Abstract
Chiral plasmonic nanostructures enable ≤pg detection and characterization of biomaterials. The sensing capabilities are associated with the chiral asymmetry of the near fields, which locally can be...
Highlights
The detection and characterization of inherently chiral biological materials is of both fundamental and practical interest, with applications in life and analytical sciences. This is achieved using chirally sensitive spectroscopic techniques which are based on the differential interaction of circularly polarized light (CPL), such as circular dichroism (CD) and optical rotatory dispersion (ORD).[1,2]
We present evidence that suggests that the sensing capability of a chiral structure is correlated to a chiral dielectric-induced asymmetry in the capacities of leftand right-handed forms to convert the chirality of light into chiral surface charge distributions, a process referred to as the dissipation of optical chirality.[15,16]
To account for this asymmetry, we propose a previously unconsidered mechanism of optical chirality dissipation based on the interference between chiral fields generated by spatially separated sources
Summary
The detection and characterization of inherently chiral biological materials is of both fundamental and practical interest, with applications in life and analytical sciences This is achieved using chirally sensitive spectroscopic techniques which are based on the differential interaction of circularly polarized light (CPL), such as circular dichroism (CD) and optical rotatory dispersion (ORD).[1,2] Because of the inherent weakness of the asymmetric interaction of CPL, chiroptical techniques require relatively large amounts of samples, that is, ≥μg.[3] This precludes the use of these chiroptical techniques for applications for which ultrasensitivity (
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