Coherence and aberration effects in surface plasmon polariton imaging

Berthel, Martin; Jiang, Quanbo; Chartrand, Camille; Bellessa, J.; Huant, S.; Genet, Cyriaque; Drezet, Aurélien

doi:10.1103/physreve.92.033202

Cited by 13 publications

(30 citation statements)

References 62 publications

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“…The analysis of the resulting SP field informs on the dipolar nature of the tip, which is characteristic of a SP emission launched by an electric in-plane dipole. These features, with two lobes in the direct plane ( Fig.2(a)) and two bright arcs in the Fourier plane ( Fig.2(b)), are expected for an aperture tip and have been studied in detail in [27]. The observed interference fringes in Fig.2(a) are associated with an Airy diffraction pattern induced by the finite NA of the microscope objective [27,31,32].…”

Section: Partial Optical Ldos In a Spiral Plasmonic Cavitymentioning

confidence: 86%

“…These features, with two lobes in the direct plane ( Fig.2(a)) and two bright arcs in the Fourier plane ( Fig.2(b)), are expected for an aperture tip and have been studied in detail in [27]. The observed interference fringes in Fig.2(a) are associated with an Airy diffraction pattern induced by the finite NA of the microscope objective [27,31,32]. Furthermore, in Fig.2(b) we verify that the intensity of the uniform background (k < k SP ), which is due to the directly transmitted light from the tip, is sufficiently weak so we can neglect its contribution in the following experiments.…”

Section: Partial Optical Ldos In a Spiral Plasmonic Cavitymentioning

confidence: 99%

“…Then the LDOS maps are compared to that obtained for a ring-shaped plasmonic system with rotational symmetry (See Fig.1(c)). The scattered electromagnetic field is collected using an oil immersion objective of high numerical aperture (NA) whose back focal plane can be imaged by a removable Fourier lens [27,28]. For a given tip position, wide-field imaging of both direct and Fourier planes can be recorded via a CCD camera.…”

Section: Partial Optical Ldos In a Spiral Plasmonic Cavitymentioning

confidence: 99%

“…On the other hand, the quantum probe consists of nitrogen-vacancy (NV) centers hosted in a diamond nanocrystal, which have the advantage of featuring high photostability at room temperature. The nanodiamond is grafted at the apex of a bare optical tip as detailed in [23,24,27,28]. A sketch of the experimental setup is shown in Fig.1(a).…”

Section: Partial Optical Ldos In a Spiral Plasmonic Cavitymentioning

confidence: 99%

“…For a given tip position, wide-field imaging of both direct and Fourier planes can be recorded via a CCD camera. Noteworthy, in case of a sufficiently thin metallic film (typically 50 nm thick), SPs leak through the metal, propagate into the glass substrate and can then be collected in the far field by leakage radiation microscopy (LRM) [27,[29][30][31]. As they leak at a specific angle θ LR , corresponding to the wavevector matching condi-…”

Section: Partial Optical Ldos In a Spiral Plasmonic Cavitymentioning

confidence: 99%

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Chiral optical local density of states in a spiral plasmonic cavity

et al. 2016

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We introduce a new paradigm: the chiral electromagnetic local density of states (LDOS) in a spiral plasmonic nanostructure. In both classical and quantum regimes, we reveal using scanning near-field optical microscopy (NSOM) in combination with spin analysis that a spiral cavity possesses spin-dependent local optical modes. We expect this work to lead to promising directions for future quantum plasmonic device development, highlighting the potentials of chirality in quantum information processing.

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Section: Partial Optical Ldos In a Spiral Plasmonic Cavitymentioning

confidence: 86%

Section: Partial Optical Ldos In a Spiral Plasmonic Cavitymentioning

confidence: 99%

Section: Partial Optical Ldos In a Spiral Plasmonic Cavitymentioning

confidence: 99%

Section: Partial Optical Ldos In a Spiral Plasmonic Cavitymentioning

confidence: 99%

Section: Partial Optical Ldos In a Spiral Plasmonic Cavitymentioning

confidence: 99%

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Chiral optical local density of states in a spiral plasmonic cavity

