7 March 2014 Dual slot modulator for millimeter wave photonics
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Abstract
Silicon slot waveguides leverage the field enhancement provided by the continuity of normal electric flux density across a dielectric boundary to confine an optical mode to a void between two proximal silicon strips. Silicon-organic hybrid slot modulators make use of this mode profile by infiltrating the slot region with a non-linear organic electro-optic material (OEOM) for modulation. The dual slot modulator takes this idea a step further by similarly confining a propagating RF mode to the same slot region to increase modal overlap for improved modulation efficiency. This effect is achieved by aligning a titanium dioxide RF slot along a conventional silicon slot waveguide. The TiO2 has an optical refractive index lower than silicon, but a significantly higher index in the RF regime. As a result of the large modal overlap and high electro-optic activity of the OEOM this design can produce measured phase modulated VπL of less than 1.40 V•cm. Furthermore, as the modulator operates without the introduction of a doping scheme it can potentially realize high operational bandwidth and low loss. We present work towards achieving various working prototypes of the proposed device and progress towards high frequency operation.
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Matthew R. Konkol, Matthew R. Konkol, Stephen T. Kozacik, Stephen T. Kozacik, David L. K. Eng, David L. K. Eng, Brock Overmiller, Brock Overmiller, Mathew J. Zablocki, Mathew J. Zablocki, Benjamin C. Olbricht, Benjamin C. Olbricht, Janusz Murakowski, Janusz Murakowski, Shouyuan Shi, Shouyuan Shi, Ahmed Sharkawy, Ahmed Sharkawy, Dennis W. Prather, Dennis W. Prather, } "Dual slot modulator for millimeter wave photonics", Proc. SPIE 8983, Organic Photonic Materials and Devices XVI, 898317 (7 March 2014); doi: 10.1117/12.2038208; https://doi.org/10.1117/12.2038208
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