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All-optical short pulse translation through cross-phase modulation in a VO2 thin film

VO2 is a promising material for reconfigurable photonic devices due to the ultrafast changes in electronic and optical properties associated with its dielectric-to-metal phase transition. Based on a fiber-optic, pump-probe setup at 1550 nm wavelength window, and by varying the pump-pulse duration, we show that the material phase transition is primarily caused by the pump-pulse energy. For the first time, we demonstrate that the instantaneous optical phase modulation of probe during pump leading edge can be utilized to create short optical pulses at probe wavelength, through optical frequency discrimination. This circumvents the impact of long recovery time well known for the phase transition of VO2VO2.

Optics Letters,  41, 2, 238, 2016

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Authors: 
Shima Fardad, Susobhan Das, Alessandro Salandrino, Eric Breckenfeld, Heungsoo Kim, Judy Wu*, and Rongqing Hui *KU Authors