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Optoacoustic Lens using Carbon Nanotubes J. Lingjie Guo , University of Michigan, DMR 1120187

Optoacoustic Lens using Carbon Nanotubes J. Lingjie Guo , University of Michigan, DMR 1120187.

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Optoacoustic Lens using Carbon Nanotubes J. Lingjie Guo , University of Michigan, DMR 1120187

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  1. Optoacoustic Lens using Carbon NanotubesJ. LingjieGuo, University of Michigan, DMR 1120187 This project exploits a unique properties of the carbon nanotubes and its nanoscale size. As one can focus light through a lens, ultrasound can be also focused similarly using an acoustic lens. The focused ultrasound can be used to deliver high-pressure amplitude on tissues for biomedical therapy purposes. A new way to enhance the focal accuracy up to 100-fold has been developed by U of M engineers. They developed an "optoacoustic lens" which is coated by carbon-nanotubes (CNTs) polymer composites. This unusual lens converts an incoming pulsed laser beam efficiently into a focused ultrasound on a tight spot of <100 um (~ a single hair width). Due to unique optical and thermal natures of the CNTs, the lens can generate the ultrasound with high amplitude (powerful enough for therapy) and high frequency (allows the tight spot), simultaneously. This work was published at Scientific Reports on December 18th, 2012. Optoacoustic lenses and measurement setup of Laser Generated Fucused Ultrasound and micro-scale fragmentation of the solid materials by the LGFU: The model kidney stone (scale bar = 4 mm) was treated by the LGFU. (courtesy of L. J. Guo)

  2. Digital Modulator Goes Flexible and TransparentJ. LingjieGuo, University of Michigan, DMR 1120187 In modern communication systems, modulation is a key function that embeds the baseband signal (information) into a carrier wave so that it can be successfully broadcasted through a medium such as air or cables. We demonstrated a flexible all-graphene modulator circuit with the capability of encoding a carrier signal with quaternary digital information. Remarkably, the quaternary modulation scheme, QPSK, can be realized with just 2 all-graphene transistors, representing a drastic reduction in circuit complexity when compared with conventional modulators. In addition, the circuit is not only flexible but also highly transparent (~95% transmittance) owing to its all-graphene design with every component (channel, interconnects, load resistor and source/drain/gate electrodes) fabricated from graphene films. A flexible and transparent all-graphene QPSK digital modulator. The entire circuit is made out of graphene on a plastic substrate, promising high speed signal modulation on a bendable platform. (courtesy of Z. Zhong)

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