Electro-optical detection of terahertz radiation in a zinc sulphide crystal at a wavelength of 512 nm

Abstract

The electro-optical sampling method is a widely used technique for the detection of terahertz (THz) waves. During the last thirty years, various electro-optical sensors have been proposed, but mainly working with a near-infrared probe. Here we demonstrate efficient detection of terahertz radiation up to 2.5 THz using a (110)-cut zinc sulfide (ZnS) crystals with the second harmonic of an amplified solid-state ytterbium laser beam at 512 nm. To validate its characteristics, we compare its performance with that of the cadmium telluride (CdTe) crystal probed at the fundamental wavelength of the laser.

Theoretical Investigation on the Mechanism and Law of Broadband Terahertz Wave Detection Using Rydberg Quantum State

“…In the past forty years, terahertz radiation sources and detectors has made great development. Combing with the coherent detection, more and more detection technologies such as photoconductive antennas [7], electrooptical crystals [8], and air detection [9], [10] have gradually matured. The phase information of the electric field is obtained on the basis of the original detection relative intensity, and the minimum detectable power is also getting smaller and smaller.…”

Parallel generation and coding of a terahertz pulse train

“…O cially, since 2019, the terahertz (THz) band (> 100 GHz) has been considered the next frontier of wireless communications for Beyond-5G (B5G) and 6G networks, more speci cally, for the frequency range between 95 GHz and 3 THz [1]. Although this o cial status was only granted recently, researchers have been actively exploring this range of electromagnetic frequencies for decades [2,3], and in the process, have realized considerable progress in generating [4][5][6][7][8] and detecting [9][10][11][12] these waves to satisfy various application areas, including ultrafast spectroscopy [5,13,14], biomedicine [15,16] and security [17,18]. More recently, THz communications have received a lot of attention [19][20][21],…”

Broadband heterodyne electro-optic sampling using a lithium niobate ridge-waveguide

“…1) For instance, recent developments in Ytterbium (Yb) lasers operating at 1040 nm are emerging as a convincing alternative to Ti: sapphire (800 nm) lasers for the efficient generation of THz waves. 2) To detect these waves, new EO sampling schemes have been demonstrated at the fundamental and harmonic wavelengths of the Yb laser, using cadmium telluride (CdTe) 3) and zinc sulfide (ZnS), 4) respectively. However, these crystals present limitations, such as strong absorption at 2.1 THz in CdTe 3) and poor crystal uniformity for ZnS.…”

“…However, these crystals present limitations, such as strong absorption at 2.1 THz in CdTe 3) and poor crystal uniformity for ZnS. 4) In addition, these crystals do not operate at the wavelength of the Ti:Sapphire laser. This type of problem highlights the importance of identifying new, more efficient EO detection materials, or better still, exploring sensor geometries that depend as little as possible on probe wavelength.…”