  Two-dimensional transition metal dichalcogenides (TMDCs) integrated to
photonic structures provide an intriguing playground for the development of
novel optoelectronic devices with improved performance. Here, we show the
enhanced light emission from TMDC based van der Waals heterostructures through
coupling with microsphere cavities. We observe cavity-induced emission
enhancement of TMDC materials which varies by an order of magnitude, depending
on the size of the microsphere and thickness of the supporting oxide substrate.
Furthermore, we demonstrate microsphere cavity-enhanced electroluminescence of
van der Waals light emitting transistor, showing the potential of 2D material
based hybrid optoelectronic structures.
