Doctoral Thesis: Inverse Design of Random Emitters in Nanophotonics

Monday, August 8
10:30 am - 12:00 pm

2-449

Wenjie Yao

Abstract:

Incoherent light from random emitters, such as thermal radiation, are very common in nature. However, modeling such random emitters may be challenging, as it naively requires Maxwell’s equations to be solved for all emitters to obtain the total response, which becomes computationally intractable in conjunction with large-scale optimization (inverse design). In this work, we present a trace formulation of random emitters that can be efficiently combined with inverse design, even for topology optimization over thousands of design degrees of freedom. Our formulation includes trivial cases with single emitter location (local density of states) and previous reciprocity-based approaches, limited to a few output channels (e.g. normal emission), as special cases, but generalizes to a continuum of emission directions by exploiting the low-rank structure of emission problems. We illustrate our method with three distinct cases: approaching the limit of local density of states, topology optimization for incoherent emission, and topology optimization for spatially averaged Raman scattering.

Details

  • Date: Monday, August 8
  • Time: 10:30 am - 12:00 pm
  • Category:
  • Location: 2-449
Additional Location Details:

Thesis Supervisor: Prof. Steven Johnson

Zoom link: https://mit.zoom.us/j/98409106509‚Äč