Prof. Lesley Shannon Profile

Prof. Lesley Shannon

at Simon Fraser Univ

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Author

Publications (4)

Proceedings Article | 13 May 2016 Open Access

Stretchable electronics for wearable and high-current applications

Daniel Hilbich, Lesley Shannon, Bonnie Gray

Proceedings Volume 9802, 98020R (2016) https://doi.org/10.1117/12.2219284

KEYWORDS: Stretchable circuits, Polymers, Electronics, Metals, Electromagnetism, Actuators, Microelectromechanical systems, Copper, Optical alignment, Magnetism

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Proceedings Article | 16 April 2014 Paper

A new low-cost, thick-film metallization transfer process onto PDMS using a sacrificial copper seed

Daniel Hilbich, Ajit Khosla, Lesley Shannon, Bonnie Gray

Proceedings Volume 9060, 906007 (2014) https://doi.org/10.1117/12.2045228

KEYWORDS: Copper, Photoresist materials, Electroplating, Plating, Polishing, Surface roughness, Transparency, Flexible circuits, Metals, Manufacturing

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Proceedings Article | 9 April 2013 Paper

Overcoming obstacles to creating complex MEMS platforms: parallels with the semiconductor and computer design industries

Lesley Shannon

Proceedings Volume 8691, 86910I (2013) https://doi.org/10.1117/12.2009433

KEYWORDS: Microelectromechanical systems, Computing systems, Semiconductors, Microfluidics, Performance modeling, Computer architecture, Systems modeling, Digital electronics, Electronic design automation, Complex systems

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Proceedings Article | 15 February 2011 Paper

Bidirectional magnetic microactuators for uTAS

Daniel Hilbich, Ajit Khosla, Bonnie Gray, Lesley Shannon

Proceedings Volume 7929, 79290H (2011) https://doi.org/10.1117/12.875788

KEYWORDS: Magnetism, Actuators, Microfluidics, Microactuators, Polymers, Polymethylmethacrylate, Nanocomposites, Microelectromechanical systems, Lab on a chip, Polymeric actuators

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We present the design, fabrication and characterization of a novel bidirectional magnetic microactuator. The actuator has a planar structure and is easily fabricated using processes based on laser micromachining and soft lithography, allowing it to be readily integrated into microfluidic, microelectromechanical systems (MEMS) and lab-on-a-chip (LOC) designs. The new microactuator is a thin magnetic membrane with a central magnet feature. The membrane and magnet are both composed of a magnetic nanocomposite polymer (M-NCP) material that is fabricated by embedding magnetic powder in a polydimethysiloxane (PDMS) polymer matrix. The magnetic powder (MQP-12-5) has the chemical composition of (Nd0.7Ce0.3)10.5Fe83.9B5.6, and contains grains that are 5-6 microns in size. The powder is uniformly dispersed at a weight percentage of 75 wt-% in the PDMS matrix, and micropatterned using soft lithography micromolding to realize magnetic microstructures, which sit on a thinner magnetic PDMS membrane of the same material. The molds are fabricated by laser-etching into Poly (methyl methacrylate) (PMMA) using a Universal Laser System's VersaLASER© laser ablation system. The PDMS-based M-NCP is then poured and spun over the mold patterns, producing a thin polymer membrane to which the polymer micromagnets are attached, forming a one-piece actuator. The M-NCP is initially un-magnetized, but is then magnetized by placing it in a 2.5T magnetic field to produce permanent bidirectional magnetization that is polarized in the specified direction. To characterize the bidirectional actuators, a uniform magnetic field is established via a Helmholtz coil pair, and is characterized by applying varying currents. The magnetic field (and thus the actuator deflection) is controlled by regulating the current in the Helmholtz pair. Using this apparatus, deflection versus field characteristics are obtained, with maximum deflections varying as a function of actuator dimensions and the applied magnetic field. Permanent rare earth magnets are used to produce supplemental fields for higher magnetic fields and higher deflections. Deflections of 100 micrometers and more are observed for 3 to 8 mm square membranes with central magnetic features ranging from 0.8 to 3.6 mm squares, in magnetic fields ranging from 52 to 6.2 mT. In addition, smaller membranes (1 mm and 2 mm with 0.4 mm and 0.6 mm central magnets, respectively) also deflect 20 and 50 microns, respectively, under 72 mT fields.

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