Title page for ETD etd-08252005-130402


Type of Document Master's Thesis
Author Francis, Varsha
Author's Email Address vfranc1@lsu.edu
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
  • euler
  • snap through
  • bistable
Date of Defense 2005-08-05
Availability unrestricted
Abstract
A 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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