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Micro-Ring Cavity Gyroscope with Magnetic Field Lock-In Minimization Inventors:

Patent Number: Issue Date:

Prather, Dennis; Murakowski, Janusz A. 6,603,558

Docket Number: UD02-04

August 5, 2003

The invention embodies a micro-ring cavity gyroscope with a sensitivity axis for sensing rotational motion comprising: at least one micro-ring cavity laser comprising a light amplifying medium and magnetooptical material capable of generating an electromagnetic standing wave; at least one standing wave detection means; and means for generating a magnetic field that at least partially immerses said micro-ring cavity laser in a magnetic field, wherein said standing wave detection means senses the position of the electromagnetic standing wave with respect to said micro-ring cavity laser, and the magnetic field perturbs the electromagnetic standing wave to minimize lock-in phenomenon enabling detection of rotational motion. Etchless Fabrication of Planar Photonic Bandgap Structures in High Index Material Inventors:

Patent Number: Issue Date:

Murakowski, Janusz; Pustai, David; Prather, Dennis 7,157,296

Docket Number: UD02-17/18

January 2, 2007

The invention is a new process for making planar photonic bandgap (PBG) structures consisting of regularly distributed holes in high index dielectric material. It also allows for controlled placement defects within the PBG lattice so as to pattern waveguides, cavities, etc., for creating photonic devices. The PMMA perforated membrane is obtained in a way described therein. It is accomplished by sputtering silicon. Silicon has a high refractive index of ~3.4 for near infrared wavelengths, thereby allowing for opening a wide photonic bandgap and thus improved operational characteristics of the PBG structure as compared to the pure PMMA membrane. It should be noted that obvious modifications to the described procedure could be applied without departing from the spirit of the invention. For example, material other than silicon can be deposited as the high index guiding medium. Also, sputtering can be replaced by other methods suitable for depositing thin films, such as evaporation or chemical vapor deposition (CVD). 46

INVENTIONS - Technologies Available for Licensing

Electro-Optical Two-by-Two Switching in a Photonic Bandgap Waveguided Coupler Inventors:

Serial Number: Filling Date:

Prather, Dennis W.; Sharkawy, Ahmed; Shi, Shouyuan; Soref, Richard A. 10/502,071

Docket Number: UD02-26

July 19, 2004

The invention provides a new technique for switching an electromagnetic wave propagating through photonic crystal waveguides. Electromagnetic waves can be either microwave or optical regime based on the constituent materials of a photonic crystal. The invention makes use of coupled photonic crystal waveguides, where the coupling coefficient between nearby waveguides can be modulated via an external electrical or optical means. We propose that the “loss tangent” of dielectric material in the coupling region can be modified by external “commands” to spoil the coupling, thereby re-routing the light. We have found that the induced loss does not significantly attenuate the waves traveling in the straight-through channels. To attain switching in 2D PBG guides made from silicon/air, the free-carrier absorption loss of Si can be controlled by (1) carrier injection from forward-biased PN junctions on the posts; (2) depletion of doped posts with MOS gates; (3) generation of electrons and holes by abovegap light shining upon the designated pillars, a contact less process. If the PBG coupler is implemented in III-V semiconductor heterolayers, then the electro-absorption effect could be used.

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