“School of Nano-Sciences”
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| Paper IPM / Nano-Sciences / 17956 |
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| Abstract: | |||||
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Chiral molecules are ubiquitous. In areas such as drug synthesis and purification, the ultrasensitive detection of small quantities of enantiomers using conventional instrumentation is highly required. Here, we study the scattering of a linearly polarized plane wave by a metallic or dielectric nanoparticle coated with a layer of chiral molecules. The azimuth and ellipticity angles, which characterize the polarization ellipse of the scattered light, depend on the scattering angle. We theoretically show a large optical activity at visible wavelengths when the scattering angle is around 90. For instance, a 1 nm chiral layer coated on a 20 nm radius silicon nanoparticle immersed in water results in azimuth angles about 5 - 21 for wavelengths 640 - 720 nm. Such a large optical activity is a strong signature of chirality.
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