Security and the military

Terahertz Electromagnetic Waves. Applications

Figure 1 - Interferograms for reference (dotted line) and in the presence of a 4.96 mm thick HDPE sample (solid line), and transmittance of the HDPE sample. (data kindly supplied by CEA LETI)

Figure 3 - Optical parameters of the LaAlO3

Figure 4 - Index and terahertz absorption of a sample composed of a mixture of bromo-cinnamic acid and HDPE

Figure 5 - Terahertz absorption of various closely related molecules and isomers of bromo-cinnamic acid

Figure 6 - Index and terahertz absorption of N- and P-doped silicon samples

Figure 7 - Ordinary (dotted lines) and extraordinary (solid lines) refractive indices and absorption coefficients for LiNbO3

Figure 8 - Optical parameters of liquid-phase water measured by THz-TDS in reflection (results obtained by the team led by S. R. Keiding, Aarhus, Denmark)

Figure 9 - Absorption of OCS (carbonyl sulfide) gas measured by THz-TDS at LPCA Dunkerque

Figure 10 - Transmission of cigarette smoke measured by continuous terahertz spectroscopy showing two absorption lines attributed to rotational modes of a formaldehyde molecule (LPCA Dunkerque)

Figure 11 - FTIR transmittance of a 2 mm thick sample of compressed fructose powder and HDPE

Figure 12 - Stripes of two isotopes of the water molecule detected by Herschel in comet 103P/Hartley 2

Figure 13 - Schematic diagram of a heterodyne spectrometer for gas characterization, using a QCL laser as local oscillator. (according to [14])

Figure 14 - Gas-phase methanol emission rays measured at different pressures and a local oscillator frequency (QCL) of 3.450232 THz (according to [14])

Figure 15 - Air transmission as a function of frequency for different propagation distances and two types of climate

Figure 16 - Images extracted from video films made with the micro-bolometer terahertz camera developed by LETI-CEA

Figure 17 - 100 GHz transmission image of a computer bag containing pistols and passive image (0.3-1 THz) of an individual concealing suspicious objects under his clothes

Figure 18 - (Visible) photograph and terahertz image of an incandescent light bulb (Photo: LOMA, Bordeaux)

Figure 19 - Photograph and terahertz image of an ammonite fossil (Photo: LOMA, Bordeaux)