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submitted on 06.01.2018 and posted on 08.01.2018by Xiang-Tian Kong, Larousse Khosravi Khorashad, Zhiming Wang, Alexander O. Govorov
Chiral photochemistry remains a challenge
because of the very small asymmetry in the chiro-optical absorption of
molecular species. However, we think that the rapidly developing fields of
plasmonic chirality and plasmon-induced circular dichroism demonstrate very
strong chiro-optical effects and have the potential to facilitate the
development of chiral photochemistry and other related applications such as
chiral separation and sensing. In this study, we propose a new type of chiral
spectroscopy – photothermal circular dichroism. It is already known that the
planar plasmonic superabsorbers can be designed to exhibit giant circular
dichroism signals in the reflection. Therefore, upon illumination with chiral
light, such planar metastructures should be able to generate a strong asymmetry
in their local temperatures. Indeed, we demonstrate this chiral photothermal effect
using a chiral plasmonic absorber. Calculated temperature maps show very strong
photothermal circular dichroism. One of the structures computed in this paper could
serve as a chiral bolometer sensitive to circularly polarized light. Overall, this
chiro-optical effect in plasmonic metamaterials is much greater than the
equivalent effect in any chiral molecular system or plasmonic bio-assembly. Potential
applications of this effect are in polarization-sensitive surface photochemistry and chiral bolometers.