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Noninvasive Imaging of Spin Currents Using Nonlinear Optical Effects

Explore a new technique for imaging spin currents without direct detection, based on second-harmonic generation. This innovative approach offers noninvasive and ultrafast imaging capabilities for materials research. Potential applications in photonics and spintronics integration. Published research by Hui Zhao and team at the University of Kansas Center for Research Inc. This project has broader impacts including enhancing research infrastructure and providing training opportunities.

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Noninvasive Imaging of Spin Currents Using Nonlinear Optical Effects

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  1. 750nm 1500nm New Light from Spin CurrentsHui Zhao, University of Kansas Center for Research Inc, DMR 0954486 We observed a second-harmonic generation process induced by pure spin currents. The second-order nonlinear susceptibility is proportional to the density of the current. Currently, there is no technique available for direct detection of spin currents in semiconductors. Study of spin currents rely on detecting current-induced spin accumulations. The demonstrated nonlinear optical effect can be used for noninvasive, nondestructive, and ultrafast imaging of spin currents in a wide range of materials. The control of nonlinear optical properties of materials with pure spin currents may have potential applications in photonics integrated with spintronics. Werake and Zhao, Nature Physics, Advanced online publication on 08/08/2010. Conduction band SH Fundamental Valence band

  2. Broader ImpactsHui Zhao, University of Kansas Center for Research Inc, DMR 0954486 • The award allows the PI to build a new research program of ultrafast lasers at the University of Kansas. The new ultrafast laser lab enhanced the research infrastructure of the University of Kansas • The research provides training opportunities for three graduate students and two undergraduate students at the University of Kansas. • Research results presented at an International conference. • Ultrafast laser lab supported experimental part of an undergraduate course.

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