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16 September 2016Inverse-designed all-dielectric optical diode
The objective-first inverse-design algorithm is used to design an ultra-compact all-dielectric optical diode. Based on
silicon and air only, this optical diode relies on asymmetric spatial mode conversion between the left and right ports. The
first even mode incident from the left port is transmitted to the right port after being converted into an odd mode. On the
other hand, same mode incident from the right port is reflected back by the optical diode dielectric structure. The
convergence and performance of the algorithm are studied, along with a transform method that converts continuous
permittivity medium into a binary material design. The optimal device is studied with full electromagnetic simulations to
compare its behavior under right and left incidences, in 2D and 3D settings as well. A broadband optical diode is
reported with a large ratio between the two transmission directions. This illustrates the potential of the objective-first
inverse-design method to design ultra-compact broadband photonic devices.
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F. Callewaert, K. Aydin, "Inverse-designed all-dielectric optical diode," Proc. SPIE 9918, Metamaterials, Metadevices, and Metasystems 2016, 99182P (16 September 2016); https://doi.org/10.1117/12.2237318