringmentioning

confidence: 99%

Coherence and aberration effects in surface plasmon polariton imaging

et al. 2015

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*We study theoretically and experimentally coherent imaging of surface plasmon polaritons using either leakage radiation microscopy through a thin metal film or interference microscopy through a thick metal film. Using a rigorous modal formalism based on scalar Whittaker potentials we develop a systematic analytical and vectorial method adapted to the analysis of coherent imaging involving surface plasmon polaritons. The study includes geometrical aberrations due index mismatch which played an important role in the interpretation of recent experiments using leakage radiation microscopy. We compare our theory with experiments using classical or quantum near-field scanning optical microscopy probes and show that the approach leads to a full interpretation of the recorded optical images.

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Section: Surface Plasmon Polariton Scatteringmentioning

confidence: 99%

Coherence and aberration effects in surface plasmon polariton imaging

et al. 2015

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“…2(b)]. This very low angular divergence as well as beaming of light along the optical axis is obtained because the scattered light is emitted in phase from the five slits of the plasmonic lens [10]. This occurs when the period of the circular grating (i.e., the radial distance between two nearest slits) equals an integral number of SPP wavelengths.…”

Section: A Full-spectrum Angular Emission Patternsmentioning

confidence: 97%

“…Intensity profiles taken from the Fourier images are shown below each image in a polar plot. For these images, light is collected using an objective lens of NA = 1.45 and the image resolution is 0.027k 0 per pixel (i.e., the NA = 1.5 circle has a diameter of ≈108 pixels) and the acquisition time is 300 s. slits gives rise to the emission of a cylindrical vector beam of light with radial polarization [10]. Figure 2(a) shows the resulting Fourier-space optical image for a five-slit circular grating of period 700 nm and inner diameter 5 μm.…”

Section: A Full-spectrum Angular Emission Patternsmentioning

confidence: 99%

“…Thus, a plasmonic lens is both a light/SPP converter and a focusing/collimating optical component, which, like an optical antenna, links the optical near and far fields. Recently, it has been shown that the combination of such a plasmonic structure with a local, electrical source of SPPs leads to the emission of a cylindrical vector beam of light [10], a class of light beams that has various applications ranging from optical communications to manipulation of single nanoparticles [11]. The local, electrical excitation of propagating SPPs may be achieved with lowenergy electrons in a scanning tunneling microscope (STM) [12][13][14][15], or high-energy electrons in a scanning electron microscope (SEM) [16][17][18].…”

Section: Introductionmentioning

confidence: 99%

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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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“…Recently, it was found that the gap mode can also excite the surface plasmon polaritons (SPPs) propagating along the metal surface 31,32 . This provides an efficient, local, electrical way of launching SPPs in optical structures, and its applications received considerable attention recently [33][34][35][36][37][38] . These results suggest that the electrical excited gap plasmon modes have several optical decay channels.…”

Section: Introductionmentioning

confidence: 99%

Decay channels of gap plasmons in STM tunnel junctions

Lu¹,

Chen²,

Xu³

et al. 2018

Opt. Express

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We study the decay of gap plasmons localized between a scanning tunneling microscope tip and metal substrate, excited by inelastic tunneling electrons. The overall excited energy from the tunneling electrons is divided into two categories in the form of resistive dissipation and electromagnetic radiation, which together can further be separated into four different channels, including SPP channel on the tip, SPP channel on the substrate, air mode channel and direct quenching channel. We find that most of the excited energy goes to surface plasmon polaritons on the metallic STM tip, rather than that on the substrate. The direct quenching in the apex of tip also takes a considerable portion especially in high frequency region.

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Cylindrical vector beams of light from an electrically excited plasmonic lens

Cited by 14 publications

References 24 publications

Coherence and aberration effects in surface plasmon polariton imaging

Coherence and aberration effects in surface plasmon polariton imaging

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

Decay channels of gap plasmons in STM tunnel junctions

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