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CAREER: Microscopic Study of Light Localization Hui Cao, Northwestern University, DMR-0093949

CAREER: Microscopic Study of Light Localization Hui Cao, Northwestern University, DMR-0093949. Phys. Rev. Lett. 94 , 226101 (2005).

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CAREER: Microscopic Study of Light Localization Hui Cao, Northwestern University, DMR-0093949

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  1. CAREER: Microscopic Study of Light Localization Hui Cao, Northwestern University, DMR-0093949 Phys. Rev. Lett. 94, 226101 (2005) A surface plasmon represents a collective excitation of electrons. While its frequency is in the visible range, its wavelength can be as short as that of X-ray. Hence, surface plasmons play an important role in nano-optics. Using the near-field scanning optical microscopy, we have observed strong localization of surface plasmons in metal-dielectric nano-composites. The localization results in a buildup of huge electromagnetic field in the nano-scale. Such large local field can enhance various linear and nonlinear optical processes such as Raman or hyper-Raman scattering, wave mixing. Measured near-field intensity distribution in random metal-dielectric nano composites excited by an external light at l=543nm.The red spots represent localization of surface plasmons. Both axes are in the unit of pixel (33 nm).

  2. CAREER: Microscopic Study of Light Localization Hui Cao, Northwestern University, DMR-0093949 Education: One undergraduate Jaclyn Nesbitt, one graduate student Heeso Noh, two postodoc fellows Katyayani Seal and Alexey Yamilov have contributed to this work. Heeso Noh recently become a Ph.D. candidate. Alexey Yamilov joined the Department of Physics at University of Missouri as a junior faculty in September 2005. Societal Impact: The ability to localize light in a microscopic region is very important to the development of nano-scale photonic devices. Strong buildup of electromagnetic energy in the nano-scale has potential application in ultra-sensitive detection of single molecules.

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