Rensselaer Polytechnic Institute

Jingle Liu

Xi-Cheng Zhang

Benjamin Clough

Methods and systems for detecting radiation for example, terahertz radiation, with the aid of acoustic signal generation and detection include: directing an optical beam into a volume of gas; ionizing at least a portion of the volume of gas with the optical beam to produce a plasma; and detecting an acoustic signal produced from an interaction of a radiation wave with the plasma. The methods and systems are particularly adapted for remote detection of chemicals, biological substances, and explosives, among others. The capability of the methods and systems can be enhanced by employing multi-color laser excitation to produce the plasma and varying the time delay between the multi-color pulses.

Acoustic methods and systems for detecting terahertz radiation

Methods and systems for characterizing a plasma with radiation, particularly, terahertz (THz) radiation, are disclosed. The disclosed method of characterizing a plasma includes directing THz radiation into the plasma; and detecting an emission due to interaction of the THz radiation with the plasma to characterize the plasma. A disclosed plasma characterizing device includes a means for directing THz radiation into a plasma; and a detector adapted to detect an emission emitted by the plasma due to interaction of the THz radiation with the plasma to characterize the plasma. A plasma characterizing system is also disclosed. The emission detected may be a fluorescence, a variation in fluorescence and/or an acoustic emission.

Plasma diagnostic method using terahertz-wave-enhanced fluorescence

Methods and systems for detecting radiation, particularly, terahertz (THz) radiation, are disclosed. The methods and systems disclosed include directing an optical beam in a volume of gas; ionizing at least a portion of the volume of gas with the optical beam to produce a plasma; and detecting a fluorescence produced from an interaction of a radiation wave with the plasma. The information contained in the characteristics of the detected fluorescence, for example, the amplitude and/or phase are used to characterize the radiation wave. Aspects of the invention may be used for homeland security, medicine, and astronomy, among other fields.

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Troy, NY, United States of America

Jingle Liu