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(a) Scanning electron microscopic image of asymmetric plasmonic Bragg structure used. (b) Schematic diagram for an actively feedback MI to control the time delay and relative phase delay between two femtosecond pulses. WP is a quarter wave plate for He:Ne laser beam, PD is a photodiode, BS is a 50:50 beam splitter, P is a polarizer, DL is a delay line , PT is a piezoelectric transduce , and NSOM is the near-field scanning optical microscope. The He:Ne laser line is depicted as red dashed line and the femtosecond pulse line is depicted as red solid line.
Near-field images of different time delay between illuminating two pulses. (a) Uncontrolled, (b) , and (c) .
Y-integrated intensities of Fig. 2: (a) black (b) gray, and (c) pale gray. The ratio is 1:1(uncontrolled), , .
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