Defect-induced activation of symmetry forbidden infrared resonances in individual metallic nanorods

Neubrech, Frank; García‐Etxarri, Aitzol; Weber, Daniel; Bochterle, Jörg; Shen, Hong; Chapelle, Marc Lamy de la; Bryant, Garnett W.; Aizpurua, Javier; Pucci, Annemarie

doi:10.1063/1.3437093

Cited by 30 publications

(36 citation statements)

References 26 publications

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“…It is thus generally referred in the literature to as a "dark" mode. However, it can be excited if the symmetry is broken [22, 23, 29, [52][53][54]. This can be achieved, as we show in the following, upon rotation of the sample with respect to the incident field, which under a side-illumination geometry introduces a phase shift along the antennas due to retardation.…”

Section: Interference Of Bonding and Anti-bonding Modes In Dimer Antementioning

confidence: 98%

Visualizing the near-field coupling and interference of bonding and anti-bonding modes in infrared dimer nanoantennas

et al. 2013

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Abstract:We directly visualize and identify the capacitive coupling of infrared dimer antennas in the near field by employing scattering-type scanning near-field optical microscopy (s-SNOM). The coupling is identified by (i) resolving the strongly enhanced nano-localized near fields in the antenna gap and by (ii) tracing the red shift of the dimer resonance when compared to the resonance of the single antenna constituents. Furthermore, by modifying the illumination geometry we break the symmetry, providing a means to excite both the bonding and the "dark" anti-bonding modes. By spectrally matching both modes, their interference yields an enhancement or suppression of the near fields at specific locations, which could be useful in nanoscale coherent control applications. References and links1. H. Xu, J. Aizpurua, M. Käll, and P. Apell, "Electromagnetic contributions to single-molecule sensitivity in surface-enhanced Raman scattering," Phys. Rev. E 62(3 3 Pt B), 4318-4324 (2000). 2. J. A. Schuller, E. S. Barnard, W. Cai, Y. C. Jun, J. S. White, and M. L. Brongersma, "Plasmonics for extreme light concentration and manipulation," Nat. Mater. 9(3), 193-204 (2010). 3. L. Novotny and N. van Hulst, "Antennas for light," Nat. Photonics 5(2), 83-90 (2011). 4. N. J. Halas, S. Lal, W.-S. Chang, S. Link, and P. Nordlander, "Plasmons in strongly coupled metallic nanostructures," Chem. Rev. 111(6), 3913-3961 (2011 4357-4360 (1999). 6. N. Liu, M. Hentschel, T. Weiss, A. P. Alivisatos, and H. Giessen, "Three-dimensional plasmon rulers," Science 332(6036), 1407-1410 (2011). 7. M. W. Knight, H. Sobhani, P. Nordlander, and N. J. Halas, "Photodetection with active optical antennas,"Science 332(6030), 702-704 (2011). 8. C. Radloff and N. J. Halas, "Plasmonic properties of concentric nanoshells," Nano Lett. 4(7), 1323-1327 (2004 1870-1901 (2005). 11. L. Chuntonov and G. Haran, "Trimeric plasmonic molecules: the role of symmetry," Nano Lett. 11(6), 2440-2445 (2011). 12. M. Hentschel, M. Saliba, R. Vogelgesang, H. Giessen, A. P. Alivisatos, and N. Liu, "Transition from isolated to collective modes in plasmonic oligomers," Nano Lett. 10(7), 2721-2726 (2010). 13. N. Verellen, P. Van Dorpe, C. Huang, K. Lodewijks, G. A. E. Vandenbosch, L. Lagae, and V. V. Moshchalkov, "Plasmon line shaping using nanocrosses for high sensitivity localized surface plasmon resonance sensing," Nano Lett. 11(2), 391-397 (2011). 14. V. Giannini, A. I. Fernández-Domínguez, S. C. Heck, and S. A. Maier, "Plasmonic nanoantennas: fundamentals and their use in controlling the radiative properties of nanoemitters," Chem. Rev. 111(6), 3888-3912 (2011

