Polarization conversion in the reflectivity properties of photonic crystal waveguides

Dept. of Phys. & Astron., Univ. of Sheffield
IEEE Journal of Quantum Electronics (Impact Factor: 1.89). 08/2002; 38(7):880 - 884. DOI: 10.1109/JQE.2002.1017601
Source: IEEE Xplore


Strong resonant polarization conversion is observed in the
reflectivity properties of one-dimensional (1-D) lattices of air
trenches deeply etched in AlGaAs surface waveguides. The symmetry
properties and the magnitudes of the observed effects are found to be in
good agreement with the results of scattering matrix calculations

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Available from: Alan D Bristow, Apr 25, 2013
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    • "In the diffraction-limited microscopes, the resolution scales with λ. In the case of microsphere-assisted imaging, the possible factors responsible for super-resolution include surface plasmon resonances in metallic nanostructures [12], whispering-gallery modes in dielectric microspheres [13], photonic nanojets [14] [15], and folded photonic dispersions in periodic structures [16] [17]. It can be suggested that in some of these mechanisms the resolution should be resonantly dependent on λ. "
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    ABSTRACT: Microsphere-assisted ultramicroscopy is a powerful, yet simple, technique to visualize nanometric-scale objects with visible light. In this method, dielectric microspheres are placed in contact with the nanoscale objects, so that the spheres experience object's optical near-fields. The mechanism of imaging is still debated in the literature; however it is likely to involve surface plasmon resonances in metallic nanostructured objects, whispering gallery modes in dielectric microspheres and other factors. In this work we extended this technique from visible to deep-UV range. It is shown that imaging of nanoplasmonic structures at the wavelength of 248 nm can be achieved with ∼ 55 – 60 nm resolution, far beyond the diffraction limit. These results could shed light on the mechanism of super-resolution imaging by microspheres and further advance this technology for practical applications.
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    • "One of the most important developments was a proposal [3] of using high-index (n > 1.8) microspheres either immersed in a liquid [4] or embedded in elastomeric films [9] [10] [11]. Despite simplicity of this method illustrated in Fig. 1, the super-resolution mechanisms are still debated in the literature including photonic nanojets [12], folded plasmon-polariton dispersions in periodic structures [13] [14] [15], localized surface plasmon resonances in metallic nanostructures [16], and whispering gallery modes in microspheres or cylinders [17]. Photonic nanojets have been proposed as precision laser scalpels [18] [19] [20] [21] and for detector enhancement [22] [23]. "
    Transparent Optical Networks (ICTON), 2015 17th International Conference on, Budapest, Hungary; 07/2015
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    • "Other phenomena like resonant transmission [8] and coherent thermal emission by excitation of surface waves on a photonic crystal has been demonstrated in [9]. Recently, other nanostructured materials have been studied for their properties of polarization conversion : photonic crystal waveguides [10] and subwavelength gratings illuminated through a glass substrate [11]. "
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    ABSTRACT: We show that a photonic crystal slab can enable efficient polarization conversion. Two mechanisms are identified. The first mechanism relies on the anisotropy of the bulk properties of the metamaterial and is mediated by interferences. The second mechanism is due to the resonant excitation of leaky surface waves at the interface of the photonic crystal. The latter is analogous to the polarization conversion by excitation of surface plasmons on a metallic grating. This is another example of the possibility of mimicking plasmonics with photonic crystals. [DOI: 10.2971/jeos.2008.08038]
    Journal of the European Optical Society Rapid Publications 11/2008; DOI:10.2971/jeos.2008.08038 · 1.23 Impact Factor
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