Ryoichi Ishihara

Associate Professor, Group leader

Qutech, Dep. Quantum and Computer Engineering, Faculty of Electrical Engineering, Mathematics and Computer Science, Delft University of Technology

Ishihara-lab focuses on the integration technologies for unconventional electronic systems; quantum computers, quantum sensors, neuromorphic computers, and biodegradable sensors. Our work involves new materials, scalable fabrication of electronic and photonic devices, and 3D heterogeneous integration, aiming to realize unconventional electronic systems.

Photonic MEMS switches

Integrating many qubits in a diamond platform requires an efficient optical interface. This requires a low-loss optical waveguide interconnect, efficient fiber-to-waveguide coupling and optical switching and attenuation.

There are many architectures, mechanisms and platforms for optical switching and attenuation in waveguides. In this project we will use a silicon nitride platform in combination with micro-electromechanical systems (MEMS) switches.

Project 1: Actuation schemes

Within the class of optical MEMS switches, there are multiple actuation schemes. In this project you will do the following:
– Design and fabricate MEMS switches in the cleanroom for different actuation schemes.
– Measure the devices and characterize their performance at cryogenic temperatures.

Project 2: Hybrid integration

Typically, the architectures and actuation schemes are constrained by the layer. Hybrid integration is the method of fabricating devices on one substrate and subsequently transferring it to another. This unlocks the possibility of using different fabrication methods and architectures. In this project you will do the following:
– Design and fabricate MEMS switches in the cleanroom using hybrid integration techniques.
– Transfer the devices onto a photonic chip
– Measure the devices and characterize their performance at cryogenic temperatures.

Interested? Please contact r.ishihara@tudelft.nl or Maurice van der Maas <M.C.vanderMaas@tudelft.nl>