Novel photorefractive CdSe/CdS Nanorods Liquid Crystal nanocomposites (Contributo in atti di convegno)

Type
Label
  • Novel photorefractive CdSe/CdS Nanorods Liquid Crystal nanocomposites (Contributo in atti di convegno) (literal)
Anno
  • 2011-01-01T00:00:00+01:00 (literal)
Alternative label
  • L. PETTI, Massimo Rippa, Marco Zanella, Liberato Manna, Pasquale Mormile (2011)
    Novel photorefractive CdSe/CdS Nanorods Liquid Crystal nanocomposites
    in SPIE PHOTONIC DEVICES+APPLICATIONS, San Diego-California, August 21-25, 2011
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • L. PETTI, Massimo Rippa, Marco Zanella, Liberato Manna, Pasquale Mormile (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • CNR, IIT (literal)
Titolo
  • Novel photorefractive CdSe/CdS Nanorods Liquid Crystal nanocomposites (literal)
Abstract
  • Nematic liquid crystals (NLCs)-based photorefractive materials are very attractive for photonic applications such as dynamic hologram, optical information processing, phase coniugation and optical switching because of their large optical anisotropy, low driving voltage, and large electro optic effects. Multimaterial nanocrystal heterostructures that contain two or more different functionalities are attractive candidates for enabling the bottom-up fabrication of unprecedented materials. CdSe/CdS nanorods present the appealing characteristics of strong and tunable light emission from green to red, are highly fluorescent and show linearly polarized emission. These characteristics open the way to a new class of nanocomposite devices based on LCs and colloidal NRs in which the unique optical properties of the inorganic moiety are combined with the electro-optical and the large optical anisotropy of the host system to develop new high performing optical and photonic devices/systems. In the present contribution we designed and fabricated novel nanocomposites devices prepared by incorporating CdSe/CdS core/shell nanorods into a NLC to realize homeotropically aligned cells. We studied the photorefractive and the orientational responses of these samples by both asymmetric two- beam coupling to measure two beam coupling gain and diffraction efficiency under the influence of an applied electric field, and forced light scattering technique. Nanorods alignment with the orientation of the LC molecules has been also investigated. A refractive index grating was written in the device in a holographic tilted configuration by two p-polarized laser beams at 514 nm. Self-diffraction of the writing beams and diffraction of a probe beam at 633 nm were measured. A high TBC gain coefficient of 270 cm-1 was achieved at a DC field applied of 3.4V/?m. First-order diffraction efficiencies were evaluated with a maximum efficiency of 7% in the dynamic grating with a nonlinear refractive index, n2, 4 × 10-2 cm2/W for E0 = 3V/?m. (literal)
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