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Asymmetric Si-slot Coupler with Nonreciprocal Response Based on Graphene Saturable Absorption
- Source :
- IEEE Journal of Quantum Electronics, vol. 57, no. 3, pp. 1-10, art. no. 8400210, June 2021
- Publication Year :
- 2021
-
Abstract
- We present the study of a proof-of-concept integrated device that can be used as a nonlinear broadband isolator. The device is based on the asymmetric loading of a highly-confining silicon-slot photonic coupler with graphene layers, whose ultrafast and low-threshold saturable absorption can be exploited for nonreciprocal transmission between the cross-ports of the coupler. The structure is essentially a non-Hermitian system, whose exceptional points are briefly discussed. The nonlinear device is modeled with a coupled Schrodinger equation system whose validity is checked by full-vector finite element-based beam-propagation method simulations in CW. The numerically computed performance reveals a nonreciprocal intensity range (NRIR) in the vicinity of 100 mW peak power with a bandwidth spanning tens of nanometers, from CW down to ps-long pulses. Finally, the combination of saturable absorption and self-phase modulation (Kerr effect) in graphene is studied, indicating the existence of two NRIR with opposite directionality.<br />Comment: 10 pages, 10 figures. Published online at 5 April 2021 in the IEEE Journal of Quantum Electronics
- Subjects :
- Physics - Optics
Physics - Applied Physics
Subjects
Details
- Database :
- arXiv
- Journal :
- IEEE Journal of Quantum Electronics, vol. 57, no. 3, pp. 1-10, art. no. 8400210, June 2021
- Publication Type :
- Report
- Accession number :
- edsarx.2101.10210
- Document Type :
- Working Paper
- Full Text :
- https://doi.org/10.1109/JQE.2021.3071247