Extremely broadband, on-chip optical nonreciprocity enabled by mimicking nonlinear anti-adiabatic quantum jumps near exceptional points

Youngsun Choi, Choloong Hahn, Jae Woong Yoon (), Seok Ho Song () and Pierre Berini
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Youngsun Choi: Hanyang University
Choloong Hahn: Hanyang University
Jae Woong Yoon: Hanyang University
Seok Ho Song: Hanyang University
Pierre Berini: School of Electrical Engineering and Computer Science, University of Ottawa

Nature Communications, 2017, vol. 8, issue 1, 1-9

Abstract: Abstract Time-asymmetric state-evolution properties while encircling an exceptional point are presently of great interest in search of new principles for controlling atomic and optical systems. Here, we show that encircling-an-exceptional-point interactions that are essentially reciprocal in the linear interaction regime make a plausible nonlinear integrated optical device architecture highly nonreciprocal over an extremely broad spectrum. In the proposed strategy, we describe an experimentally realizable coupled-waveguide structure that supports an encircling-an-exceptional-point parametric evolution under the influence of a gain saturation nonlinearity. Using an intuitive time-dependent Hamiltonian and rigorous numerical computations, we demonstrate strictly nonreciprocal optical transmission with a forward-to-backward transmission ratio exceeding 10 dB and high forward transmission efficiency (∼100%) persisting over an extremely broad bandwidth approaching 100 THz. This predicted performance strongly encourages experimental realization of the proposed concept to establish a practical on-chip optical nonreciprocal element for ultra-short laser pulses and broadband high-density optical signal processing.

Date: 2017
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DOI: 10.1038/ncomms14154

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