A single gold particle as a probe for apertureless scanning near‐field optical microscopy

Kalkbrenner, Thomas; Ramstein, Marcus; Mlynek, J.; Sandoghdar, Vahid

doi:10.1046/j.1365-2818.2001.00817.x

Cited by 266 publications

(186 citation statements)

References 24 publications

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“…6͒, and with the outer diameter we use in the former description ͑124 nm͒, a particle with core/ shell radii ratio of 0.851 gives a scattering peak at 634 nm, longer than the operating wavelength of 620 nm, while the particle with 0.834 radii ratio resonate at 605 nm, shorter than the operating wavelength. By testing the particles one by one using modern near-field technology, [17][18][19] one can, in principle, find the desired reflector and directors. We also point out that although the scattering property of the concentric particles may change rapidly with the ratio of radii due to their small size, the radiated power pattern of the entire array may maintain its general shape over a certain range of operating wavelengths ͑620-674 nm͒.…”

Section: Discussionmentioning

confidence: 99%

Shaping light beams in the nanometer scale: A Yagi-Uda nanoantenna in the optical domain

2007

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A Yagi-Uda-like optical nanoantenna concept using resonant core-shell plasmonic particles as its "reflectors" and "directors" is studied numerically. Such particles when placed near an optical dipole source in a certain arrangement may exhibit large induced dipole moments, resulting in shaping the far-field radiation pattern, analogous to the far field of classical Yagi-Uda antennas in the microwave regime. The variation of the ratio of radii in concentric core-shell nanostructure is used to tailor the phase of the polarizabilities of the particles and, consequently, the antenna's far-field pattern. The idea of a nanospectrum analyzer is also briefly proposed for molecular spectroscopy.

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Section: Discussionmentioning

confidence: 99%

Shaping light beams in the nanometer scale: A Yagi-Uda nanoantenna in the optical domain

2007

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“…Such phenomena could lead to a material selective trapping. It will also be interesting to explore the possibility of trapping a small gold particle, a few nanometers in size, and use it as a highly localized probe for topographic or spectroscopic studies 29,30 .…”

Section: Discussionmentioning

confidence: 99%

Selective nanomanipulation using optical forces

2002

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We present a detailed theoretical study of the recent proposal for selective nanomanipulation of nanometric particles above a substrate using near-field optical forces [Chaumet et al. Phys. Rev. Lett. 88, 123601 (2002)]. Evanescent light scattering at the apex of an apertureless near-field probe is used to create an optical trap. The position of the trap is controlled on a nanometric scale via the probe and small objects can be selectively trapped and manipulated. We discuss the influence of the geometry of the particles and the probe on the efficiency of the trap. We also consider the influence of multiple scattering among the particles on the substrate and its effect on the robustness of the trap.

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“…Next we evaporated about 8 nm of chromium and removed the latex beads. The resulting sample consists of 2 µm round openings in a semi-transparent Cr film on a cover glass with very sharp edges that rise within less than 10 nm [11]. This sample was placed on a 3D piezoelectric scanner, mounted on an inverted microscope.…”

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confidence: 99%

Optical Microscopy via Spectral Modifications of a Nanoantenna

et al. 2005

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The existing optical microscopes form an image by collecting photons emitted from an object. Here we report on the experimental realization of microscopy without the need for direct optical communication with the sample. To achieve this, we have scanned a single gold nanoparticle acting as a nano-antenna in the near field of a sample and have studied the modification of its intrinsic radiative properties by monitoring its plasmon spectrum.PACS numbers: 07.79. Fc, 42.50.Lc, 78.67.Bf Over the years, several clever techniques such as darkfield, phase contrast, fluorescence, differential interference contrast, confocal, and scanning near-field microscopies have provided powerful ways of performing optical imaging. In all these methods, as in any other visual process, one "sees" an object when photons originating from it reach the detector. The details of the imaging mechanism depend sensitively on the intensity, phase and polarization of light both in the illumination and collection channels. The thought of recording optical images without receiving photons from the object, therefore, seems to be a contradiction in terms. In this Letter we show that this is indeed possible if one monitors the intrinsic spectral properties of a nanoscopic antenna scanned close to the sample.When an oscillating dipole is placed in confined geometries its radiative properties, such as eigenfrequency and linewidth, are modified [1,2]. In an intuitive picture these modifications are due to the interaction of the oscillating dipole with its image dipoles whereby the boundary materials and their distances to the oscillator determine the strength and phase of this interaction. In an alternative point of view the radiative changes are due to the modification of the density of photon states available for emission. In the context of recent developments in nano-optics, theoretical investigations have extended these concepts to subwavelength geometries and have shown that the linewidth [3,4,5,6,7] and the transition frequency [5,6] of a dipole also respond sensitively to the optical contrast of its nanoscopic environment.

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A single gold particle as a probe for apertureless scanning near‐field optical microscopy

Cited by 266 publications

References 24 publications

Shaping light beams in the nanometer scale: A Yagi-Uda nanoantenna in the optical domain

Shaping light beams in the nanometer scale: A Yagi-Uda nanoantenna in the optical domain

Selective nanomanipulation using optical forces

Optical Microscopy via Spectral Modifications of a Nanoantenna

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