Optical fiber Sagnac干涉仪用于标量定向折射的检测：应用于磁手征双折射
Optical fiber Sagnac interferometer for sensing scalar directional refraction: application to magnetochiral birefringence
摘要：
我们提出了一个装置，专门用于测量与磁手征相互作用相关的小标量方向各向异性。该装置，基于偏振无关的光纤Sagnac干涉仪，被优化为对圆各向异性和残余吸收不敏感。因此，它可以表征生物学感兴趣的样品，其中两种对映异构体不可用和/或呈现差的传输。示出的信噪比仅受源强度噪声的限制，导致检测限Df = 500 nrad.Hz-1/2。对于所测试的有机分子，其在1550 nm处的磁手性指数nMC < 4 × 10-13 T-1的极限。
英文摘要：
We present a set-up dedicated to the measurement of the small scalar directional anisotropies associated to the magnetochiral interaction. The apparatus, based on a polarization-independent fiber Sagnac interferometer, is optimized to be insensitive to circular anisotropies and to residual absorption. It can thus characterize samples of biological interests, for which the two enantiomers are not available and/or which present poor transmission. The signal-to-noise ratio is shown to be limited only by the source intensity noise, leading to a detection limit of Df = 500 nrad.Hz-1/2. It yields a limit on the magnetochiral index nMC < 4 10-13 T-1 at 1550 nm for the organic molecules tested.
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