Infrared Optical Spectroscopy with Atomic Monolayers

Dr. Yaqing Bie (hosted by Li Yang), Department of Physics, Massachusetts Institute of Technology, Boston
February 26, 2018 at 4:00 pm
241 Compton
Event Description 

The discovery of two-dimensional crystals—monolayers with atomic thickness—continues to drive exciting developments in physics, chemistry, and nanotechnologies. At the core is the construction and detection of novel material structures based on existing or new monolayers. My study is to develop infrared optical spectroscopy for detecting intrinsic properties of the monolayers and their interaction with other nanostructures, such as molecules and photonic crystals. Two examples will be shown in this talk. The first is related to our recent work based on monolayer or few layers MoTe2 and black phosphorus, which have shown strong excitonic emission in the near infrared range and are compatible with silicon photonics.  We have developed the atomically thin light emitting diode devices/lasers that is coupled with silicon photonics. Second, I will show you how we can use monolayer graphene to understand microscopic physical and electrochemical processes at electrolyte/electrodes interfaces. Such processes are critical to electrocatalysis, batteries and bioelectrical phenomena, but are very challenging to understand using traditional means. By developing a new infrared vibrational spectroscopy, we were able to unveil the adsorption of methylene group at the interface and a reversible field-induced electrochemical deposition. I am looking forward to sharing these infrared optical studies, which could be promising for understanding novel quantum optical effects as well as developing new opto-electronic devices.

 

Coffee:  3:45 pm, 241 Compton