Inverse design of plasmonic nanotweezers

Kenneth B. Crozier

doi:10.1117/12.3030000

3 October 2024 Inverse design of plasmonic nanotweezers

Kenneth B. Crozier

Proceedings Volume PC13112, Optical Trapping and Optical Micromanipulation XXI; PC131120A (2024) https://doi.org/10.1117/12.3030000
Event: Nanoscience + Engineering, 2024, San Diego, California, United States

Abstract

Plasmonic apertures concentrate optical fields, enhancing the gradient force for precise trapping of nanoscale entities. Traditionally, design relied on intuition and simulations. We instead present a novel approach using topology optimization and adjoint sensitivity analysis. Our computational algorithm inversely designs plasmonic nanoapertures. Surprisingly, the algorithm produces an aperture reminiscent of the double nanohole, a structure that has been adopted by many groups. Our algorithm produces outer structures that surround the aperture and enhance the electric field intensity, increasing trapping potential by ~4.97 times. Compared to representative studies, our design achieves ~1.95 and ~27.9 times greater trapping potential than algorithm-designed and forward-designed nanotweezers, respectively. This work establishes topology optimization as an effective method for high-performance plasmonic nanotweezer design.

Conference Presentation

Citation Download Citation

Kenneth B. Crozier "Inverse design of plasmonic nanotweezers", Proc. SPIE PC13112, Optical Trapping and Optical Micromanipulation XXI, PC131120A (3 October 2024); https://doi.org/10.1117/12.3030000

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