University of Massachusetts Amherst

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Seminar: Marko Loncar

“Nanophotonics with ‘Difficult’ Materials”


Monday, November 13, 2017 - 4:00pm to 5:15pm


Marko Loncar, Professor, Harvard University


ELab II Auditorium


Diamond possesses remarkable physical and chemical properties, and in many ways is the ultimate engineering material. For example, it is transparent from the ultra-violet to infrared, has a high refractive index, strong optical nonlinearity (Kerr and Raman) and a wide variety of light-emitting defects. These properties make diamond a highly desirable material for many applications, including those in quantum and nonlinear photonics, high power optics and optomechanics. In my talk, I will review the advances in nanotechnology that have enabled fabrication of nanophotonic components and chip-scale systems in diamond, including quantum networks based on silicon-vacancy (SiV) color centers, and frequency combs and Raman lasers.

Lithium niobate (LN) is an “old” material with many applications in optical and microwave technologies, owing to its unique properties that include large second order nonlinear susceptibility, large piezoelectric response, wide optical transparency window and high refractive index. Conventional bulk LN components, including modulators and periodically polled frequency converters have been the workhorse of the optoelectronic industry. They are reaching their limits, however, as they rely on weakly guiding ion-diffusion defined optical waveguides in bulk LN crystal. I will discuss our efforts aimed at the development of integrated LN platform, featuring sub-wavelength scale light confinement and dense integration of optical and electrical components, which has the potential to revolutionize optical communication and microwave photonics.

Marko Loncar is Tiantsai Lin Professor of Electrical Engineering and John A Paulson School of Engineering and Applied Sciences (SEAS) at Harvard, and Harvard College Professor. Loncar received PhD in electrical engineering from Caltech in 2003, after which he did postdoc at Harvard (with Federico Capasso). He joined SEAS faculty in 2006. Loncar is expert in nanophotonics and nanofabrication, and his current research interests include quantum photonics, nonlinear photonics, high power optics and quantum optomechanics.