Optical Sensors with nano-Topological Materials

(Mentors: Ken Burch, Associate Prof. of Physics; Dunwei Wang, Associate Prof. of Chemistry)

Description: This project will focus on the growth of TaAs Weyl semimetals nanostructure for use in Mid-IR optical detectors. These unique compounds offer very fast optical response useful for biological, thermal and chemical sensing. In addition their unique topological properties suggest one can measure the polarization state as well as the intensity of light, which could be important for high speed communications. One student will work in the Wang group to grow these materials and characterize them using electrical transport and optical microscopy in the Burch group. Another student will work in the Burch group, focused on performing photoconductivity measurements and making devices.

(a) SEM image of the TaAs (purple) device, Au contacts (yellow) are numbered and the alignment is shown by the axis. (b) Photocurrent vs. chopper frequency, fit56,67 revealing a τth = 6.8 μs. Photovoltage sign change due to the Seebeck effect, aligned with the leads (c) longitudinal and (d) Hall.
(a) SEM image of the TaAs (purple) device, Au contacts (yellow) are numbered and the alignment is shown by the axis. (b) Photocurrent vs. chopper frequency, fit56,67 revealing a τth = 6.8 μs. Photovoltage sign change due to the Seebeck effect, aligned with the leads (c) longitudinal and (d) Hall.