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Optical Activity of Chiral Nanomaterials: Effects of Short Range and Long Range Electromagnetic Interactions

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2014, Doctor of Philosophy (PhD), Ohio University, Physics and Astronomy (Arts and Sciences).
In this dissertation, chiral nanomaterials with new plasmonic properties have been investigated. Electromagnetic interactions between well-defined building blocks in nanomaterials are modeled using classical and quantum mechanical theories. We predict several new mechanisms of plasmonic circular dichroism (CD) signals in chiral nanomaterials. The predicted CD mechanisms include plasmon-plasmon interactions of nanoparticle assemblies, plasmon-exciton interactions of molecule-nanoparticle conjugates, multipole plasmon mixing in chiral metal nanocrystals and electrodynamic effect of long range plasmon-exciton interactions. It is efficient and accurate to simulate light-matter interactions with analytic solutions. However, only a limited number of geometries can be solved analytically. Many numerical tools based on finite element methods, discrete dipole approximation or finite-difference time-domain methods are available currently. These methods are capable of simulating nanostructures with arbitrary shapes. Numerical simulations using such software have shown agreements with analytical results of our models. Hence, this study may offer a new approach to design of complex nanostructures for sensing of chiral molecules. This dissertation also reviews several experimental papers that have demonstrated successful fabrications of chiral nanostructures and nano-assemblies with new plasmonic CD signals. Our theories strongly motivated the field and have been used in many experimental studies for interpretation and understanding of observations.
Alexander Govorov (Advisor)
Eric Stinaff (Committee Member)
Horacio Castillo (Committee Member)
Wojciech Jadwisienczak (Committee Member)
138 p.

Recommended Citations

Citations

  • Fan, Z. (2014). Optical Activity of Chiral Nanomaterials: Effects of Short Range and Long Range Electromagnetic Interactions [Doctoral dissertation, Ohio University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1394998277

    APA Style (7th edition)

  • Fan, Zhiyuan. Optical Activity of Chiral Nanomaterials: Effects of Short Range and Long Range Electromagnetic Interactions . 2014. Ohio University, Doctoral dissertation. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1394998277.

    MLA Style (8th edition)

  • Fan, Zhiyuan. "Optical Activity of Chiral Nanomaterials: Effects of Short Range and Long Range Electromagnetic Interactions ." Doctoral dissertation, Ohio University, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1394998277

    Chicago Manual of Style (17th edition)