Tailoring single-cycle electromagnetic pulses in the 2-9 THz frequency range using DAST/SiO2 multilayer structures pumped at Ti:sapphire wavelength

TL;DR

This study demonstrates how multilayer DAST/SiO2 structures can be numerically optimized to generate tunable, efficient single-cycle THz pulses in the 3-6 THz range using femtosecond laser pulses at 800 nm.

Contribution

It introduces a numerical method to tailor multilayer DAST/SiO2 structures for efficient, tunable THz pulse generation with enhanced energy conversion compared to bulk and periodically poled DAST.

Findings

Tuning layer thicknesses adjusts the THz frequency from 3 to 6 THz.

Multilayer structures show higher energy conversion efficiency.

Significant enhancement over bulk and periodically poled DAST.

Abstract

We present a numerical parametric study of single-cycle electromagnetic pulse generation in a DAST/SiO2 multilayer structure via collinear optical rectification of 800 nm femtosecond laser pulses. It is shown that modifications of the thicknesses of the DAST and SiO2 layers allow tuning of the average frequency of the generated THz pulses in the frequency range from 3 to 6 THz. The laser-to-THz energy conversion efficiency in the proposed structures is compared with that in a bulk DAST crystal and a quasi-phase-matching periodically poled DAST crystal and shows significant enhancement.