  We present a comprehensive review of recent developments in the field of
chiral plasmonics. Significant advances have been made recently in
understanding the working principles of chiral plasmonic structures. With
advances in micro- and nanofabrication techniques, a variety of chiral
plasmonic nanostructures have been experimentally realized; these tailored
chiroptical properties vastly outperform those of their molecular counterparts.
We focus on chiral plasmonic nanostructures created using bottom-up approaches,
which not only allow for rational design and fabrication but most intriguingly
in many cases also enable dynamic manipulation and tuning of chiroptical
responses. We first discuss plasmon-induced chirality, resulting from the
interaction of chiral molecules with plasmonic excitations. Subsequently, we
discuss intrinsically chiral colloids, which give rise to optical chirality
owing to their chiral shapes. Finally, we discuss plasmonic chirality, achieved
by arranging achiral plasmonic particles into handed configurations on static
or active templates. Chiral plasmonic nanostructures are very promising
candidates for real-life applications owing to their significantly larger
optical chirality than natural molecules. In addition, chiral plasmonic
nanostructures offer engineerable and dynamic chiroptical responses, which are
formidable to achieve in molecular systems. We thus anticipate that the field
of chiral plasmonics will attract further widespread attention in applications
ranging from enantioselective analysis to chiral sensing, structural
determination, and in situ ultrasensitive detection of multiple disease
biomarkers, as well as optical monitoring of transmembrane transport and
intracellular metabolism.
