Nonreciprocal propagation in a non-Hermitian silicon photonic coupler employing graphene saturable absorption

We present the concept, analysis and design of a nonreciprocal system of coupled nonlinear waveguides, operating at the near infrared. We exploit the spatial asymmetry induced by the exceptional points of a non-Hermitian coupler which, combined with saturable absorption in the nonlinear regime, can...

Full description

Saved in:
Bibliographic Details
Published inEPJ Web of conferences Vol. 238; p. 11006
Main Authors Chatzidimitriou, Dimitrios, Pitilakis, Alexandros, Yioultsis, Traianos, Kriezis, Emmanouil
Format Journal Article Conference Proceeding
LanguageEnglish
Published Les Ulis EDP Sciences 2020
Subjects
Absorption
Asymmetry
Broadband
Couplers
Graphene
Reciprocity
Silicon
Waveguides
Online AccessGet full text
ISSN2100-014X
2101-6275
2100-014X
DOI10.1051/epjconf/202023811006

Cover

More Information
Summary:We present the concept, analysis and design of a nonreciprocal system of coupled nonlinear waveguides, operating at the near infrared. We exploit the spatial asymmetry induced by the exceptional points of a non-Hermitian coupler which, combined with saturable absorption in the nonlinear regime, can break Lorentz reciprocity. In this work, we introduce asymmetric losses in a pair of coupled silicon waveguides by overlaying only one of them with unbiased graphene, subject to saturable absorption. The device can be used as a broadband half-duplex isolator: a two-port component offering unidirectional transmission of high-power signals.
Bibliography:ObjectType-Conference Proceeding-1
SourceType-Conference Papers & Proceedings-1
content type line 21
ISSN:2100-014X
2101-6275
2100-014X
DOI:10.1051/epjconf/202023811006