新一代商业化研究级太赫兹光谱仪

手性材料的太赫兹光谱鉴别

1. Why chirality analysis important The analysis of chiral molecules is of central importance to modern day chemistry, biochemistry [1] and material science [2-4]. Enantiomeric purity is as paramount as chemical purity to the pharmaceutical industry [5]. Related to this is the optical purity of chiral catalysts and the resulting enantiomeric excess measurements necessary to evaluate synthetic transformations. Analytical techniques capable of surveying chirality have also been used to elucidate reaction mechanisms [1]. More recently materials including polymers [6] as well as supramolecular assemblies and switches [7-10] employing chiral elements have given rise to differential behavior with matter and energy. These initial reports may pave the way for molecular machines and data storage devices that use chirality. On a macromolecular scale, discrete proteins, DNA, RNA, polysaccharides and complexes of these biomolecules are routinely analyzed using chiral optical techniques to gain insight into their threedimensional structural features, most notably their helicity [1].

太赫兹光谱在生物领域应用

Terahertz Radiation The ‘terahertz gap’ encompasses frequencies from ~0.3 THz to ~10 THz (Fig. 1) in the electromagnetic spectrum, lying between microwave and infrared. The radiation (T-Ray) in this band is invisible to the naked eye. Unlike X-ray, terahertz radiation is intrinsically safe, non-destructive and non-invasive. It creates a powerful spectroscopic and imaging technique for characterizing molecular structures. Terahertz spectroscopy enables 3D imaging of structures and materials, and the measurement of the unique spectral fingerprints of different chemical and physical forms.

太赫兹技术的分子光谱表征

Electro-optic terahertz generation The electro-optic (EO) method of terahertz generation is advantageous because the pump-terahertz conversion is not limited either by emission saturation or heat dissipation. The EO route main mechanisms include EO rectification (EOR) and difference frequency generation (DFG). Of these, EOR depends on the introduction of an ultrafast (femtosecond) laser pulse into the lattice of an electrooptically active material; the lattice acts as a rectifier to convert the very high frequency derived from the ultrafast laser pump to a relatively lower frequency pulse that falls in the terahertz range—the socalled EOR effect.

TeraSpectraBrochure-Brouchure

高性能产品特色 得益于下一代枝状太赫兹源技术，使得TeraSpectra 太赫兹光谱仪具有最高性能的同时， 大大降低了成本。并且摒弃了笨重的激光源与繁杂的光路调节，使用户专注于应用而非仪器 调节和维护 高功率专利光源拓展了光谱测量范围，使得探测诸多样品与应用成为可能。 透射与反射测量模式 固体, 液体与气体样品 高信噪比 非标记表征. 室温环境操作 高稳定， ~1” 直径光束均匀照射。光束可聚焦（可选） 温度与环境控制样品仓（可选）