Speaker
Description
Identifying the handedness of chiral molecules is of fundamental importance in chemistry, biology,pharmacy, and medicine. In this work, we predict the chiroptical response of a dielectric metasurface engineered to amplify molecular circular dichroism (CD) using a general electromagnetic theory of chiral light-matter interaction in arbitrary resonators. The idea behind this theory is the ability to reconstruct the optical response (i.e., transmission, reflection and absorption) from a system via its resonant states. We derive a recipe to maximize a particular mechanism of chiral light-matter interaction, namely, the modal crosstalk, by supporting two nearly degenerate, high-quality-factor resonant states known as quasi-bound states in the continuum. Our theoretical and numerical analysis predicts a pronounced differential transmittance ΔT that exceeds the detection threshold of standard spectrometers. For the proposed metasurface, the differential transmittance approximately equals CD and can be measured in experiment directly. Moreover, we provide several strategies to decrease the computational time of numerical simulations without loss of physics.