Type of Document Master's Thesis Author Francis, Varsha Author's Email Address email@example.com URN etd-08252005-130402 Title Development of Process Techniques for Bistable Microbeam Fabrication Degree Master of Science in Electrical Engineering (M.S.E.E.) Department Electrical & Computer Engineering Advisory Committee
Advisor Name Title Martin Feldman Committee Chair Ashok Srivastava Committee Member Bingqing Wei Committee Member Keywords
- snap through
Date of Defense 2005-08-05 Availability unrestricted AbstractA design which uses bistable beams to modulate light is suggested in this thesis and appropriate processing techniques are presented. A beam when placed under compression above the Euler limit has two stable states. The compression in an electroplated beam can be controlled by the plating current density of nickel during electrodeposition. This beam is attached to an electromechanical comb. Voltages applied to the combs cause the beam to snap from one stable state to another.
Structures were designed with dimensions that gave feasible voltages, snap distances, compressions required to snap. A two mask process was used for the fabrication of the device. The first mask delineates the sacrificial layer (AZ P4620) and the second mask delineates the electroplating mould (SU8-50). Developing techniques such as mechanical stirring at room temperature obtained bistable beam lengths of up to 1mm having an aspect ratio of 4. For higher aspect ratios such as 10 the amount of developed beam length was 200um. The dimensions that could be obtained were not adequate for practical applications.
Use of better equipment such as a mega sonic bath is suggested to improve the development in the bistable beam length. Reducing the bistable beam lengths is also suggested as an option.
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