Abstract

A new type of compact three-port circulator with flat-top transmission band (FTTB) in a two-dimensional photonic crystal has been proposed, through coupling the cascaded magneto-optical resonance cavities to waveguides. The coupled-mode theory is applied to investigate the coupled structure and analyze the condition to achieve FTTB. According to the theoretical analysis, the structure is further optimized to ensure that the condition for achieving FTTB can be satisfied for both cavity–cavity coupling and cavity–waveguide coupling. Through the finite-element method, it is demonstrated that the design can realize a high quality, nonreciprocal circulating propagation of waves with an insertion loss of 0.023 dB and an isolation of 23.3 dB, covering a wide range of operation frequency. Such a wideband circulator has potential applications in large-scale integrated photonic circuits for guiding or isolating harmful optical reflections from load elements.

© 2015 Optical Society of America

Multiport photonic crystal circulators created by cascading magneto-optical cavities

Qiong Wang, Zhengbiao Ouyang, and Qiang Liu
J. Opt. Soc. Am. B 28(4) 703-708 (2011)

Nonreciprocal optical divider based on two-dimensional photonic crystal and magneto-optical cavity

Victor Dmitriev and Marcelo N. Kawakatsu
Appl. Opt. 51(24) 5917-5920 (2012)

Three-port graphene-based electromagnetic circulator in the terahertz and infrared frequency ranges with a very low loss and wideband response

Vahid Nikkhah, Ahmad Bakhtafrouz, Mohsen Maddahali, and Somaye Kaviani Dezaki
J. Opt. Soc. Am. B 35(8) 1754-1763 (2018)

Versatile broadband polarization-independent optical circulators for nanophotonic integrated circuits

Curtis J. Firby, PoHan Chang, Amr S. Helmy, and Abdulhakem Y. Elezzabi
J. Opt. Soc. Am. B 35(7) 1504-1513 (2018)

Multifunctional magneto-metasurface for terahertz one-way transmission and magnetic field sensing

Sai Chen, Fei Fan, Xiaotong He, Meng Chen, and Shengjiang Chang
Appl. Opt. 54(31) 9177-9182 (2015)