Probing dielectric interfaces on the nanoscale with elastic scattering patterns of single gold nanorods

Züchner, Tina; Failla, Antonio Virgilio; Steiner, M.; Meixner, Alfred J.

doi:10.1364/oe.16.014635

Cited by 18 publications

(26 citation statements)

References 37 publications

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“…The experiments, described here, are inspired by the results previously achieved in our group [1][2][3]8]. In short, the 2D orientation of metal nanorods can be determined with a high precision of more than 1° by a single scattering pattern [2].…”

Section: Resultsmentioning

confidence: 98%

“…Therefore, the orientation of individual particles can readily be recognized by the naked eye even from an image of a large scan area with several particles. Looking at these scattering patterns is also a powerful tool to detect variations of the refractive index at the sample interface [8]. Moreover, the technique allows to distinguish particles of various shapes since they render different patterns [1,28].…”

Section: Resultsmentioning

confidence: 99%

“…The plasmon resonances are influenced by many factors like e.g. the shape, the material and the aspect ratio of the particle or the local environment [6][7][8]. Beside other plasmonic particles, gold nanorods are of great interest because of their tunable plasmonic resonances, especially the one associated to the long axis, which can be tuned from the red to the near infrared [9].…”

Section: Introductionmentioning

confidence: 99%

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Complete three-dimensional optical characterization of single gold nanorods

et al. 2011

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We present a powerful technique to fully characterize individual gold nanorods by using confocal microscopy in combination with higher order laser modes. We obtain topological information far beyond the optical resolution limit, although the used method is diffraction limited. We perform, for the first time, the imaging of gold nanorods by recording simultaneously their scattering and luminescence signal. In the future, this might permit to extent the results achieved already in [1] to a 3D system. Moreover, the scattering pattern is strongly dependent on the phase relation between the light scattered and reflected at the sample interface, while the luminescence pattern does not depend on this phase relation. By exploiting an index matched sample geometry, we were able to omit the phase relation and therefore detect the pure scattering signal and qualitatively compare it with the luminescence one. Furthermore, as previously shown [2, 3], our technique is capable to track the rotation of single noble metal nanorods. We show that measuring the rotation rate of gold nanorods might be useful to estimate the local viscosity of the surrounding medium.

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Section: Resultsmentioning

confidence: 98%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Complete three-dimensional optical characterization of single gold nanorods

et al. 2011

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“…60 Also, higher order laser beams are utilized to differentiate nanospheres and nanorods for which the orientation can also be accurately determined. 62,63 Despite the increased sensitivity, the dimension based analysis of the nanoparticles was limited due to the double valued optical response curve of the nanoparticles as a function of dimension. 60,62 …”

Section: Optical Techniquesmentioning

confidence: 99%

Single nanoparticle detectors for biological applications

et al. 2012

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Nanoparticle research has become increasingly important in the context of bioscience and biotechnology. Practical use of nanoparticles in biology has significantly advanced our understanding about biological processes in the nanoscale as well as led to many novel diagnostic and therapeutic applications. Besides, synthetic and natural nanoparticles are of concern for their potential adverse effect on human health. Development of novel detection and characterization tools for nanoparticles will impact a broad range of disciplines in biological research from nanomedicine to nanotoxicology. In this article, we discuss the recent progress and future directions in the area of single nanoparticle detectors with an emphasis on their biological applications. A brief critical overview of electrical and mechanical detection techniques is given and a more in-depth discussion of label-free optical detection techniques is presented.

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“…in cancer therapy [18,19] or as substrates for surface enhanced Raman spectroscopy (SERS) [20][21][22][23]. The dependency of their optical properties on the local environment [3,24] could be exploited for sensing applications in (bio)chemistry, biology and medicine [25,26].…”

Section: Introductionmentioning

confidence: 99%