Terahertz generation from laser-induced plasma

Abstract

Interest of the research in terahertz (THz) wave has been strongly motivated by its wide applications in the fields of physics, chemistry, biology, and engineering. Developing efficient and reliable THz source is of uttermost priority in these researches. Numerous attempts have been made in fulfilling the THz generation. Greatly benefited from the progress of the ultrafast pulses, the laser-induced-plasma is one of the auspicious tools to provide desirable THz waves, owing to its superiorities in high power threshold, intense THz signal, and ultrawide THz spectrum. This paper reviews the physics and progress of the THz generation from the laser-induced plasmas, which are produced by gas, liquid, and solid. The characteristics of the emitted THz waves are also included. There are many complicated physical processes involved in the interactions of laser-plasma, making various laser-plasma scenarios in the THz generations. In view of this, we will only focus on the THz generation classified by physical mechanisms. Finally, we discuss a perspective on the future of THz generation from the laser-induced plasma, as well as its involved challenges.

Metamaterial terahertz device with temperature regulation function that can achieve perfect absorption and complete reflection conversion of ultrawideband

“…These advancements have been pivotal in expediting the growth and exploration of terahertz absorbers. Terahertz absorbers have immense potential for various applications, including fingerprint detection [14,15], biomedicine [16,17], electromagnetic stealth [18,19], sensing [20,21], process control and monitoring [22], modulators [23,24], communication [25], and coding [26]. However, most of the metamaterials currently used have poor performance, and devices designed based on them have a single function and lack adjustability.…”

Generation of terahertz radiation by a Hermite–Gaussian laser beam inside magnetoplasma with a density ramp

“…Laser–plasma interaction has led to many developments in terahertz generation (Sobhani, Dadar & Feili 2017; Sun, Wang & Zhang 2022), second-harmonic generation (Upadhyay & Tripathi 2005; Sharma, Thakur & Kant 2020), plasma-wakefield excitation for particle acceleration (Kim et al 2021; Kad & Singh 2022 b ), etc. Plasma being a nonlinear medium has an extraordinarily high damage threshold, and is thus capable of sustaining a high-intensity electric field (Hassan et al 2012).…”

Why do terahertz waves generated from long two-color filament always peak at around 1 THz?

“…5 Recently, some review papers have discussed comprehensively the state-of-the-art advances of this field. 6,7 However, the lack of the frequency selecting and tuning methods for this source impedes its wider application. Some efforts have been made to achieve the frequency tunable THz source, for instance, by using two filaments 8,9 or adding the external cavity.…”