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7 March 2014 High bandwidth, low loss suspended silica splitters
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Optical splitters are one of the fundamental and most necessary components in modern photonic devices. They are used for splitting, coupling and monitoring photonic systems. So far, most splitters were fabricated based on evanescent field coupling or Y-branch dividers for which high precision lithography alignment is needed. In this work, we have proposed a new type of splitter which works based on multimode bend loss and mode mismatch coupling. Since this device has a novel suspended multimode region, it could be functionalized to detect any type of molecule binding to the surface. We have developed a 3D FDTD model to simulate the device’s behavior. One of the most interesting features of this device is that they have a broadband response and the coupling ratio doesn’t change by wavelength and is constant. The main idea behind coupling mechanism in this splitter is the existence of a protrusion region in which the mode conversion occurs.
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Soheil Soltani and Andrea M. Armani "High bandwidth, low loss suspended silica splitters", Proc. SPIE 8980, Physics and Simulation of Optoelectronic Devices XXII, 898005 (7 March 2014);

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