MS Thesis Defense by Sean Rodrigues

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  • Date/Time:
    • Tuesday November 10, 2015 - Wednesday November 11, 2015
      6:00 pm - 7:59 pm
  • Location: MRDC Conference Room 4404, Building # 135
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Summary Sentence: Enhancing chiroptical signals from metamaterials via nonlinear excitation

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MSE MS Thesis Defense – Sean Rodrigues 

Date/Time: Tuesday, November 10th, 2-4 p.m.

Location: MRDC Conference Room 4404, Building # 135


Dr. Wenshan Cai (advisor)(MSE)
Dr. Mohan Srinivasarao (MSE)
Dr. Vladimir Tsukruk (MSE)

Title: “Enhancing chiroptical signals from metamaterials via nonlinear excitation.”


As natural chiral materials demonstrate limited circularly dichroic contrasts, enhancement of these polarization dependent signals has long been the focus of chiral metamaterial research. By manipulating the geometric chirality of resonant plasmonic nanostructures, we are capable of enhancing light confinement to amplify chiral modified, nonlinear signals from quantum emitters. The metamaterial demonstrates a linear transmission contrast of 0.5 between left and right circular polarizations and a 20× contrast between second harmonic responses from the two incident polarizations. Nonlinear and linear response images probed with circularly polarized lights show strongly defined contrast. As a second set of experimentation, the chiral center of the metamaterial is opened, providing direct access to place emitters to occupy the most light-confining and chirally sensitive regions. The resulting two-photon emission profiles from circularly polarized excitation displays mirrored symmetry for the two enantiomer structures. The efficiency of the nonlinear signal directly correlates to the chiral resonance of the linear regime. The nonlinear emission signal is enhanced by 40× that of the emitters not embedded in the metamaterial and displays a 3× contrast for the opposite circular polarization. Such manipulations of nonlinear signals with metamaterials open pathways for diverse applications where chiral selective signals are monitored, processed, and analyzed.

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  • Created By: Tatianna Richardson
  • Workflow Status: Published
  • Created On: Nov 3, 2015 - 4:07am
  • Last Updated: Oct 7, 2016 - 10:14pm