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Open Access research with a European policy impact...

The Strathprints institutional repository is a digital archive of University of Strathclyde's Open Access research outputs. Strathprints provides access to thousands of Open Access research papers by Strathclyde researchers, including by researchers from the European Policies Research Centre (EPRC).

EPRC is a leading institute in Europe for comparative research on public policy, with a particular focus on regional development policies. Spanning 30 European countries, EPRC research programmes have a strong emphasis on applied research and knowledge exchange, including the provision of policy advice to EU institutions and national and sub-national government authorities throughout Europe.

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Air damped microresonators with enhanced quality factor

Li, L. and Brown, J.G. and Uttamchandani, D.G. (2006) Air damped microresonators with enhanced quality factor. Journal of Microelectromechanical Systems, 15 (4). pp. 822-831. ISSN 1057-7157

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Abstract

It is known that the dissipative damping force due to the air film trapped between the bottom of surface micromachined resonators and the substrate on which they are fabricated decreases in magnitude as the separation between the two increases. The practical outcome of this is that microresonators located close to a substrate will have higher damping and a lower quality factor Q. In order to further investigate this effect and compare experimental findings with theory, a new test device that enables modulation of the damping interaction between a surface micromachined resonator and the substrate has been fabricated. The device consists of a surface micromachined polysilicon microresonator, which is self-elevated out of the plane of the substrate using a bimorph beam. A second, identical microresonator lying parallel to the plane of the substrate has also been fabricated. Both devices have been fabricated using the polysilicon multiuser microelectromechanical systems (MEMS) processes (polyMUMPs). The resonator-to-substrate separation of the elevated resonator is varied by changing the temperature of the bimorph beam, and the Q factors for different separations have been measured. Experimental results show that the elevated microresonators have Q values which are 65% higher than the in-plane microresonators. These experimental findings show good agreement with the theoretical model of damping used.