Publications by authors named "Ben Beddoes"
Article Synopsis
- - Terahertz time-domain spectroscopy (THz-TDS) offers high signal-to-noise ratios by capturing electric field amplitude over time, providing detailed optical parameters like refractive index, but data extraction remains complex and lacks standardized methods, causing measurement discrepancies.
- - Low frequency noise can interfere with phase reconstruction of signals, and issues like laser power fluctuations lead to measurement errors if not properly managed.
- - The research utilizes ensembles of deep neural networks trained on synthetic data to automatically extract the complex refractive index, overcoming challenges like phase unwrapping and laser drift, and outperforming traditional extraction methods.
Nematic liquid crystals integrated with metallic resonators (metamaterials) are intriguing hybrid systems, which not only offer added optical functionalities, but also promote strong light-matter interactions. In this report, we show with an analytical model that the electric field generated by a conventional oscillator-based terahertz time domain spectrometer is strong enough to induce partial, all-optical switching of nematic liquid crystals in such hybrid systems. Our analysis provides a robust theoretical footing for the mechanism of all-optical nonlinearity of liquid crystals, which was recently hypothesised to explain an anomalous resonance frequency shift in liquid crystal-loaded terahertz metamaterials.
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