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Section: Interference Of Bonding and Anti-bonding Modes In Dimer Antementioning

confidence: 98%

Visualizing the near-field coupling and interference of bonding and anti-bonding modes in infrared dimer nanoantennas

et al. 2013

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“…This makes an important distinction between the radiative modes, which belong to the radiative EMLDOS and are probed by CL, and the modes usually denoted as dark in the literature. 41,42 Furthermore, the radiative EMLDOS (CL) to full EMLDOS (EELS) ratio decreases when the order of the mode is increased. 38,40 This trend reflects the reduced radiative character of the multipolar modes, which is due to both the increase of absorption losses at higher energies and the reduction of radiative damping when the multipolar order of the mode is increased.…”

Section: Numerical Simulationsmentioning

confidence: 99%

Link between Cathodoluminescence and Electron Energy Loss Spectroscopy and the Radiative and Full Electromagnetic Local Density of States

2015

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Electron energy loss spectroscopy (EELS) and cathodoluminescence (CL) have proved during the past few years to be tremendous tools to study surface plasmons in metallic nanoparticles, thanks to an extremely high spatial resolution combined with a broad spectral range. Despite their apparent close resemblance, qualitative differences between EELS and CL have been theoretically as well as experimentally pinpointed. We demonstrate that these differences are recovered when comparing the full electromagnetic local density of states (EMLDOS) and the radiative EMLDOS. Following the known relation established between EELS and the projection along the electron trajectory of the full EMLDOS, we introduce a formalism based on the Maxwell electric Green tensor to draw a link between CL and the projection along the electron trajectory of the radiative EMLDOS. We discuss in simple terms the differences between EELS (projected full EMLDOS) and CL (projected radiative EMLDOS) through modal decompositions obtained in the quasistatic approximation. Contrary to EELS, CL probes only the radiative modes. Furthermore, CL resonant line shapes may be shifted and asymmetric compared to EELS. The CL asymmetry is due to interferences in the far-field radiation from spectrally and spatially overlapping modes. Our analytical expressions are illustrated through boundary element method numerical simulations.

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“…The change from one mode to the next in this case is done by adding two nodes in the charge density. The even number of nodes can only be excited at oblique incidence [94,95]. Such higher order modes can find use in sensing applications: they can provide a higher sensitivity to changes in the environment of the particle compared to the dipolar mode, because they can have a sharper lineshape than the dipole.…”

Section: Higher Order Modes Dark Modes Hybridizationmentioning

confidence: 99%

Nanoplasmonics: Engineering and observation of localized plasmon modes

Sonnefraud

Koh

McComb

et al. 2011

Laser & Photonics Reviews

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Noble metal nanoparticles can support localized surface plasmon resonances (LSPR), acting as nanoscale classical oscillator systems. The large field enhancements and confinement effects which they bring about have motivated a vast range of studies and applications. For instance, LSPR can enhance signals in diagnostic characterization methods (SERS, SEIRA). Moreover, they are highly sensitive to their nanoscale environment and can therefore be used in sensing applications. This review article focuses on the basic physics of LSPR modes, and how they can be observed. For dipolar modes, observation is rather straightforward. However, higher order modes often require the use of more advanced experimental conditions or dedicated spectroscopic techniques such as electron energyloss spectroscopy (EELS). Eventually, bespoke LSPR modes can be engineered when different cavities are brought together to interact, giving rise to super-or sub-radiant modes, as well as Fano resonances, which in the right conditions can evolve into plasmonic induced transparency.

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Defect-induced activation of symmetry forbidden infrared resonances in individual metallic nanorods

Cited by 30 publications

References 26 publications

Visualizing the near-field coupling and interference of bonding and anti-bonding modes in infrared dimer nanoantennas

Visualizing the near-field coupling and interference of bonding and anti-bonding modes in infrared dimer nanoantennas

Link between Cathodoluminescence and Electron Energy Loss Spectroscopy and the Radiative and Full Electromagnetic Local Density of States

Nanoplasmonics: Engineering and observation of localized plasmon modes

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