Highly precise determination of optical constants in olive oil using terahertz time-domain spectroscopy

Jiusheng Li; Jianquan Yao

doi:10.1117/12.819784

16 February 2009 Highly precise determination of optical constants in olive oil using terahertz time-domain spectroscopy

Jiusheng Li, Jianquan Yao

Author Affiliations +

Proceedings Volume 7277, Photonics and Optoelectronics Meetings (POEM) 2008: Terahertz Science and Technology; 727707 (2009) https://doi.org/10.1117/12.819784
Event: Photonics and Optoelectronics Meetings, 2008, Wuhan, China

Abstract

Recently, there has been a remarkable effort in employing terahertz (THz) spectroscopy for investigating material properties. Pulsed THz time-domain spectroscopy is a coherent technique, in which both the amplitude and the phase of a THz pulse are measured. Coherent detection enables direct calculations of both the imaginary and the real parts of the refractive index without using the Kramers-Kronig relations. In this letter, the terahertz absorption spectra and the refractive indices of olive oil were measured by using terahertz time-domain spectroscopy (THz-TDS) in the frequency range extending from 0.2 to 2.5 THz. The terahertz dielectric properties of olive oil were characterized by THz-TDS, and the consistency with the known parameters was identified. A novel iterative algorithm improves the existing data extraction algorithms and further enhances the accuracy of the parameter extraction for terahertz time-domain spectroscopy. The results obtained in this study suggest that the THz-TDS method is a useful tool for vegetable oils characterization in the far infrared region. This method can be applied not only to terahertz time-domain spectroscopy but also to any kind of optical constant measurement in the time domain.

Citation Download Citation

Jiusheng Li and Jianquan Yao "Highly precise determination of optical constants in olive oil using terahertz time-domain spectroscopy", Proc. SPIE 7277, Photonics and Optoelectronics Meetings (POEM) 2008: Terahertz Science and Technology, 727707 (16 February 2009); https://doi.org/10.1117/12.819784

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