US Government As Represented by the Secretary of the Army

Other

Stevens Institute of Technology

Hong-Liang Cui

John A Kosinski

Robert A Pastore, Jr

Alexander Raspopin

Arthur D Ballato

Thomas E Koscica

Dana J Sturzebecher

David L Rhodes

Alan C Samuels

Paul W Cooke

William R Loerop

Janet L Jensen

James O Jensen

Dwight Woolard

Yan Zhang

Zhifan Yin

Bingquan Chen

Peter R Canales

Harry Salem

A one-way reflective sensor shield with an increased bandwidth meta-materials coating is provided which substantially reduces or eliminates deleterious electronic signatures and backscattering. The one-way reflective sensor shield with meta-materials coating operates according to surface plasmonic coupling phenomena and achieves a mirror-like one-way reflection of electromagnetic signals. In this arrangement, the meta-materials coating is composed of a dielectric material, and the corrugated metal strips are composed of a metallic conductive material with a negative dielectric constant, to allow surface plasmonic coupling between the plasma in the metal and the incident electromagnetic field. Surface plasmons occur at the interface of a material with a positive dielectric constant, such as dielectric surface, with that of a negative dielectric constant, usually a metal or doped dielectric, such as the metal strips. Sensor devices and sensor shielding systems are also provided.

Meta-materials based upon surface coupling phenomena to achieve one-way mirror for various electro-magnetic signals

The present invention provides a device for frequency-selective detection of electromagnetic radiation in the terahertz region of the electromagnetic spectrum using a lateral semiconductor superlattice, a metal antenna attached to the lateral semiconductor superlattice; and a resonator comprising two mirrors and a substrate. A method for detecting electromagnetic radiation using the device is also provided.

Frequency selective terahertz radiation detector

RF programmable SAW filters achieve selectable filter performance by providing tunable input and output interdigital (IDTs) with different synchronous frequencies and substantially reduce electromagnetic interference (EMI) associated with RF signals not of interest. The RF programmable SAW filter includes tunable input and output IDT's, with the input and output IDT's having different input and output IDT synchronous frequencies. The input signal is divided into multiple output signals along multiple signal paths that are applied to an input tap weight network wherein the amplitude of each output signal may be varied individually. The individually weighted signal paths are then applied one each to individual IDT input electrode fingers in a means for IDT input, which is characterized by a synchronous frequency F. The IDT input means generates an acoustic wave that propagates to a means for IDT output, which is characterized by a synchronous frequency F, where Fand Fare not the same. The electrical signals generated in the IDT output means are processed through an output tap weight network, and the output signal is formed as a weighted sum to provide a selectable center frequency, a selectable bandwidth, a minimum insertion loss, a maximum sidelobe rejection level and a selectable filter transfer function, or phase/magnitude profile. RF programmable SAW filters, RF partially programmable SAW filters, RF fully programmable SAW filters and a method for making programmable RF SAW filters are provided.

Selectable performance filter

Fiber Bragg gratings (FBG) seismic activity sensors coupled in sensor arrays provide increased sensitivity to seismic activities, lower strain values and an absence of EMI allowing detection of troop and vehicle movements based on ground vibrations generating seismic signals. The FBG sensor head features a spring-mass configuration with a head surface, fiber optic cable and the FBG sensor attached to a spring that stretches during the acceleration of the mass. Waves propagating inside the earth and along the ground arriving at the sensor locations cause movement of the seismic activity sensors embedded in the ground and this movement induces an acceleration-dependent change in the FBG gratings placed on the sensors. In multiple sensor configurations, the cable will be connected to the other sensors in the network. FBG sensors, sensor arrays and sensor methods are provided in several embodiments.

Seismic activity monitor based on optical fiber Bragg gratings

Methods and apparatus for measuring the millimeter or submillimeter wave absorption spectra in a sample of DNA molecules are provided.

Methods and apparatus for detecting lesion-induced resonances in deoxyribonucleic acid via millimeter or submillimeter wave spectroscopy

The operational flexibility of programmable transversal filters is enhanced by incorporating switch arrays to permit passage for a plurality of tap voltages or signals to particular amplifiers in amplifier arrays. Fixed gain amplifiers may be incorporated to overcome the need to calibrate variable gain amplifiers and to reduced the number of amplifiers required.

Programmable transversal filter

The invention is directed to resonators and more particularly to an MMIC-compatible resonator which can be fabricated on an MMIC chip using MMIC processing techniques. The MMIC-compatible resonator has a substrate approximately 100 microns thick made of semi-insulating GaAs and/or AlGaAs. The substrate flanks an air via on which is fabricated a thin film piezoelectric semi-insulating GaAs film, comprising the piezoelectrically active element. The piezoelectrically active element is flanked either laterally or from the top to bottom thereof by a pair of electrodes which serve to excite the thickness shear or thickness extensional mode of the thin film piezoelectrically active element. There are a number of III-V and II-VI binary compounds and ternary, and other piezoelectric semiconductor alloys, which can be used for the purposes of the invention. The thin film measures approximately 5 microns or less in thickness and is fabricated on the semi-insulating GaAs, on the �110!, �111! or �100! axis thereof.

Thickness mode acoustic wave resonator

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Basking Ridge, NJ, United States of America

Hong-Liang Cui