THz + 'X': a search for new approaches to significant problems

Lucia, Frank C. De; Petkie, Douglas T.; Shelton, Robert K.; Westcott, Sarah L.; Strecker, B. N.

doi:10.1117/12.604427

Cited by 5 publications

(3 citation statements)

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“…1) and it has the potential of playing a major role in technological and scientific application areas [1][2][3][4]. THz frequency range lies in the gap between microwave band and infrared band of frequencies.…”

Section: Introductionmentioning

confidence: 99%

Terahertz (THz) Frequency Sources and Antennas - A Brief Review

Mukherjee¹,

Gupta

2008

Int J Infrared Milli Waves

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In this paper we review THz radiation properties, generation methods, and antenna configurations. This paper suggests some new class of antennas that can be used at THz frequency, like optical antennas or Carbon nanotube antennas. THz technology has become attractive due to the low energy content and nonionizing nature of the signal. This property makes them suitable for imaging and sensing applications. But at the same time detection and generation of THz signals has been technologically challenging. This paper presents a comparative study of the generation techniques for THz frequency signals giving emphasis to the some new techniques like Quantum Cascade lasers which has created significant research interest. The main aim for this study is to find out the materials suitable for fabricating THz devices and antennas, a suitable method for generation of high power at THz frequency and an antenna that will make THz communication possible.

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Section: Introductionmentioning

confidence: 99%

Terahertz (THz) Frequency Sources and Antennas - A Brief Review

Mukherjee¹,

Gupta

2008

Int J Infrared Milli Waves

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“…While the time scale is highly scenario dependent, it is expected to be on the time scale of 1 s, which is comparable to a typical sensor integration time. Since ambient atmospheric SMM/THz attenuation is large, even in the transmission windows, this time-varying clutter can overwhelm weak spectra [11,12].…”

Section: Separation Of Absorption Signal From Fluctuationsmentioning

confidence: 99%

A Double Resonance Approach to Submillimeter/Terahertz Remote Sensing at Atmospheric Pressure

Lucia

Petkie

Everitt

2009

IEEE J. Quantum Electron.

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Abstract-The remote sensing of gases in complex mixtures at atmospheric pressure is a challenging problem and much attention has been paid to it. The most fundamental difference between this application and highly successful astrophysical and upper atmospheric remote sensing is the line width associated with atmospheric pressure broadening, ~ 5 GHz in all spectral regions. In this paper, we discuss quantitatively a new approach that would use a short pulse infrared laser to modulate the submillimeter/terahertz (SMM/THz) spectral absorptions on the time scale of atmospheric relaxation. We show that such a scheme has three important attributes: (1) The time resolved pump makes it possible and efficient to separate signal from atmospheric and system clutter, thereby gaining as much as a factor of 10 6 in sensitivity, (2) The 3-D information matrix (infrared pump laser frequency, SMM/THz probe frequency, and time resolved SMM/THz relaxation) can provide orders of magnitude greater specificity than a sensor that uses only one of these three dimensions, and (3) The congested and relatively weak spectra associated with large molecules can actually be an asset because the usually deleterious effect of their overlapping spectra can be used to increase signal strength.

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“…The higher frequencies of THz radiation relative to millimeter-wave radiation yield higher spatial resolutions and thus greater imaging stand-off potential but are able to penetrate many nonconducting, nonpolar materials such as clothing, paper, cardboard, and plastic packaging (between approximately 0.3 and 1:0 THz [3,4]) with only moderate attenuation. Above approximately 1:0 THz, the spectral signatures of many explosive solid materials are available for capture [5] by using, e.g., THz time-domain spectroscopy (THz-TDS) for imaging [4]. Recent advances in THz generation and detection technologies [6] enable the design and development of more compact and potentially portable THz imaging systems.…”

Section: Introductionmentioning

confidence: 99%

Terahertz imaging system performance model for concealed-weapon identification

et al. 2008

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The U.S. Army Night Vision and Electronic Sensors Directorate (NVESD) and the U.S. Army Research Laboratory have developed a terahertz (THz) -band imaging system performance model for detection and identification of concealed weaponry. The MATLAB-based model accounts for the effects of all critical sensor and display components and for the effects of atmospheric attenuation, concealment material attenuation, and active illumination. The model is based on recent U.S. Army NVESD sensor performance modeling technology that couples system design parameters to observer-sensor field performance by using the acquire methodology for weapon identification performance predictions. This THz model has been developed in support of the Defense Advanced Research Project Agencies' Terahertz Imaging Focal-Plane Technology (TIFT) program and is currently being used to guide the design and development of a 0:650 THz active-passive imaging system. This paper will describe the THz model in detail, provide and discuss initial modeling results for a prototype THz imaging system, and outline plans to calibrate and validate the model through human perception testing.

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THz + 'X': a search for new approaches to significant problems

Cited by 5 publications

References 0 publications

Terahertz (THz) Frequency Sources and Antennas - A Brief Review

Terahertz (THz) Frequency Sources and Antennas - A Brief Review

A Double Resonance Approach to Submillimeter/Terahertz Remote Sensing at Atmospheric Pressure

Terahertz imaging system performance model for concealed-weapon identification

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