Enhanced molecular orientation via NIR-delay-THz scheme: Experimental results at room temperature

TL;DR

This paper demonstrates an experimental scheme combining near-infrared and terahertz pulses to significantly enhance molecular orientation in gas phase at room temperature, supported by theoretical simulations.

Contribution

It introduces a novel NIR-THz excitation method that overcomes previous limitations in molecular orientation efficiency at room temperature.

Findings

Significant increase in molecular orientation achieved

Experimental results align with theoretical simulations

Enhanced orientation observed at room temperature

Abstract

THz fields induce orientation in gas phase molecules via resonant dipole-field interaction. The degree of orientation however remains severely limited due to the practical shortage of high THz-field amplitudes. In this paper, we experimentally demonstrate a concerted Near-IR and THz excitation scheme that provides significant increase in the degree of orientation at room temperature gas ensembles. The experimental results are supported by theoretical simulations and a detailed discussion of the multiple coherent transition pathways involved in the scheme is presented.