4 November 2010 Backward propagation of light pulse in phthalocyanin gallium PMMA at room temperature
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Abstract
Light speed control had been an interesting issue in recent years. In this work, the authors experimentally observed the backward propagation of light pulse in Phthalocyanin Gallium polymethyl methacrylate (PMMA) at room temperature, firstly. Taking use of the modulation technique, we got the time advancement of 260 μs when the sample length was 2 mm long and the modulation frequency was 50 Hz, the corresponding group velocity was -7.69m/s. The phenomenon of backward propagation was a direct result of negative group velocity. And the energy flow still traveled in the forward direction in the sample although the light propagated with a negative group velocity.
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Hao Wang, Chunguang Zhang, "Backward propagation of light pulse in phthalocyanin gallium PMMA at room temperature", Proc. SPIE 7846, Quantum and Nonlinear Optics, 784616 (4 November 2010); doi: 10.1117/12.870713; https://doi.org/10.1117/12.870713
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