book of abstracts - IM2NP

A B S T R A C T S TUESDAY, JUNE 29 N A N O S E A 2 0 1 0
Room Calendal
8H30-9h10
IR and THz near-field nanoscopy for characterizing nanoscale materials and
devices
Rainer Hillenbrand (Nanooptics Group, CIC nanoGUNE, 20018 Donostia - San Sebastian, Spain)
r.hillenbrand@nanogune.eu
The development of novel nanoscale materials, composites and devices requires ultrahigh-resolution
microscopy tools for characterization and mapping of local material properties and nanoscale confined light
fields. In this talk, I will demonstrate a near-field optical microscopy technique providing a spatial resolution
of about 10-20 nm independent of the wavelength. It is based on elastic light scattering from the probing tip
of an atomic force microscope (scattering-type near-field optical microscopy, s-SNOM [1]). Besides an
introduction of the technique, I will demonstrate some s-SNOM applications including infrared and terahertz
mapping of chemical composition, free-carrier concentration in semiconductor nanodevices [2], strain fields
and nanocracks in ceramics [3], as well as the visualization of the near-field oscillations of optical and midinfrared
plasmonic nanoantennas [4].
[1] F. Keilmann and R. Hillenbrand, Philos. Trans. R. Soc. London, Ser. A 362, 739 (2004)
[2] A. Huber, et al., Nano Lett. 8, 3766 (2008)
[3] A. Huber, et al., Nature Nanotech. 4, 153 (2009)
[4] M. Schnell, et al., Nature Photon. 3, 287 (2009)
9H10-9H30
The Suzuki surface as a template for nano-objects: An atomic force microscopy
study.
C. Barth, R. Peresutti, M. Gingras and C. R. Henry (CINaM - CNRS, Campus de Luminy, Case
913, 13288 Marseille Cedex 09) barth@cinam.univ-mrs.fr
In 1961, Kazuo Suzuki found out by X-ray diffraction experiments that a new phase is created in NaCl
crystals if the crystals are doped with divalent impurity ions (e.g., with Cd2+ or Mg2+) [1]. In this so-called
Suzuki phase, the positive divalent impurities and sodium vacancies are arranged in an highly ordered atomic
lattice, which is twice as large as the one of pure NaCl. In real crystals, the Suzuki phase can be found in
cubic precipitates, which are embedded in the NaCl matrix. Thanks to recent noncontact AFM experiments,
the surfaces of Suzuki precipitates on NaCl(001) could be precisely characterized in ultrahigh vacuum [2-4].
Basically two types of surface regions exist on NaCl:Cd2+(001) [2]: surface regions of pure NaCl and
regions of Suzuki precipitates, which cover partially the (001) surface of the crystal. It has been shown by
atomic resolution imaging, that the precipitates are indeed embedded in the NaCl matrix and that both types
of surface regions are atomically flat [3]. Each ionic species in the atomic
Suzuki structure can be unambiguously identified by just imaging [3, 4]. Kelvin probe force microscopy has
further shown, that the precipitates carry a net negative surface charge, which is due to the negative sodium
vacancies [3].
Despite many attractive properties of Suzuki surfaces like the interesting nano-structuring at the nanometer
scale and the presence of negative cation vacancies on the surface, Suzuki surfaces have not yet been used as
a substrate surface for nano-objects like molecules or metal clusters. In this contribution the Suzuki surface
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