et al. 2016

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Directional and Singular Surface Plasmon Generation in Chiral and Achiral Nanostructures Demonstrated by Leakage Radiation Microscopy

et al. 2016

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In this paper, we describe the implementation of leakage radiation microscopy (LRM) to probe the chirality of plasmonic nanostructures. We demonstrate experimentally spin-driven directional coupling as well as vortex generation of surface plasmon polaritons (SPPs) by nanostructures built with T-shaped and Λ-shaped apertures. Using this far-field method, quantitative inspections, including directivity and extinction ratio measurements, are achieved via polarization analysis in both image and Fourier planes. To support our experimental findings, we develop an analytical model based on a multidipolar representation of Λ-and T-shaped aperture plasmonic coupler allowing a theoretical explanation of both directionality and singular SPP formation. Furthermore, the roles of symmetry breaking and phases are emphasized in this work. This quantitative characterization of spin-orbit interactions paves the way for developing new directional couplers for subwavelength routing. PACS numbers:Chiral plasmonic nanostructures [1] exhibit unique optical properties, such as asymmetric optical transmission [2] and singular optical signatures, like vortices, visible in both the optical near-field [3,4] and in the far-field of twisted structures [5,6]. Motivated by fundamental questions as well as by their potentials ranging from highly integrated photonic circuits to quantum optics [1,7], interest in the field of chiral plasmonics has subsequently become a topic of intensive research. These peculiar optical effects stem from the spin-orbit interactions of light via plasmonic nanostructures, in which the photon spin couples to its spatial motion [3] and in particular to its orbital angular momentum. This leads to optical spin Hall effects [8,9], i.e., to a polarization-dependent photon shift evidenced with SPPs [3, 10, 11] which can be used for instance for inducing SPP directional coupling [12][13][14]. In this context, recent studies done in the optical near-field demonstrated that spin-controlled SPP directionality and vortex generation can be achieved with chiral nanostructures such as T-shaped aperture arrays, rings or spirals milled in metal films [15,16]. While the additional degree of freedom added by the incident spin enables tunable directionality, enhanced directional coupling is achieved by the broken symmetry of the plasmonic structures. Moreover, since controlling SPP propagation direction and rotational motion is essential for applications in integrated optics and optical trapping, it becomes urgent to develop sensitive imaging techniques to map plasmonic chirality not only in the near-field but also in the far-field. Due to the inherently confined SPP fields, near-field optical detection has been widely employed in the past to image SPP propagation (for a review see [17]). Indirect imaging via scattering of SPPs or via grating have also been used [18][19][20]. Here, we propose a different approach based on leakage radiation microscopy (LRM) [21][22][23]. As a complementary method for direct imaging of SPP propagation, L...

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Manifestation of Planar and Bulk Chirality Mixture in Plasmonic Λ-Shaped Nanostructures Caused by Symmetry Breaking Defects

et al. 2017

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We report on the coexistence of planar and bulk chiral effects in plasmonic Λ-shaped nanostructure arrays arising from symmetry breaking defects. The manifestation of bi-(2D) and three-dimensional (3D) chiral effects are revealed by means of polarization tomography and confirmed by symmetry considerations of the experimental Jones matrix. Notably, investigating the antisymmetric and symmetric parts of the Jones matrix points out the contribution of 2D and 3D chirality in the polarization conversion induced by the system whose eigenpolarizations attest to the coexistence of planar and bulk chirality. Furthermore, we introduce a generalization of the microscopic model of Kuhn, yielding to a physical picture of the origins of the observed planar chirality, circular birefringence, and dichroism, theoretically prohibited in symmetric Λ-shaped nanostructures.

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Coherence and aberration effects in surface plasmon polariton imaging

Cited by 13 publications

References 62 publications

Chiral optical local density of states in a spiral plasmonic cavity

Chiral optical local density of states in a spiral plasmonic cavity

Directional and Singular Surface Plasmon Generation in Chiral and Achiral Nanostructures Demonstrated by Leakage Radiation Microscopy

Manifestation of Planar and Bulk Chirality Mixture in Plasmonic Λ-Shaped Nanostructures Caused by Symmetry Breaking Defects

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