Hirokazu Miyake

Research: Topological Nanophotonics

Managing worldwide demand for increased data consumption and faster data processing requires both fundamental and applied research on photonic systems to take full advantage of their potential for large bandwidth and fast speed as well as their potential role in quantum information processing for dramatic speed up of certain computational tasks. One direction of research in this area is to take advantage of micro and nanofabrication techniques developed by the electronics industry to process silicon to create novel chip-scale photonic structures for guiding and manipulating light.

SEM image of photonic crystals
Left figure is a scanning electron microscope (SEM) image of a nanoscale grating and topological photonic crystal waveguide fabricated with gallium arsenide. Right figure is a SEM image of a nanoscale photonic crystal cavity fabricated with gallium arsenide.

I have worked in the area of nanophotonics with Professor Mohammad Hafezi and Professor Edo Waks at the University of Maryland and the Joint Quantum Institute to create novel photonic systems. In particular, I have explored nanophotonic systems that have interesting topological properties which can be applied to chip-scale photon transport that is robust to fabrication imperfections. Towards this goal, we have proposed a new type of photonic crystal which possess topological edge states that propagate in only one direction. We are working to fabricate our proposed structure using the nanofabrication facilities at the University of Maryland and the National Institute of Standards and Technology.

Schematic and electric field intensity of a topological edge state
Left figure is a schematic of the honeycomb-lattice-like photonic crystal with triangular air holes in a dielectric substrate and right figure is the electric field intensity of the topological edge state. Note the edge state goes around sharp corners without decreasing in intensity, indicating that the edge state is topologically protected. The mode is excited around a wavelength of 940 nm.