Dave Kharas

Multi-layer integrated photonics from the ultraviolet to the infrared

We demonstrate a scalable multi-layer integrated photonics platform that operates over a multi-octave wavelength range, from the near-ultraviolet (NUV) to the near-infrared (NIR). The platform is CMOS compatible and consists of silicon nitride (Si3N4) and alumina (Al2O3) optical waveguides cladded with silicon dioxide (SiO2). We demonstrate low-loss waveguides and passive components including diffractive vertical grating couplers for input/output (I/O). The multilayer nature of the platform enables complex routing of multiple wavelengths, making it useful for a variety of applications including integrated atomic-molecular-optical (AMO) and biophotonic systems.

Multi-level photonics for trapped-ion quantum computing

A scalable trapped-ion-based quantum-computing architecture requires the capability to optically address individual ions at several wavelengths. We demonstrate a dual-layered silicon nitride photonic platform for integration into planar ion traps designed for trapped-ion control in a 400 to 1100 nm wavelength range.

Electronic-photonic integration for government applications

We provide an overview of electronic-photonic integration techniques and describe our recent work to develop monolithic and hybrid photonic components and integrated circuits (PICS) realized in several material platforms (silicon, silicon nitride, compound semiconductors) for a variety of government applications.