分类: 光学 >> 量子光学 提交时间: 2023-02-19
摘要: Locally chiral light (LCL) is a promising tool for probing and controlling molecular chirality. The pioneering tricolor LCLs' degrees of chirality (DOCs) change periodically in space and vanish by integrating over the whole spatial period, making them cease to be globally effective (i.e., globally achiral). Locally and globally chiral light (LGCL) is a type of more efficient LCL whose DOCs survive by integrating but still change periodically in space. Here, we propose a scheme to generate a new type of LCL called uniformly locally chiral light (ULCL). ULCLs are globally chiral and have spatially uniform DOCs, which makes them superior to current types of LCLs in studies of chiral molecules. By applying the ULCLs in an optical molecular-chirality switch, the racemic mixtures can be converted to enantiopure samples without size restrictions, where the perfect control of molecular chirality with a global efficiency of $100\%$ is predicted, which is twice that of LGCLs. Our work potentially constitutes the starting point for developing more efficient chiroptical techniques for probing and controlling molecular chirality.
分类: 光学 >> 量子光学 提交时间: 2023-02-19
摘要: We propose an enantio-detection method of chiral molecules in a cavity with external drive. The chiral molecules are coupled with a quantized cavity field and two classical light fields to form the cyclic three-level systems. The chirality-dependent cavity-assisted three-photon process in the three-level systems leads to the generation of intracavity photons. Simultaneously, the drive field also results in the chirality-independent process of the generation of intracavity photons. Based on the interference between the intracavity photons generated from these two processes, one can detect the enantiomeric excess of chiral mixture via monitoring the transmission rate of the drive field.
分类: 光学 >> 量子光学 提交时间: 2023-02-19
摘要: We propose a method for enantio-detection of chiral molecules based on a cavity-molecule system, where the left- and right-handed molecules are coupled with a cavity and two classical light fields to form cyclic three-level models. Via the cavity-assisted three-photon processes based on the cyclic three-level model, photons are generated continuously in the cavity even in the absence of external driving to the cavity. However, the photonic fields generated from the three-photon processes of left- and right-handed molecules differ with the phase difference {\pi} according to the inherent properties of electric-dipole transition moments of enantiomers. This provides a potential way to detect the enantiomeric excess of chiral mixture by monitoring the output field of the cavity.