The application of organic semiconductor materials as thin film light emitters is studied. the materials examined are the metal phthalocyanines and chemically doped variations. they are deposited on controlled substrates by an ultrahigh vacuum molecular beam expitaxy approach to enhance film crystal… More

A method of growing single crystals and crystalline films oforganic materials for nonlinear optical applications is investigated. this method, applied to the growth of urea crystals, uses growth by vapor transport. crystals aregrown using a mixed vapor transport method combining the desired material… More

New organic conductors and semiconductors are currently being synthesized chemically based upon the metal phthalocyanines. in this work the possibility of growing these new organic semiconductor materials in thin film form by a molecular beam epitaxy method is examined. the materials are deposited… More

Thin films of organic nonlinear optical materials are deposited by vapor deposition from sublimation sources in vacuum. chemical bonding and polymerization of these materials is studied during deposition to try to improve thephysical properties of these materials relative to those of the molecular… More

Communication systems that use electro-acoustical transducers are susceptible to distortion or interruption by electromagnetic interference, electromagnetic pulses and radio frequency interference.shielding the wire carrying the electrical signal to prevent interference is not always effective or… More

We propose to develop a new type of optical filter with these properties that is constructed using thin, alternating layers of dispersive and non-dispersive media. Like the classic interference filter, this device operates through the selective constructive and destructive interference of the… More

Intelligible Voice communication in aviation systems is critical for efficient and safe performance. This work will develop a noise cancelling fiber optic microphone that can be used in electrically and acoustic noisy environments. Two pressure fiber optic microphones (FOM), a lens FOM and a shutter… More

The work proposed will develop a Noise-Canceling Fiber Optic Microphone (NCFOM) with a digital output signal for use with AF communication systems. A first-order vented cavity NCFOM design and a dual diaphragm NCFOM design will be analyzed using already developed equivalent frequency circuits to… More

Stochastic resonance is an effect in which a nonlinear system amplifies a weak and noisy modulated signal. Some signals that are too weak for direct detection can be measured using stochastic resonance systems. This project Will examine the feasibility of developing an optical stochastic resonance… More

This effort will continue the development of an optical analog microphone initiated on a previous SBIR program and will also include a feasibility study of various methods of providing total digital voice signal distribution of interphone communications between positions and with radios. the… More

An optically actuated speaker suitable for fabrication as an array in headphones is proposed. These speakers provide good fidelity in a package with a flat profile because of the speaker element array structure. Fabricated as an all optical device using fiberoptic inputs the device is also immune… More

This effort will continue the development of an optical analog microphone initiated on a previous SBIR program and will also include a feasibility study of various methods of providing total digital voice signal distribution of interphone communications between positions and with radios. the… More

"A helmet based crew communication system is designed incorporating an opticallydriven earplug as well as active noise reduction signal processing at the crewstation. The optically driven earplug is added to the helmet communication systemto both increase the passive noise rejection through use of… More

Optical coupling to an active earplug removes the wire link needed for conventional wired active earplugs. This improves ease of don and doff, eliminates potential snag hazards of a wire link and removes EMI or TEMPEST concerns with a wire link. Inaddition, there is no problem with radio… More

Optical coupling to an active earplug removes the wire link needed for conventional wired active earplugs. This improves ease of don and doff, eliminates potential snag hazards of a wire link and removes EMI or TEMPEST concerns with a wire link. Inaddition, there is no problem with radio… More

A system is designed to extract energy from background RF energy in the ambient due to radio and wireless communication sources. This energy is harvested on a continuous basis and stored on-board to provide power for anti tamper systems. This eliminates the need for maintenance of battery sources… More