Abstract: A method and apparatus for optical communication. A plurality of optical signals having a plurality of different frequencies is received at a receiver. The plurality of optical signals received at the receiver is sent through a non-linear optical element in the receiver such that a resulting optical signal is generated that has a frequency based on at least one of the plurality of different frequencies. Information is identified in the resulting optical signal.

Abstract: The present disclosure provides a system, method, and apparatus for detection and imaging. In one or more embodiments, the disclosed method involves transmitting, with a first optical transmitter, a first transmit signal to an object (e.g., a wire); and transmitting, with a second optical transmitter, a second transmit signal to the object. The method further involves receiving, with an optical receiver, a receive signal that is reflected from the object. In one or more embodiments, the receive signal is a function of the first transmit signal and the second transmit signal. Further, the method involves detecting, with a detector, the receive signal. The frequency of the receive signal is the sum of the frequency of the first transmit signal and the frequency of the second transmit signal, and/or is the difference between the frequency of the first transmit signal and the frequency of the second transmit signal.

Abstract: A thermally managed Li-ion battery assembly including an anode and a cathode, wherein at least one of the anode and the cathode includes a thermocrystal metamaterial structure.

Abstract: Systems and methods are provided for applying directed energy to an object. The system includes a first transmitter comprising a light source configured to emit a first light beam at a first frequency towards a focal point and a second transmitter comprising a light source configured to emit a second light beam at a second frequency towards the focal point. The first and second light beams cause a third light beam to be generated that has a third frequency that is coincident with at least one resonant frequency of the object.

Abstract: An apparatus and method for modifying an electromagnetic beam. A metamaterial structure is positioned relative to a transmitting device such that an electromagnetic beam transmitted by the transmitting device passes through the metamaterial structure. The electromagnetic beam has a wavefront with a Gaussian intensity profile. The wavefront of the electromagnetic beam is modified as the electromagnetic beam passes through the metamaterial structure such that the Gaussian intensity profile of the wavefront is changed to a Bessel intensity profile.

Abstract: A method and apparatus for detecting an object. A first optical signal having a first frequency is transmitted to a location on a surface of a ground. A second optical signal having a second frequency is transmitted to the location on the surface of the ground such that the first optical signal and the second optical signal overlap each other at the location on the surface of the ground. The overlap of the first optical signal and the second optical signal at the location generates a third optical signal having a difference frequency that is a difference between the first frequency and the second frequency. The third optical signal is configured to travel into the ground. A response to the third optical signal is detected. A determination is made as to whether an object is present in the ground using the response to the third optical signal.

Abstract: A detection system for detecting an object includes a transmitter including a light source configured to emit a first light beam having a first frequency towards the object. The detection system also includes a receiver configured to receive a second light beam reflected from the object, and a detector positioned within the receiver. The second light beam has a second frequency as a result of a non-linear optical response of a surface of the object to the first light beam. The detector is configured to detect the object based on the second frequency of the second light beam.

Abstract: A thermally managed Li-ion battery assembly including an anode and a cathode, wherein at least one of the anode and the cathode includes a thermocrystal metamaterial structure.

Abstract: The present disclosure provides a system, method, and apparatus for detection and imaging. In one or more embodiments, the disclosed method involves transmitting, with a first optical transmitter, a first transmit signal to an object (e.g., a wire); and transmitting, with a second optical transmitter, a second transmit signal to the object. The method further involves receiving, with an optical receiver, a receive signal that is reflected from the object. In one or more embodiments, the receive signal is a function of the first transmit signal and the second transmit signal. Further, the method involves detecting, with a detector, the receive signal. The frequency of the receive signal is the sum of the frequency of the first transmit signal and the frequency of the second transmit signal, and/or is the difference between the frequency of the first transmit signal and the frequency of the second transmit signal.

Abstract: A method and apparatus for optical communication. A plurality of optical signals having a plurality of different frequencies is received at a receiver. The plurality of optical signals received at the receiver is sent through a non-linear optical element in the receiver such that a resulting optical signal is generated that has a frequency based on at least one of the plurality of different frequencies. Information is identified in the resulting optical signal.

Abstract: A method and apparatus for detecting objects located underground. In one advantageous embodiment, a detection system detects objects having electrical non-linear characteristics located underground. The detection system comprises a transmitter unit, a receiver, and a processor. The transmitter transmits a plurality of pulsed radio frequency signals having a first frequency and a second frequency into a ground. The receiver monitors for a response radio frequency signal having a frequency equal to a difference between the first frequency and a second frequency, wherein the response radio frequency signal is generated by an object having the non-linear conductive characteristics in response to receiving the plurality of electromagnetic signals. The processor is connected to the transmitter unit and the receiver, wherein the processor controls an operation of the transmitter unit and the receiver, wherein the object is detected when the response radio frequency signal is detected by the receiver.

