Abstract
We demonstrate optical bistability in a Silicon-On-Insulator two-bus ring resonator with input powers as low as 0.3mW. We evaluate the importance of the different nonlinear contributions and derive time constants for carrier and thermal relaxation effects. In some cases, we also observe pulsation due to interaction between the dominant nonlinear effects. Such a behaviour may be problematic for possible memory and switching operations. Alternatively, it could be used for (tunable) pulse generation.
Highlights
Photonic wire structures fabricated in high contrast systems such as Silicon-on-Insulator (SOI) allow strong transverse confinement of light within submicron dimensions
We demonstrate optical bistability in a Silicon-On-Insulator two-bus ring resonator with input powers as low as 0.3mW
We evaluate the importance of the different nonlinear contributions for ultrasmall two-bus ring resonators and derive time constants for carrier and thermal relaxation
Summary
Photonic wire structures fabricated in high contrast systems such as Silicon-on-Insulator (SOI) allow strong transverse confinement of light within submicron dimensions. Received 27 September 2005; revised 8 November 2005; accepted 8 November 2005 14 November 2005 / Vol 13, No 23 / OPTICS EXPRESS 9623 finement can even be further enhanced in the longitudinal direction by using resonant structures such as ring resonators and photonic crystal (PhC) nanocavities, in which the propagation of the light pulse is slowed down Such structures with high confinement are of great interest for nonlinear optics, as they allow nonlinear interaction with relatively low power levels. Through the TPA process, free carriers are excited which result in additional absorption (Free Carrier Absorption, FCA) and an associated index change (Free Carrier Dispersion, FCD) After a while, these carriers will recombine and in the case of submicron structures such as photonic wires, this is mainly due to surface recombination. Due to conduction and convection, the structure cools down to a steady-state temperature
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