Gigahertz photothermal effect in silicon waveguides

Pernice, W. H. P.; Li, Mo; Tang, H. X.
November 2008
Applied Physics Letters;11/24/2008, Vol. 93 Issue 21, p213106
Academic Journal
We present a theoretical and experimental study of the frequency response of the photothermal effect in silicon waveguides. The effect is studied for modulation frequencies up to 3 GHz using integrated photonic circuits in Mach–Zehnder and ring oscillator configurations. The thermal behavior of silicon waveguides is described by a diffusive substrate heating model. In the low-frequency regime, the frequency response follows a -log(f) dependence, while a f-1/2 dependence is found in the high-frequency regime. Close agreement between theory and experiment allows for the accurate extraction of the photothermal absorption coefficient.


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