Towards nanophotonic optical isolation via inverse design of energy transfer in non-reciprocal media

• URL: http://arxiv.org/abs/2310.13485v2
• Date: Wed, 1 May 2024 13:20:28 GMT
• Title: Towards nanophotonic optical isolation via inverse design of energy transfer in non-reciprocal media
• Authors: Claire M. Cisowski, Madeline C. Waller, Robert Bennett,
• Abstract summary: We use three-dimensional topology optimization via the level-set method to optimise one-way energy transfer for point-like source and observation points. We carry out an optimization based on a very general equation that we derive for energy transfer in a nonreciprocal medium. This work represents a stepping stone towards practical nanophotonic optical isolation, often regarded as the holy grail' of integrated photonics.
• Score: 0.0
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: In this work we generalise the adjoint method of inverse design to nonreciprocal media. As a test case, we use three-dimensional topology optimization via the level-set method to optimise one-way energy transfer for point-like source and observation points. To achieve this we introduce a suite of tools, chiefly what we term the `Faraday-adjoint' method which allows for efficient shape optimization in the presence of magneto-optical media. We carry out an optimization based on a very general equation that we derive for energy transfer in a nonreciprocal medium, and link finite-different time-domain numerics to analytics via a modified Born series generalised to a tensor permittivity. This work represents a stepping stone towards practical nanophotonic optical isolation, often regarded as the `holy grail' of integrated photonics.

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