Spectroscopic Mode Mapping of Resonant Plasmon Nanoantennas

Ghenuche, Petru; Cherukulappurath, Sudhir; Taminiau, T. H.; Hulst, Niek F. van; Quidant, Romain

doi:10.1103/physrevlett.101.116805

Cited by 364 publications

(407 citation statements)

References 25 publications

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“…The observed transition from a single spot to a two-lobed image pattern for these two equally long antennas is caused by decreasing the width of a resonant antenna, which increases the aspect ratio and thus red-shifts the spectrum. This observation further confirms that the two-lobed pattern observed in the TPPL map is due to the excitation of antibonding mode and not a result of any possible excitation via the discontinuity at the antenna edges [38,50]. …”

supporting

confidence: 79%

“…Ghenuche et al [38] demonstrated direct field mapping by scanning large antennas (total length = 1040 nm, gap = 40 nm) over a tightly focused excitation spot (illumination spot of 350 nm) and recording the TPPL signals. However, in refs.[10] and [38] only the bonding antenna mode is considered to explain the recorded TPPL maps.Here, we exploit the strong coupling between individual nanoantenna arms over a 16 nm feedgap. Such a small feedgap leads to a sufficiently large energy splitting between the hybridized modes and allows for selective mode excitation with focused laser pulses.…”

mentioning

confidence: 99%

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Mode Imaging and Selection in Strongly Coupled Nanoantennas

et al. 2010

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The number of eigenmodes in plasmonic nanostructures increases with complexity due to mode hybridization, raising the need for efficient mode characterization and selection. Here we experimentally demonstrate direct imaging and selective excitation of the "bonding" and "antibonding" plasmon mode in symmetric dipole nanoantennas using confocal two-photon photoluminescence mapping. Excitation of a high-qualityfactor antibonding resonance manifests itself as a two-lobed pattern instead of the single spot observed for the broad "bonding" resonance, in accordance with numerical simulations. The two-lobed pattern is observed due to the fact that excitation of the antibonding mode is forbidden for symmetric excitation at the feedgap, while concomitantly the mode energy splitting is large enough to suppress excitation of the "bonding" mode. The controlled excitation of modes in strongly coupled plasmonic nanostructures is mandatory for efficient sensors, in coherent control as well as for implementing well-defined functionalities in complex plasmonic devices. IntroductionPlasmonic nanostructures consisting of particular arrangements of closely spaced resonant particles are of great interest since they offer a variety of eigenmodes that evolve due to mode hybridization [1]. Characterization and well-defined excitation of such eigenmodes is important in order to achieve welldefined functionality in devices [2,3] and to successfully apply techniques of coherent control [4][5][6][7]. Nanoantennas consisting of two strongly coupled particles can serve as a model system to study the impact of mode selectivity [6,8,9]. Upon illumination nanoantennas confine and enhance optical fields [10,11] and can therefore be used to tailor the interaction of light with nanomatter [12]. Various applications of nanoantennas have been proposed and experimentally demonstrated, including enhanced single-emitter fluorescence [13][14][15], enhanced Raman scattering [16,17], near-field polarization engineering [18][19][20], high-harmonic generation [21,22], as well as applications in integrated optical nanocircuitry [23,24]. The longitudinal resonances of a symmetric dipole antenna can be understood in terms of hybridization of the longitudinal resonances of individual antenna arms, caused by the coupling over the narrow feedgap [25,26]. Such coupling causes a mode splitting into a lower-energy "bonding" mode and a higher-energy "antibonding" mode, respectively (Fig. 1). Limited by the uncertainty of conventional nanofabrication, it is often difficult to fabricate antenna arrays with a reproducible gap size below 20 nm, which is necessary to achieve significant energy splitting between the bonding and the antibonding mode. As a result, the existence of the antibonding antenna resonance has hardly been considered, although it may offer interesting opportunities, such as impedance tunability, a high quality factor due to its weakly radiative nature, the launching of propagating plasmon modes with increased propagation lengths [27] and spatial select...

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supporting

confidence: 79%

mentioning

confidence: 99%

Mode Imaging and Selection in Strongly Coupled Nanoantennas

et al. 2010

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“…As a result, an extremely strong field is developed near the interface of nanostructures [54]. The near-field enhancement effects has a great interest in some applications such as surface enhanced Raman spectroscopy (SERS) [55][56][57], nonlinear optics [58][59][60][61], and nanophotonics [62][63][64].…”

Section: Field Enhancement Through Surface Plasmonsmentioning

confidence: 99%

“…Fabrication accuracies for optical antenna necessitates down to a few nanometers. So far optical antennas have been fabricated by top-down nanofabrication techniques such as focused ion beam milling [83,84] or electron-beam lithography [85,86], and also by bottom-up self-assembly schemes [87,88]. Size of a receiver or transducer is generally much smaller than that of radiation wavelength, λ, and is normally of the order of λ/100 and at optical frequency, antenna requires dimensions to be of ~ 5 nm [89].…”

Section: Optical Antennamentioning

confidence: 99%

Nanoplasmonics and its Applied Devices

Rahman¹

2014

Journal of Nanotechnology and Smart Materials

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Nanoplasmonics makes a connection to conventional optics to the nanoworld. Interesting performance like subwavelength focusing to invisibility cloaking, nanoplasmonics have profound applications in science and engineering world from biophotonics to nanocircuitry. Metal and dielectric have free d-shell electrons. When metal and dielectric of different refractive index come in contact, these free electrons get accumulated in a region at the metal-semiconductor interface forming nanoplasmons. Practical implementation of nano device fabrication is the most challenging task due to the dissipative losses in metal. The optimum operating condition can be achieved by the efficient use of optical gain. We review here the ongoing progress in the field of nanoplasmonic research.

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“…Since the pioneering work of Mooradian in the late 1960s, 1 photoluminescence (PL) from gold nanostructures has shown great potential in many fields, such as cell imaging, 2-5 bio-sensing 6,7 and plasmonic mode mapping, [8][9][10] due to its characteristics of non-bleaching, non-blinking and high-solution imagining. The PL from gold nanostructures has been attributed to the radiative recombination of conduction band electrons below the Fermi energy with d-band holes, 1,11 which is a very inefficient process.…”

Section: Introductionmentioning

confidence: 99%

Shaping the photoluminescence from gold nanoshells by cavity plasmons in dielectric-metal core-shell resonators

Sun

Wan

et al. 2016

AIP Advances

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We report experimental investigation of the photoluminescence (PL) generated from the gold nanoshells of the dielectric-metal core-shell resonators (DMCSR) that support multipolar electric and magnetic based cavity plasmon resonances. Significantly enhanced and modulated PL spectrum is observed. By comparing the experimental results with analytical Mie calculations, we are able to demonstrate that the observed reshaping effects are due to the excitations of those narrow-band cavity plasmon resonances. We also present that the variation on the dielectric core size allows for tuning the cavity plasmon resonance wavelengths and thus the peak positions of the PL spectrum.

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Spectroscopic Mode Mapping of Resonant Plasmon Nanoantennas

Cited by 364 publications

References 25 publications

Mode Imaging and Selection in Strongly Coupled Nanoantennas

Mode Imaging and Selection in Strongly Coupled Nanoantennas

Nanoplasmonics and its Applied Devices

Shaping the photoluminescence from gold nanoshells by cavity plasmons in dielectric-metal core-shell resonators

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