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A photonic crystal (PC)-based symmetric Mach-Zehnder type all-optical switch (PC-SMZ), previously operated by single pump pulse alone, has been operated newly by a multiple-pump pulse train corresponding to a repetition frequency of 40 GHz at pulse energy as low as 10 fJ. The device involves quantum dots (QDs) in two parallel PC arms as optical nonlinear media and functions as a time-differential...
A sixfold acceleration of the phase shift recovery time in photonic crystal/quantum dot waveguides having a Purcell enhanced spontaneous emission peak resonant to the excited state of the quantum dots is experimentally demonstrated.
The phase shift of signal pulse due to carrier excitation in quantum dots (QDs) induced by repetition control pulses is measured by two-color pump/probe measurements to investigate the effects of repetition frequency on the switch operation.The result suggests the possibility of beyond 40 GHz repetitive switch operations in photonic-crystal-based Mach-Zehnder (PC-SMZ) by using QDs with faster decay...
Topology optimization method has been applied to design the waveguide bends in the air-bridge type two-dimensional photonic crystal slab. We demonstrated that the optimized bends show good performance, comparable to the straight waveguide.
A metal-mask (MM) method for selective-area-growth (SAG) of self-assembled InAs quantum dots (QDs) on a GaAs substrate was developed for applications of ultra-small and ultra-fast all optical devices based on a combination of QD and photonic crystal waveguides (PC-WGs). Successful SAG of QDs with high density and high optical quality comparable to conventional InAs-QDs grown without the MM was confirmed...
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