Rapid nanophotonic structure design and optimization using a coupled dipole approach (Conference Presentation)

Euan McLeod; Weilin Liu

doi:10.1117/12.2290774

14 March 2018 Rapid nanophotonic structure design and optimization using a coupled dipole approach (Conference Presentation)

Euan McLeod, Weilin Liu

Author Affiliations +

Proceedings Volume 10541, Photonic and Phononic Properties of Engineered Nanostructures VIII; 105411J (2018) https://doi.org/10.1117/12.2290774
Event: SPIE OPTO, 2018, San Francisco, California, United States

Abstract

Currently, many nanophotonic structures are designed based on heuristic principles, for example the design of gratings based on wavevector matching, or the design of a nanoantenna to have a length equal to a half-wavelength. In contrast, automated iterative optimization-based approaches can yield complex nonintuitive structures that provide better performance than heuristically-designed structures. This is especially true for 3D photonic structures, whose behavior can be more dificult to conceptualize than that of 2D structures. The challenge is that multi-parameter optimization routines often require hundreds or thousands of iterations, but a typical full-wave nanophotonic simulation may take hours per iteration. One type of optimization approach that has been applied to nanophotonics is topology optimization (TO). While TO works well for top-down fabrication where structures are fabricated from continuous media, it is not as well-suited for bottom-up, or additive-type fabrication methods based on building blocks of non-negligible size. Here we present a design methodology based around iterative object placement optimization, where the iterative loops are rapidly computed using a coupled dipole approach. The coupled dipole approach cannot capture all of the same physics as full-wave simulation approaches, however it can provide approximate results much more rapidly. We compare the accuracy of the coupled dipole approach to finite-difference time domain simulations. Two application designs will also be presented: compact 3D waveguide couplers and superresolution imaging structures.

Conference Presentation

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Euan McLeod and Weilin Liu "Rapid nanophotonic structure design and optimization using a coupled dipole approach (Conference Presentation)", Proc. SPIE 10541, Photonic and Phononic Properties of Engineered Nanostructures VIII, 105411J (14 March 2018); https://doi.org/10.1117/12.2290774

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KEYWORDS

Nanophotonics

Additive manufacturing

Optical design

Structural design

3D image processing

Nanoantennas

Numerical analysis

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