Abstract: A method and apparatus for detecting objects located underground. In one advantageous embodiment, a detection system detects objects having electrical non-linear characteristics located underground. The detection system comprises a transmitter unit, a receiver, and a processor. The transmitter transmits a plurality of pulsed radio frequency signals having a first frequency and a second frequency into a ground. The receiver monitors for a response radio frequency signal having a frequency equal to a difference between the first frequency and a second frequency, wherein the response radio frequency signal is generated by an object having the non-linear conductive characteristics in response to receiving the plurality of electromagnetic signals. The processor is connected to the transmitter unit and the receiver, wherein the processor controls an operation of the transmitter unit and the receiver, wherein the object is detected when the response radio frequency signal is detected by the receiver.

Abstract: In one embodiment a system to detect, from a remote location, one or more wires in a target location comprises a radiation targeting assembly to direct a rotating polarization radiation field at the target location, a reflected radiation collecting assembly that collects radiation reflected from the target location, and a signal processing module to monitor radiation from the rotating radiation field reflected from the target location and generate a signal when the radiation reflected from the target location indicates the presence of a wire in the target location. Other embodiments may be described.

Abstract: A composite dipole array assembly can have a composite dipole array defined by a plurality of antenna elements and a plurality of non-linear element electrically interconnecting pair of the antenna elements. A reflector can be configured to reflect electromagnetic energy toward the antenna elements. A lens can be configured to focus electromagnetic energy upon the antenna elements. In this manner, the efficiency of the composite dipole array is enhanced.

Abstract: An electromagnetic radiation filter uses a plurality of dipole antennas to mitigate the transmission of electromagnetic radiation. The dipole antennas can form one or more arrays that scatter electromagnetic radiation. Examples of application include mitigating the reception of a difference frequency in non-linear radar, use in protective goggles, and use in a protective shield.

Abstract: A method and apparatus for transmitting beams of electromagnetic energy. A plurality of beams having a first number of frequencies and a number of beams having a second number of frequencies are transmitted. The plurality of beams and the number of beams overlap each other at an area with a pattern of intensities in the area. Difference frequency signals having a number of difference frequencies equal to a difference between the first number of frequencies and the second number of frequencies are monitored. The difference frequency signals are generated by an object having non-linear electrical characteristics in response to receiving the plurality of beams and the number of beams.

Abstract: An apparatus comprises a transmitter system, a receiver system, and a processor unit. The transmitter system transmits first and second collimated beams having a first and second frequency. The receiver system monitors for a fundamental difference frequency signal having a difference frequency equal to a difference between the first and second frequency and a number of harmonics of the fundamental difference frequency signal. These signals are generated by an object having non-linear electrical characteristics in response to the collimated beams. The processor unit is connected to the transmitter system and the receiver system. The processor unit controls the transmitter and receiver systems to change at least one of the first and second frequencies through a range of frequencies and detect a range of fundamental difference frequency signals and the number of harmonics of the fundamental difference frequency signal in response to transmitting the collimated beams using the range of frequencies.

Abstract: A transmitter system can have a higher power transmitter and a lower power that are configured to transmit a pair of unbalanced radio frequency beams to a target so as to produce a difference frequency in the target. The difference frequency can disrupt operation of a device, such as a weapon. The difference frequency can provide a radar return. The use of a higher power transmitter and a lower power transmitter reduces costs, size, and weight as compared to the use of two higher power transmitters.

Abstract: In one embodiment a system to detect, from a remote location, one or more wires in a target location comprises a radiation targeting assembly to direct a rotating polarization radiation field at the target location, a reflected radiation collecting assembly that collects radiation reflected from the target location, and a signal processing module to monitor radiation from the rotating radiation field reflected from the target location and generate a signal when the radiation reflected from the target location indicates the presence of a wire in the target location. Other embodiments may be described.

Abstract: A method and apparatus for transmitting beams of electromagnetic energy. A plurality of beams having a first number of frequencies and a number of beams having a second number of frequencies are transmitted. The plurality of beams and the number of beams overlap each other at an area with a pattern of intensities in the area. Difference frequency signals having a number of difference frequencies equal to a difference between the first number of frequencies and the second number of frequencies are monitored. The difference frequency signals are generated by an object having non-linear electrical characteristics in response to receiving the plurality of beams and the number of beams.