Dipartimento di Fisica, Università della Calabria, I-87036, Rende, Italy.
Opt Lett. 2010 Jun 1;35(11):1822-4. doi: 10.1364/OL.35.001822.
We propose a simple method to perform real-time measurements of circular dichroism (CD), which suppresses the artifacts introduced by anisotropic samples and nonideal optical elements in conventional spectrometers. A single polarization holographic grating is adopted, whose first orders of diffraction have amplitudes that are proportional to the right and left circular polarization component of the input light. We demonstrate that, exploiting unpolarized white light and the intrinsic spectral selectivity of the grating, the true CD spectrum is evaluated in parallel in the spectral range of interest from the intensities of the two diffraction orders, I(+1) and I(-1).
我们提出了一种简单的方法来实时测量圆二色性（CD），该方法可以抑制传统光谱仪中各向异性样品和非理想光学元件引入的伪影。采用单偏振全息光栅，其一级衍射的幅度与输入光的右圆偏振和左圆偏振分量成正比。我们证明，利用非偏振白光和光栅的固有光谱选择性，可以从两个衍射级的强度 I(+1) 和 I(-1) 中并行评估感兴趣光谱范围内的真实 CD 光谱。
