OR optical rectification, LN lithium niobate, DFG difference-frequency generation, CTR coherent transition radiation, PCA photoconductive antenna, STE spintronic THz emitter Full size image OR in lithium niobate (LN) has also been widely used due to its high nonlinearity30 and high damage threshold31...
4c). However, allocating a lock-in amplifier channel to each pixel is not a scalable readout architecture, limiting the total number of pixels of the demonstrated 1D photoconductive antenna arrays to 16. While using 1D photoconductive antenna arrays enables concurrent acquisition of the image data ...
The working principle of the THz LWA is analyzed in detail using the theory of dispersion relation formulae and the equivalent CRLH circuit model. The THz LWA is verified by numerical simulations, and the frequency scannable capability of the THz LWA is confirmed. The proposed antenna has great...
Metasurfaces have become a rapidly growing field of research in recent years due to their exceptional abilities in various modern applications like absorbing meta-devices [13], antenna engineering [14], Bessel beam generation [15], wavefront shaping [16], and intelligent imaging/recognizing [17]....
The device is a 'rectenna' - an antenna directly coupled to a diode, which is able to detect radiation and to transform it into a DC output. Rectennas working in the microwave region have been well established since the sixties, thanks to the availability of Schottky diodes with a suffic...
More recently, detectors based on the HEB mixer geometries (antenna coupled) working as hot electron superconducting transition edge sensors [135] have been proposed. These devices are predicted to have NEPs near 10 W/ Hz [136]. Before leaving the detector area, it is worth mentioning one ...
The primary method for managing this problem is increasing the antenna gain to compensate for these losses. However, most high-gain antennas are not easily steered, so the propagation angle is fixed, which reduces the practicability of the system. As one solution, terahertz wavefront shaping ...
One antenna generates the terahertz beam and a second one acts as THz receiver. Having fiber-coupled rather than free-space antennas means that the antennas can be positioned in any configuration (transmission, reflection, or even move them around). This system is used for high-bandwidth spectros...
Based on the above analysis, the working principle of the proposed antenna element can be explained as shown in Fig.2c. The four top surfaces of the metallic posts work as a pair of electric dipoles along thex-direction. The gap between the four metallic posts and the two gaps between th...
THz-TDS measurements on the films were carried out in transmission mode using a photoconductive antenna-based spectrometer in the spectral energy range of ~0.8–6 meV. A schematic of our spectrometer and its measurement configuration is given in Supplementary Fig. 1. More details about the spe...