The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
We characterized the terahertz emission from a thin metal film with quasi-randomly distributed porous nanostructures. Unlike many demonstrated nanostructured metal terahertz sources, the emission is in the forward direction when the laser excitation illuminates the metal film at normal incidence, making its integration in a time-domain terahertz system straightforward. We attribute the generation...
Enhanced terahertz-to-infrared(THz-to-IR)emission from gas-surrounded nanostructured metal films as a result of femtosecond laser irradiation is systematically investigated using selected gases. The dependencies of the THz-to-IR power on the gas species, gas pressure, and pump optical power are studied for Ar, N2, Ne, and He. The experimental results reveal that the power of the THz-to-IR emission...
This paper presents a low profile ultra-wideband HF skeletal wire duoconical monopole antenna with parasitic grounded poles, which is then optimally designed using an efficient tool called charge and current marching-on-in-time (CCMOT) algorithm for analyzing thin-wire antennas together with the genetic algorithm (GA). As a result, an ultra-wideband HF antenna working between 7.5MHz and 25MHz is obtained,...
Among the various contributors to the Radar Cross Section (RCS), measurements have shown that the cavity structure have a very significant impact on the overall signature of the airplane structure1,2. We have simulated the real-time status of the electromagnetic (EM) scattering by the plasma-covered metal cavity, using the finite-difference time-domain (FDTD) method. The results show EM attenuation...
We have performed a large set of spectroscopic measurements on a set of material samples and metal mesh grids with a THz Fourier transform spectrometer and two THz Time domain spectrometers. We used the statistical nature of the measurements from their repeatability and compared the results for the two different spectroscopic techniques. We find that the two systems are roughly equivalent with functional...
We used a commercial neon lamp to detect THz waves (0.1, 0.2, 0.37 THz), IR (800 nm) and UV light (200 ~ 400 nm). The amplified responsivities at 0.1 THz, 0.2 THz, and 0.37 THz are 150 V/W, 57.5 V/W and 19.3 V/W, respectively.
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.