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【lecture】Nonlinear chiroptical effects for sensing chiral pollutants in the environment
Published:2015-08-15 Hits:557

Speaker: Dr Ventsislav K. Valev

        V. K. Valev is a Research Fellow of the Royal Society and Reader in the Physics Department of the University of Bath, United Kingdom. He was a Research Fellow in the Cavendish Laboratory, at the University of Cambridge, and was associated with Homerton College. He has published over 65 papers in journals such as Nat. Comm., Phys. Rev. Lett., Adv. Mater. Etc.
       Chiral plasmonic nanostructures are emerging as a very promising branch of nanomaterials, with numerous potential applications, including in the detection of chiral pollutants (ex. pesticides) in the environment. Recently, so called "superchiral" electromagnetic configurations have been demonstrated, whereby the pitch of the electric field of light is shorter than that of circularly polarized light. These configurations can lead to enhanced chiroptical interactions with
matter. Furthermore, due to the favorable power‐law scaling of near‐field enhancements, new nonlinear optical properties are emerging in chiral meat‐ and nanomaterials as well.
        Optical second harmonic generation (SHG) can be surface/interface‐sensitive down to the atomic monolayer, its signal being greatly enhanced by the presence of surface plasmons. The chiroptical effects in SHG are typically three orders of magnitude larger than their linear optical counterparts. It has now been demonstrated that superchiral.
Time: August 27th (Wednesday), 10:30 am
Venue: Room 226, Department of Environmental Science and Engineering


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