Penn Researchers Break Light-Matter Coupling Strength Limit in Nanoscale Semiconductors

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Penn Researchers Break Light-Matter Coupling Strength Limit in Nanoscale Semiconductors
Description Research at the University of Pennsylvania demonstrates that polaritons have increased coupling strength when confined to nanoscale semiconductors. This represents a promising advance in the field of photonics: smaller and faster circuits that use light rather than electricity. The research was conducted by assistant professor Ritesh Agarwal, postdoctoral fellow Lambert van Vugt and graduate student Brian Piccione of the Department of Materials Science and Engineering in Penn’s School of Engineering and Applied Science. Chang-Hee Cho and Pavan Nukala, also of the Materials Science department, contributed to the study.

The team used self-assembled cadmium sulfide nanowires, but discovered that surface quality was still a limiting factor. So, the team developed techniques of surface passivation and grew a silicon oxide shell on the surface of the wires, which greatly improved their optical properties. The oxide shell fills the electrical gaps in the nanowire surface, preventing the excitons from getting trapped.

Their work was published in the journal Proceedings of the National Academy of Sciences.

Imported on 18 Jun 2011, 10:31
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