"Tailoring Light-matter Interaction at the Nano-scale for Mid-infrared Optoelectronics"

Yu Yao, postdoctoral fellow in the School of Engineering and Applied Science at Harvard University

February 20th (Thursday), 2:00pm
Engineering Science Building (ESB), Room 2001

The mid-infrared wavelength range (3-15 μm) is of particular importance for applications in spectroscopy, biomedical sensing, communication, safety and industry, since it hosts strong vibrational fingerprints of many molecules and broad atmospheric transmission windows. Yet, the development of high-performance compact optoelectronic devices for mid-infrared spectral region remains a great challenge, mainly due to the material limitations. The rapid development in nanostructures and nanomaterials has brought great opportunities to control light-matter interaction at the subwavelength scale and generate exotic properties which do not exist in nature. Translating these technologies to novel optic and optoelectronic devices, esp. in the mid-infrared region, holds great promise to solve the big challenges posted by the fundamental constraints in natural materials.
In this talk, I will present novel device designs based on nanostructures and graphene for high performance, ultra-compact mid-infrared optoelectronic devices. I will show that the band engineering of semiconductor hetero-structures enables great flexibility in tailoring the laser emission spectra over the whole mid-infrared spectral range. I will also illustrate how to engineer the light-matter interaction at the nano-scale with optical antennas to develop mid-infrared photo-detectors and optical modulators, which will enable efficient, on-chip systems for various applications.

About Yu Yao:

photo of yu yao Dr. Yu Yao is a postdoctoral fellow in the School of Engineering and Applied Science at Harvard University. She received the Ph.D. degree in Electrical Engineering from Princeton University in 2011, where she worked on developing novel mid-infrared semiconductor laser sources. Her current research focuses on semiconductor heterostructures and quantum devices, nanophotonics, graphene and other 2D materials and their applications in optoelectronic devices.

Hosted by: Professor Larry Coldren