Abstract
A strong chiral near-field is crucial for the detection of chiral molecules. Active tuning of the chiral near-field can shorten the detection process. In this study, a graphene-based achiral nanoring (GAN) that can actively control chiral near-fields is presented. The GAN is composed of three identical graphene pieces. The handedness and strength of the chiral near-fields can be actively controlled by adjusting the Fermi levels of these three graphene pieces. The optical chirality of the GAN near-field is 500 times that of circularly polarized light. In addition, the GAN enhances the chiral response of the chiral material by a factor of 250. This work provides opportunities for the ultrasensitive detection and location of molecules through the active control of chiral near-fields.
Highlights
Chirality is a characteristic exhibited by molecules with non-superimposable mirror images [1]
Given that the dimensions of the chiral molecules are smaller than the helical pitch of circularly polarized (CP) light, their intrinsic chiral response is weak [3]
The chiral response of the material is enhanced by two orders of magnitude in the presence of the graphenebased achiral nanoring (GAN). This result provides opportunities for the active control of optical chirality, which can lead to the ultrasensitive probing and localization of chiral molecules
Summary
Chirality is a characteristic exhibited by molecules with non-superimposable mirror images [1]. Chiral molecules are of great importance in nature [2, 3] Chiral response, such as circular dichroism, is an optical property of chiral structures that causes them to interact differently with left circularly polarized (LCP, + ) light and right circularly polarized (RCP, −) light. Graphene is an excellent choice of material for the active control of optical properties because its permittivity functions can be tailored by external gate voltages [21,22,23,24]. This result provides opportunities for the active control of optical chirality, which can lead to the ultrasensitive probing and localization of chiral molecules
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