Dual rf-optical slot waveguide for ultrabroadband modulation with a subvolt VÏ€

Shouyuan Shi; Prather, Dennis W.
May 2010
Applied Physics Letters;5/17/2010, Vol. 96 Issue 20, p201107
Academic Journal
In this letter, we propose a high speed and ultralow driving voltage traveling wave electro-optic (EO) modulator based on a dual horizontal slot waveguide. The proposed design harnesses the unique properties of ferroelectric materials such as LiNBO3 and exotic, organic EO polymers to tightly confine both the optical and rf modes in a nanoscale slot maximizing the nonlinear interaction with the electric field. Larger electrode separation allows for significant reduction in rf propagation loss. Simulations of the half-wavelength voltage-length product and electro-optic response of the proposed device reveal ultrabroadband operation, up to 250 GHz, and subvolt driving voltage for a 1 cm long modulator.


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