Topologically protected optical signal processing using parity–time-symmetric oscillation quenching

Topologically protected bound states in photonic parity-time-symmetric crystals.

Parity-time (PT)-symmetric crystals are a class of non-Hermitian systems that allow, for example, the existence of modes with real propagation constants, for self-orthogonality of propagating modes, and for uni-directional invisibility at defects. Photonic PT-symmetric systems that also support topological states could be useful for shaping and routing light waves. However, it is currently deba...

Quantum simulation of topologically protected states using directionally unbiased linear-optical multiports

David S. Simon,1,2,* Casey A. Fitzpatrick,2,† Shuto Osawa,2,‡ and Alexander V. Sergienko2,3,§ 1Department of Physics and Astronomy, Stonehill College, 320 Washington Street, Easton, Massachusetts 02357, USA 2Department of Electrical and Computer Engineering & Photonics Center, Boston University, 8 Saint Mary’s Street, Boston, Massachusetts 02215, USA 3Department of Physics, Boston University, 5...

Topologically-Protected Low Dimensional Metals

Optical Signal Processing

he student engineer who wishes ultimately to pursue R&D is well-advised to have a thorough grounding in fundamental topics, e.g., linear and non-linear systems. Bradley Boone has published a textbook in optical signal processing that commendably leads the student from fundamental mathematical foundations to the fundamentals of physical optics, to relevant optical devices, all the way to specifi...

Topologically protected elastic waves in phononic metamaterials

Surface waves in topological states of quantum matter exhibit unique protection from backscattering induced by disorders, making them ideal carriers for both classical and quantum information. Topological matters for electrons and photons are largely limited by the range of bulk properties, and the associated performance trade-offs. In contrast, phononic metamaterials provide access to a much w...