3-D Topology Optimization of Spatially Averaged Surface-Enhanced Raman Devices
Name
hammond-ihammond-sm-eecs-2024-thesis.pdf
Description
Thesis PDF
Size
42.01 MB
Format
Adobe PDF
Checksum (MD5)
3efd9b42efaf14b7c45625ef7843d55a
Author(s)
Hammond, Ian M.
Advisor(s)
Johnson, Steven G.
Date Issued
May 2024
Publisher
Massachusetts Institute of Technology
Abstract
Numerous nanophotonics applications necessitate designs that enhance distributed incoherent emission. Representative applications include light-emitting diodes, thermal emitters, and Raman sensing. Previous efforts in full-scale topology optimization for Surface Enhanced Raman Sensing (SERS) have predominantly focused on single particle emissions or two-dimensional systems, which are impractical for actual fabrication. An objective function represented by ട|E|⁴dV effectively approximates Raman enhancement. This function tends to diverge near sharp tips and other singular geometries in three-dimensional spaces for relevent materials. This thesis delves into methodologies for regularizing the optimization process to preclude the formation of such problematic geometries. Additionally, it integrates lithography constraints to ensure that the optimized SERS substrates are viable for fabrication. To align with computational limits, various strategies are employed to make the system manageable. The techniques developed in this study facilitate the practical design of 3-D systems that enhance incoherent emission through topology optimization.
MIT Department
Massachusetts Institute of Technology. Department of Electrical Engineering and Computer Science
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