Publications

Biological Applications of Micromachined Ultrasonic Flexural Plate-Wave Technology

Audra Hsien-I Meng
Richard M. White
Rajendra Bhatnagar
Albert P. Pisano
1999
The micromachined acoustic flexural plate-wave (FPW) device has many applications in biological research and medical diagnostics. In order to safely use the FPW device for these applications, we studied the effects of ultrasound produced with the device on biological...

The Development of Lead Zirconate Titanate Thin Films for Piezoelectric Microactuators

Annabel Susan Nickles
Eugene E. Haller
Richard M. White
Timothy D. Sands
1998
Piezoelectric actuation of a thin film is one means used for electrical-mechanical transduction in Microelectromechanical systems (MEMS). Currently, the most commonly employed piezoelectric thin-film material is ZnO. Replacing ZnO with certain compositions of lead zirconate titanate (PZT)...

Design, Fabrication, and Optimization of Micromechanical Flexures

Young-Ho Cho
Albert P. Pisano
Roger T. Howe
1990

In this dissertation are described two types of micromechanical flexures for guiding mov- able micromechanical structures with applications to high-precision Micro Electro Mechanical Systems (MEMS), whose typical sizes are in the order of ...

Design and Fabrication of PZT-Actuated Silicon Suspensions for Hard Disk Drives

Tsung-Lin Chen
Roberto Horowitz
Roger T. Howe
Albert P. Pisano
2001
Piezoelectrically actuated suspensions are currently being considered by the magneticrecording industry, as a means of achieving dual-stage actuation in magnetic Hard Disk Drives. In most designs, piezoelectric actuators are ...

Large Displacement Electrostatic Microactuators With Polysilicon Flexure Suspensions

Reid Alyn Brennen
Albert P. Pisano
Roger T. Howe
Homayoon Kazerooni
1993

Two electrostatically-driven surface-micromachined microactuators designed for large displacement motion are presented along with a literature review of microactuators that includes over 300 references. The first polycrystalline silicon device, the semaphore, achieves large amplitudes by resonant excitation of a plate mass attached to the end of a cantilever beam. The semaphore is driven by either linear or curved electrostatic comb drives. The second device, the tangential drive, uses the direct electrostatic force between two charged bars to attain large static displacements in one of...

The Fracture Strength of Brittle Films for Micro-Electro-Mechanical Systems (MEMS) Devices

Peter Truxtun Jones
George C. Johnson
Roger T. Howe
Lisa A. Pruitt
1999
This work investigates the fracture behavior of brittle thin films used as structural materials for Micro-Electro-Mechanical Systems (MEMS) devices. Static fracture is a possible mode of failure for MEMS devices, and as such...

Design, Fabrication, Position Sensing, and Control of Electrostatic, Surface-Micromachined Polysilicon Microactuators

Patrick Ching-Pak Cheung
Roberto Horowitz
Roger T. Howe
Albert P. Pisano
1995
This dissertation describes the design, fabrication, position sensing, and control of an electrostatically-driven microactuator. The polysilicon microactuator, together with an on-chip electronic buffer, were fabricated by the Modular ...

Fluidic Microsystems Fabricated in Epoxy

Nelson Kuan
Albert P. Pisano
Dorian Liepmann
Susan J. Muller
2001
SU-8 epoxy was applied in fabricating microfluidic systems through a low-cost and robust process. The complete fabrication and packaging process is introduced in this work and further highlighted by the presentation of two application examples: a static fluidic structure design ...

Surface Treatments for Adhesion Reduction in Polysilicon Micromechanical Devices

Michael Robert Houston
Roya Maboudian
Roger T. Howe
David B. Graves
1996
This work investigates the interactions between polysilicon surfaces for the purpose of alleviating the strong interfacial adhesion present between contacting microstructure sufaces, a problem referred to as stiction. Without specifically-designed...

Control of Fluids in Microscale Devices

Michael James DeBar
Dorian Liepmann
Albert P. Pisano
Richard M. White
2001
Pumping in microdevices due to gradients in surface tension was investigated both theoretically and experimentally. When a gradient in surface tension exists along an interface between two fluids, there is a net motion of the interface. The...