PhD Defense: "Integrated SI3N4 Waveguide Circuits for Single- and Multi-Layer Applications"

Taran Huffman

October 19th (Thursday), 1:00pm
Elings Hall, Room 1605

Photonic integrated circuits are key building blocks for ever increasing range of applications including optical communications, sensing, and position and navigation. A key challenge to today’s photonics integration is realizing circuits and function that require low loss waveguides on chip while balancing the waveguide loss with device function and footprint. The Si­3N4 waveguide low loss platform serves as the third platform that complements silicon photonics and III/V semiconductor based photonics. Incorporating the low loss of Si3N4 waveguides into a photonic circuit to realize varying functions requires tuning the properties of the waveguide through parameters like waveguide core geometry and upper cladding design. The design, fabrication, and optimization of low loss Si3N4 waveguides for multiple applications is described and several devices are demonstrated. First a high-extinction tunable third-order resonator filter with record extinction ratio is presented utilizing a waveguide geometry for compact and higher FSR devices. Next, rotational sensors using low loss, large area designs are demonstrated in the form of both a waveguide gyroscope coil and high Q resonator. Lastly, a method for vertically integrating multiple waveguide layers, capable of integrating devices with different loss and footprint requirements, is demonstrated in the form of a multi-layer delay spiral.

About Taran Huffman:

photo of Taran Huffman Taran A. Huffman received the B.S. degree in physics of the University of Southern California in 2010, and his Masters degree in electrical engineering from the University of Calinfornia, Santa Barbara is 2012, where he currently nears the end of his pursuit of a Ph.D. His work centers around Si3N4 low loss waveguides for applications in sensing and filtering.

Hosted by: Daniel Blumenthal