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Ultrafast all-optical switching in AlGaAs photonic crystal waveguide interferometers
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View: Figures


Image of FIG. 1.
FIG. 1.

(a) Schematic of the MZI switch. The total length of the MZI excluding the PhC waveguides was , and the input and output waveguides had a width of . The W1 and W3 PhC waveguides had a length of , where is the lattice constant, giving and , respectively. The value of was reduced to (i.e., ) for the self-collimator. (b) Scanning electron micrograph (SEM) of the W3 PhC waveguides. The three zoomed SEMs show, respectively, (i) the W3 waveguide, (ii) the verticality of the PhC holes, and (iii) the sidewalls of the ridge waveguide.

Image of FIG. 2.
FIG. 2.

Experimental setup.

Image of FIG. 3.
FIG. 3.

Time dependence of the nonlinear transmission spectra for (a) the ridge waveguide reference sample and (b) the three different types of PhC design. The probe light wavelength was 920 nm for each sample. The signal at for the W3 and ridge waveguide interferometers is caused by a reflected pulse from a beam splitter. The rise time is most likely due to carrier cooling (Ref. 8). (c) Switching times of the three different types of PhC and the unpatterned ridge waveguide reference sample. The switching time is characterized by the time of the nonlinear transmission, as determined by an exponential fit to the data in (a) and (b). (d) Power dependence of the transmission change for the W1 and ridge waveguides.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Ultrafast all-optical switching in AlGaAs photonic crystal waveguide interferometers