Moiré superlattices are formed when two van der Waals layers are stacked vertically with a controlled twist angle. Transition metal dichalcogenides (TMDs) are semiconductor building blocks with highly tunable optical properties. After reviewing some early studies, I will discuss the limitations of TMD-based moiré superlattices and propose twisted hBN substrates as a new approach to expand the strategy of moiré engineering to a broader range of photonic materials. I will show how the ferroelectric domains of the twisted hBN substrate can be used to modulate the optical properties of TMD monolayers. Co-sponsored by: Advanced Science Research Center - the Graduate Center - City University of New York Speaker(s): XIAOQIN ELAINE LI Room: Auditorium, Bldg: ASRC , 85 St. Nicholas Terrace, New York, New York, United States, 10031, Virtual: https://events.vtools.ieee.org/m/416085