Abstract
We propose a scheme of unidirectional transmission in a 1D nonlinear topological photonic crystal based on the topological edge state and three order optical nonlinearity. The 1D photonic crystals consists of a nonlinear photonic crystal L and a linear photonic crystal R. In the backward direction, light is totally reflected for the photons transmission prohibited by the bandgap. While in the forward direction, light interacts with the nonlinear photonic crystal L by optical Kerr effect, bringing a topological phase reversal and results the topological edge mode arising at the interface which could transmit photons through the bandgaps both of the photonic crystal L and R. When the signal power intensity larger than a moderate low threshold value of 10.0 MW/cm2, the transmission contrast ratio could remain at 30 steadily.
Highlights
It has potential applications similar with the electrical diode
Unidirectional transmission in 1D nonlinear photonic crystal based on topological phase reversal by optical nonlinearity
Little material has magnetic response in optical frequency range and spatiotemporal modulation always needs external electrical modulation, the processing speed would be impeded by the external electrical networks
Summary
It has potential applications similar with the electrical diode. The main approach of nonreciprocal transmission is using the magneto-optic effect,[1,2,3] optical nonlinearity[4,5,6,7,8,9] and spatiotemporal modulation.[10,11,12,13,14,15] Little material has magnetic response in optical frequency range and spatiotemporal modulation always needs external electrical modulation, the processing speed would be impeded by the external electrical networks. Unidirectional transmission in 1D nonlinear photonic crystal based on topological phase reversal by optical nonlinearity We propose a way to realize unidirectional transmission in 1D nonlinear photonic crystal heterostructures based on topological phase reversal.
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