Theoretical and experimental study on broadband terahertz atmospheric transmission characteristics

Abstract

Broadband terahertz (THz) atmospheric transmission characteristics from 0 to 8 THz are theoretically simulated based on a standard Van Vleck-Weisskopf line shape, considering 1696 water absorption lines and 298 oxygen absorption lines. The influences of humidity, temperature, and pressure on the THz atmospheric absorption are analyzed and experimentally verified with a Fourier transform infrared spectrometer (FTIR) system, showing good consistency. The investigation and evaluation on high-frequency atmospheric windows are good supplements to existing data in the low-frequency range and lay the foundation for aircraft-based high-altitude applications of THz communication and radar.

Scaled radar cross section measurement method for lossy targets via dynamically matching reflection coefficients in THz band

“…With the higher frequency than microwave, the terahertz (THz) band promises to realize high scaling factors, and the THz RCS measurement systems have attracted increasing research attentions. [5] In accordance with the approach to generating and detecting THz waves, various types of THz RCS measurement systems have been constructed, including solid-state THz systems, [6,7] THz laser-based systems, [8][9][10] and THz time-domain spectroscopy (THz-TDS)-based systems. [11,12] Based on different systems, the RCS is measured on the scaled model, and a large scaling factor is obtained in the THz band.…”

Superconductivity of bilayer titanium/indium thin film grown on SiO 2 /Si (001)

“…Because of its high thermal sensitivity, it has wide applications in many areas, including single photon detectors from near-infrared to γ-ray, cosmic microwave background bolometers, and dark matter detectors. [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15] The T c of a bilayer superconducting thin film system could be tuned in a well controlled way by just tuning the thickness ratio of the two elements. Many bilayer systems, such as Mo/Au, Mo/Cu, Ti/Au, and Ti/Al systems, [1,11,[16][17][18][19][20][21] have been chosen for fabricating the TESs.…”