NSF Award
0740625
This Small Business Innovation Research Phase I research project proposes to develop a Compact TeraHertz (THz) Air-Breakdown-Coherent Detection (ABCD) Spectrometer. Specifically, this research will construct and integrate this THz spectrometer based on recent experimental and theoretical research on broadband THz waves produced from laser-induced plasma in ambient air. A focused optical pulse in a gas creates atmospheric plasma (ionized gas molecules) which produces very intense, highly-directional, and ultra-broadband THz waves in the far field. Through the reciprocal process, this plasma could also serve as a sensor of pulsed THz waves through air-breakdown coherent detection. With the introduction of secondary synchronized laser pulses, amplification of the THz field (amplitude, phase, and radiation direction) can also be achieved.<br/><br/>Recent significant advances in THz science and technology will help scientists and engineers to use pulsed plasma to emit, control, enhance, and measure broadband THz waves. Applications include non-destructive testing, tomographic imaging, label-free genetic analysis, cellular level imaging, explosives detection, and chemical/biological sensing. In addition to advancing numerous sensing and imaging concepts in the THz frequency range, with an immediate impact on non-destructive analysis, a short-term application for homeland security and a longer-term interest in the biomedical sector.
