Journal
OPTICS EXPRESS
Volume 17, Issue 22, Pages 20567-20574Publisher
OPTICAL SOC AMER
DOI: 10.1364/OE.17.020567
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Funding
- Japan Society for the Promotion of Science (JSPS) [20360025]
- Grants-in-Aid for Scientific Research [20360025] Funding Source: KAKEN
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We demonstrate the coherent transfer of optical orbital angular momentum (OAM) to the center of mass momentum of excitons in semiconductor GaN using a four-wave mixing (FWM) process. When we apply the optical vortex (OV) as an excitation pulse, the diffracted FWM signal exhibits phase singularities that satisfy the OAM conservation law, which remain clear within the exciton dephasing time (similar to 1ps). We also demonstrate the arbitrary control of the topological charge in the output signal by changing the OAM of the input pulse. The results provide a way of controlling the optical OAM through carriers in solids. Moreover, the time evolution of the FWM with OAM leads to the study of the closed-loop carrier coherence in materials. (C) 2009 Optical Society of America
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