Tuesday, 31 May 2016
Exhibit Hall H (San Diego Convention Center)
In 2015, the Federal Aviation Administration (FAA) has reported over 3,700 cases of lasers penetrating aircraft windshields. These laser attacks typically involve the use of commercially available laser pointers and pose a number of threats to pilots ranging anywhere from visual distraction to flash blindness. They typically occur at aircraft altitudes less than 4,000 feet when the pilots’ visibility is especially critical to successful takeoffs and landings. The laser pointers used in these attacks are manufactured in a variety of different colors including purple (405nm), blue (445nm), green (532nm), and red (650nm), and are available to the public. This work proposed a donor/acceptor functionalized quantum dot (QD) incorporated polymeric nanocomposite film to mitigate the laser intensity via fluorescence resonance energy transfer (FRET). More specifically, CdS core-shell quantum dots (QDs) functionalized with photoactive organic ligands were immobilized on the CdS nanocrystals via a non-covalent self-assembly scheme. This configuration allowed accurate control of the donor-acceptor separation distance and provided a good model system to explore FRET phenomena in polymeric films. Under aqueous conditions, heat was used to control the diameter of the CdS quantum dots. Current results show that in liquid phase, the addition of an organic dye non-covalently linked to the CdS surface showed sufficient fluorescence quenching. Initial results of simulated aircraft green laser testing revealed that there is significant energy dissipation and a noticeable (20 -50 nm) wave-shift upon exposure to nanocomposite films.