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We propose the exploration of single crystal GaN waveguides for the fabrication of optoelectronic integrated circuits. The feasibility of using GaN for short wavelength (up to 365 nm) OEIC's will be established in Phase I via the demonstration of a channel waveguide based phase shifter. The Al(sub x)GA(sub 1-x)N material system with its transparency from 365 nm to 12 microns, tunable refractive in ...

We propose to demonstrate the design, fabrication, and performance of an integrated optic based device which provides for both multiplexing and independent external modulation of three closely spaced wavelengths emitted by a multi-longitudinal mode laser. The innovative aspect of the proposed device is the use of an integrated optics device chip to enable coupling of the dispersed laser wavelength ...

We propose a six month Phase I program to demonstrate the feasibility of growing A1N single crystals to serve as substrates for subsequent A1xGa1-xN epitaxy. Our approach is to use a low pressure, high temperature (2000 C) furnace with a temperature gradient between the A1N charge and the deposition (seed) regions. Our approach is based on several innovations. These include the use of single precu ...

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Millimeter-wave circuit design requires accurate models to optimize performance, to minimize the number of preliminary designs, and to allow design centering for uniformity and high yield reducing cost and improving reliability. Existing bipolar circuit models fail at prediction of high frequency, non-linear, and switching behaviors. These models are not specified by the physical structure of the ...

Epitaxial growth of the aluminum gallium nitride (AlGaN) material system by molecular beam epitaxy (MBE) has been hindered by the lack of a suitable nitrogen source. The deposition of AlGaN at typical MBE growth temperatures results in nitrogen deficient films that suffer from low growth rates and high n-type background carrier concentrations. This problem has recently been addressed in MBE by inc ...

THIS PROJECT IS DESIGNED TO RESOLVE A CRITICAL AND ENDURING OBSTACLE TO THE DEVELOPMENT OF DEPENDABLE BIOSENOR SYSTEMS FOR THE TIMELY DETECTION OF TOXIC AND INFECTIOUS AGENTS. A PASSIVATED SENSOR SURFACE WILL BE DEVELOPED THAT WILL ASSOCIATE UNIQUELY WITH THE SPECIFIC BINDING PROTEIN IN ITS CRUDE SOURCE SOLUTION AND, UPON ACTIVATION BY LIGHT, COVALENTLY BOND THIS PROTEIN FUNCTIONALLY ORIENTED IN ...

The proposed investigation will characterize the physical properties of Chemically Bonded Ceramic (CBC) tooling currently being evaluated as production tooling by the automotive and furniture industries for fabricating plastics and molded organic foams. This information will be used to modify the tooling mix compositions to optimize the properties required to successfully form graphite reinforced ...