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Chirality-detecting–based chiral molecule-metal-chiral molecule structures

We theoretically investigate a method to directly distinguish the chirality of molecules in the reflection spectrum. A metal film is sandwiched between the reference molecules and the tested molecules. Fresnel equations are employed to calculate the reflection spectrum. The reference molecules are adopted as left TDBCs, and both left TDBCs and right TDBCs are taken into account at the tested molecules. The oscillator strength of chiral TDBCs is related with TDBC concentration. By changing the oscillator strength of the reference TDBCs, we find that there is an optimal oscillator strength regime of the reference TDBCs to achieve only one reflection peak for left TDBCs at the end of the tested TDBCs and two reflection peaks for right TDBCs at the end of the tested TDBCs. The optimal oscillator strength regime increases with the increase of the oscillator strength of the tested TDBCs. Our method can easily distinguish the chirality of molecules and has potential applications by the shape of the reflection spectra in the experiments.