Light in tiny holes. Nature

ISIS, Université Louis Pasteur and CNRS (UMR7006), 8 allée G. Monge, 67000 Strasbourg, France.
Nature (Impact Factor: 41.46). 02/2007; 445(7123):39-46. DOI: 10.1038/nature05350
Source: PubMed


The presence of tiny holes in an opaque metal film, with sizes smaller than the wavelength of incident light, leads to a wide variety of unexpected optical properties such as strongly enhanced transmission of light through the holes and wavelength filtering. These intriguing effects are now known to be due to the interaction of the light with electronic resonances in the surface of the metal film, and they can be controlled by adjusting the size and geometry of the holes. This knowledge is opening up exciting new opportunities in applications ranging from subwavelength optics and optoelectronics to chemical sensing and biophysics.

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    • "Basic research in plasmonic-based sensing area is still attracting considerable interest. Since Ebbesen et al. has observed the unusual phenomenon of " extraordinary optical transmission " (EOT) in subwavelength hole arrays [1], various nanostructured freeelectron metals have been investigated as potential sensors in UVevis to IR regimes [2] [3]. It is generally accepted that the EOT is caused by a resonant coupling of light to surface plasmons (SPs). "
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    ABSTRACT: For several decades the plasmonic behavior of materials have been almost exclusively studied in visible region. Emerging applications require, however, the development of efficient materials operating in UV range. In UV nanoplasmonics aluminum (Al) can play a leading role due to its advantageous electronic properties. Yet, there is still lack of reproducible method to obtain Al nanostructures with desired parameters. Al nanoconcaves can provide a way to overcome these limitations. Here, two different periodicities of the Al nanoconcaves arrays were analyzed. It was observed that the Al concaves can dramatically reduce the optical reflectivity as compared to flat, unstructured Al. At the same time pronounced reflectivity dips were discernible, which were ascribed to (0,1) plasmonic mode. The positions of the dips were at around 250 nm and 350 nm for Al concaves with interpores distance (Dc) of 246,3 nm and 456,7 nm, respectively. The refractive index sensitivity (RIS) was: ~191 nm/RIU for the Al concaves with Dc = 246,3 nm, and ~ 291 nm/RIU for the Al nanoconcaves arrays with Dc = 456,7 nm.
    Full-text · Article · Nov 2014 · Current Applied Physics
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    • "These results indicate that the reflectivity dip is dominated by the Al concaves and is only fine-tuned by the thin Ag, and Cu coating. It was previously observed that in order to get a substantial contrast between the surrounding metal and the holes, the metal must be opaque (optically thick), which means that the layer thickness (or nanoholes depth) must be several times the skin-depth of the metal [3] [60]. The skin depth is the distance where the electric filed falls to 1/e. "
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    ABSTRACT: UV plasmonics is of particular interest because of large variety of applications, where the higher energy plasmon resonances would advance scientific achievements, including surface-enhanced Raman scattering (SERS) with UV excitation, ultrasensitive label-free detection of important biomolecules absorbing light in the UV, or the possibility for exerting control over photochemical reactions. Despite its potential, UV plasmonics is still in its infancy, mostly due to difficulties in fabrication of reproducible nanostructured materials operating in this high energy range. Here, we present a simple electrochemical method to fabricate regular arrays of aluminum concaves demonstrating plasmonic properties in UV/violet region. The method enables the preparation of concaves with well-controlled geometrical parameters such as interpore distance (Dc), and therefore, well controllable plasmon resonances. Moreover, the patterning is suitable for large scale production. The UV/violet properties of Al concaves can be further fine-tuned by Ag and Cu metals. The refractive index sensitivity (RIS) increases after the metals deposition as compared to RIS of pure Al nanohole arrays. The highest RIS of 404 nm/RIU was obtained for Cu coated Al nanoconcaves with the Dc = 460.8 nm, which is similar or better than the RIS values previously reported for other nanohole arrays, operating in visible/near IR range.
    Full-text · Article · Sep 2014 · Applied Surface Science
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    • "So, various photonic systems, such as microcavities [9,10] and photonic crystals [11-13], have been proposed to manipulate the lifetime of QEs. Recently, metallic nanostructures have attracted extensive of interest as they support surface plasmonic resonances, which are the collective oscillations of the electron gas in metals [14,15]. Surface plasmons may greatly enhance the local electromagnetic field that leads to nanoscale ‘hot spots’ [16,17]. "
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    ABSTRACT: Spontaneous emission lifetime orientation distributions of a two-level quantum emitter in metallic nanorod structures are theoretically investigated by the rigorous electromagnetic Green function method. It was found that spontaneous emission lifetime strongly depended on the transition dipole orientation and the position of the emitter. The anisotropic factor defined as the ratio between the maximum and minimum values of the lifetimes along different dipole orientations can reach up to 10(3). It is much larger than those in dielectric structures which are only several times usually. Our results show that the localized plasmonic resonance effect provides a new degree of freedom to effectively control spontaneous emission by the dipole orientation of the quantum emitters.
    Full-text · Article · Apr 2014 · Nanoscale Research Letters
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