OSE Seminar with Dr. Terefe Habteyes on Plasmonic coupling in sub-nanometer separation distances How important is quantum mechanical effect?
Posted: January 30, 2019
Date: Thursday, January 31, 2019
Time: 11:00 AM to Noon
Location: Physics and Astronomy Building, Rm. 190
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Dr. Terefe Habteyes
UNM Chemistry and Chemical Biology Department
Localized surface plasmon resonances of metal nanostructures are very attractive optical properties to localize and enhance surface fields to increase light-matter interaction. Local field enhancement that is sufficient for single molecule detection can be obtained by coupling two or more nanostructures in close proximity. According to the prediction of classical electrodynamics, the field enhancement continuously increases with decreasing separation distance to the touching limit. However, when the separation distance is less than 0.5 nm, quantum mechanical effect (electron tunneling) can be important. In this presentation, first the near-field and far-field properties of localized surface plasmon resonances as well as their applications in spectroscopy and photochemistry will be briefly introduced. Then, the transition of plasmonic optical responses from capacitive gap plasmon resonances to tunneling and to direct conductive coupling will be discussed based on recent experimental observations in Habteyes research group.