October 06, 2009
One of the significant impacts of Nanoscience & Nanotechnology is to offer opportunity for manipulating and fabricating artificial; nanostructures (that might not even exist in our mother nature) with desired property and functionality. In this talk, I will present a few recent progresses from my research group to highlight this. I will start from materials view point and show how to achieve meticulous control of nanostructures including morphology, defect, crystallinity and compositions based on bottom-up chemical synthetic strategy. Enabled by such, fundamental physics properties such as photonic, electronic, mechanic and spintronic interactions can be finely tailored at the nanoscale. Uniquely combined with our achievement of nanomaterials control different ultrafast laser spectroscopic techniques have been applied to probe fine coupling interactions within as-synthesized nanostructures. If time allowed, I will further focus on two examples: (1) electron-phonon and phonon-phonon interactions within nanostructures. Role of defects on modifying such fundamental interactions will be discussed, and I will also show how these coupling interactions can be precisely tuned by controlling dielectric confinement of nanostructures; (2) light-matter-spin interaction at the nanoscale. I will show how quantum confinement can tailor spin properties of nanostructures. And more significantly light-matter interaction can be engineered by artificial nanostructures and thus can be applied to manipulate spin through such as optical Stark effect at the nanoscale.
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Colloquia are held Tuesdays in Room 1410 at 4:00 pm (preceded by light refreshments at 3:30). If you have additional questions, please call 301-405-5946.
