Chirality enhancement of TDBCs by inorganic perovskite–metal hybridized grating

We design a hybridized structure to enhance the chirality of TDBCs based on inorganic perovskites (CsPbBr3) and surface plasmon polaritons (SPPs). Silver film is considered as the substrate and CsPbBr3 is used as the material of the groove. Chiral TDBCs is coated at the top of the hybridized structure. First principle calculation is used to calculate the characteristics of CsPbBr3, and Finite difference time domain method is employed to simulate our proposed hybridized structure. For comparison, we also calculate the structure with CsPbBr3 substrate. Our results show that there is a broadband non-zero line in circular dichroism (CD) spectrum for all calculation models. The maximum value of the structure with CsPbBr3 substrate is as 75 times as the one of only TDBCs. With the help of SPPs, the maximum value of the structure with Ag substrate is as 270 times as the one of only TDBCs. We also calculate the area formed by CD curve and the axis (SCD) to further describe the enhancement of the chirality in the whole wavelength regime. There is an optimal lattice constant to make SCD the largest. This result of the competition between the dissipation of CsPbBr3 is affected by the size and the coupling between the hybridized grating and TDBCs. Our proposed structure shows a well chirality enhancement and a broadband working wavelength, which has potential applications in chirality detecting.