Brian H. Fisher, PhD.

McKnight Doctoral Fellow

Graduate Research Assistant

 


University of Central Florida

Electrical Engineering and Computer Science

 4000 Central Florida Blvd.
 Orlando, Florida, 32816
 ENG I, Rm. 240 

 Email: brianfisher2@gmail.com

                                         Office : 407-309-9494
                                             Cell: 954-600-5521


Research

Research Group

Consortium for Applied Acoustoelectronic Technology (CAAT)

Director: Dr. Donald C. Malocha

CAAT is a part of the Advanced Material Processing and Analysis Center (AMPAC) at the University of Central Florida

Current Research

I am currently a postdoctoral research associate in the Electrical Engineering department at the University of Central Florida and the founder of TALAWAH Technologies, Inc.  My area of specialization is Radio Frequency (RF) Microelectronic and Solid State Devices.   This field is comprehensive in that the coursework allows the flexibility to engage in device physics, design, fabrication, measurement and analysis of RF Microelectronic and Solid State Devices.  The title of my dissertation is "Surface Acoustic Wave Device  Hydrogen Gas, and Cryogenic Liquid Sensors."  I work for the Consortium for Applied and Acoustoelectric Technology under Dr. Donald Malocha.  My research is sponsored by NASA Kennedy Space Center (KSC).  Thus far, my work on cryogenic liquid sensing, high temperature and hydrogen gas sensing has produced results that meet NASA's needs.  Experimentation has resulted in the creation of temperature sensors that can function from -200 to 300 degrees Centigrade.  This is important because NASA currently has no sensors which function over a temperature range this wide. These sensors may be implemented as passive (without batteries) and wireless Radio Frequency Identification (RFID) tag sensors.  Furthermore, these devices are radiation hardened, which in combination with their wide temperature range of operation makes them promising candidates for use in outer space.  In the near future, NASA may be testing these sensors in their inflatable habitats in Antarctica.  If successful, these sensors will be used on the moon.  

My work with SAW-based hydrogen gas sensors has also provided very good insight into the acoustoelectric mechanism of piezoelectric substrates.  The methodology used in the development of SAW hydrogen gas sensors is may be applied to other SAW based chemical or biological sensing applications.


Specifically, I used SAW devices to build passive, wireless physical and chemical sensors on the orthogonal frequency coded (OFC) SAW platform.  This research allowed me to become a subject expert on the use of piezoelectric SAW devices and facilitated the study of electrical and mechanical properties of thin films.  I developed a technique (and modified the theory) to isolate and measure the acoustoelectric and acoustoelastic mechanisms in SAW measurements, designed and built a real-time data acquisition system which included test fixture fabrication, and the integration of various pieces of equipment into a single software package.  For the accomplishments, I have presented and published many peer-reviewed articles and of which was awarded the best student paper at IEEE International Frequency Control Symposium in 2011.


Additional Research Interests

My primary interest in becoming an engineer was aimed at designing devices and/or systems that may make a positive impact on the world or at least make it more fun.  In keeping with this spirit, I find myself researching biological and chemical sensing applications using SAW device platforms, as well as alternative energy sources such as photovoltaic and thermoelectric power sources and systems.  I did some undergraduate work in photovoltaic power systems which was the catalyst behind my pursuit of semiconductor physics as my master’s work, unfortunately, I  have not had the opportunity to do any Ph.D work in this area. 


Areas of Concentration

 Subject

 Knowledge Level

 Comments

 Surface Acoustic Wave (SAW) Devices  AdvancedPlatform for all my sensors
 Digital Signal Processing (DSP)IntermediateUsed to design and analyze sensors
 Communication SystemsIntermediateUsed to design and extract data from sensors
Scattering Parameter Analysis Advanced  Used to design and analyze SAW devices
RF Design and Analysis Intermediate  RF matching, amplifier and resonator design.  Also necessary to design SAW sensors
 Semiconductor Physics AdvancedPrimarily my masters work, but was useful in analyzing electrical conduction mechanisms in ultra-thin films 
 Physical SensorsAdvanced This was required in order to quantify the behavior of my sensors
 Thin Film TechnologyAdvancedThis was required in order to reproducibly grow ultra-thin metal films 
 Thin Film Growth  and CharacterizationAdvanced This was required in order to characterize the ultra-thin metal films
Photolithograhic ProcessAdvanced  Used class 100 cleanroom to fabricate all SAW sensors (100s) which were used in my dissertation.

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