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Gigahertz photothermal effect in silicon waveguides
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View: Figures


Image of FIG. 1.
FIG. 1.

(a) The geometry of the model used to describe diffusive heating from a surface heater into a substrate. The height of the waveguide is thin in comparison to the thickness of the substrate; therefore, the heater is assumed to be infinitely thin. (b) The temperature distribution of a typical FEM simulation. The heater is of uniform temperature for frequencies below . (c) The thermal roll-off behavior of the waveguide simulated by FEM. The cutoff frequency is , determined by fitting the data with a first-order low pass.

Image of FIG. 2.
FIG. 2.

(a) The interference fringes from the MZI (b), showing good extinction ratio and a period of . (c) The transmission of a ring oscillator (d), showing an extinction ratio of .

Image of FIG. 3.
FIG. 3.

(a) The dynamic response of a device in Mach–Zehnder configuration. The experimental curve (red markers) follows a dependency in the frequency range below . From the slope of the linear fit (green line) the thermal absorption coefficient can be obtained as . (b) Shown is the high-frequency response of a ring oscillator. The dynamic response follows a dependence above , which corresponds to a decay of per frequency decade, indicated by the blue line.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Gigahertz photothermal effect in silicon waveguides