Chiral molecules that do not superimpose on their mirror images are the foundation of all life forms on earth.Chiral molecules exhibit chiroptical responses,i.e.,they have different electromagnetic responses to light ...Chiral molecules that do not superimpose on their mirror images are the foundation of all life forms on earth.Chiral molecules exhibit chiroptical responses,i.e.,they have different electromagnetic responses to light of different circular polarizations.However,chiroptical responses in natural materials,such as circular dichroism and optical rotation dispersion,are intrinsically small because the size of a chiral molecule is significantly shorter than the wavelength of electromagnetic wave.Conventional technology for enhancing chiroptical signal entails demanding requirements on precise alignment of the chiral molecules to certain nanostructures,which however only leads to a limited performance.Herein,we show a new approach towards enhancement of chiroptical effects through a Fabry-Pérot(FP)cavity formed by two handedness-preserving metamirrors operating in the GHz region.We experimentally show that the FP cavity resonator can enhance the optical activity of the chiral molecule by an order of magnitude.Our approach may pave the way towards state-of-the-art chiral sensing applications.展开更多
基金This work was supported by the International Science and Technology Cooperation Programme of China(grant no.2015DFG12630)T.C.acknowledges support from the Program for Liaoning Excellent Talents in University(grant no.LJQ2015021).
文摘Chiral molecules that do not superimpose on their mirror images are the foundation of all life forms on earth.Chiral molecules exhibit chiroptical responses,i.e.,they have different electromagnetic responses to light of different circular polarizations.However,chiroptical responses in natural materials,such as circular dichroism and optical rotation dispersion,are intrinsically small because the size of a chiral molecule is significantly shorter than the wavelength of electromagnetic wave.Conventional technology for enhancing chiroptical signal entails demanding requirements on precise alignment of the chiral molecules to certain nanostructures,which however only leads to a limited performance.Herein,we show a new approach towards enhancement of chiroptical effects through a Fabry-Pérot(FP)cavity formed by two handedness-preserving metamirrors operating in the GHz region.We experimentally show that the FP cavity resonator can enhance the optical activity of the chiral molecule by an order of magnitude.Our approach may pave the way towards state-of-the-art chiral sensing applications.
