Bulletin of the American Physical Society
Mid-Atlantic Section 2022 Meeting
Volume 67, Number 20
Friday–Sunday, December 2–4, 2022; University Park, PA, Pennsylvania State University
Session G04: AMO, and Laser Physics
9:00 AM–10:59 AM,
Sunday, December 4, 2022
Pennsylvania State University
Room: Osmond 106
Chair: Abhinava Chatterjee, Pennsylvania State Univeristy
Abstract: G04.00004 : Inverse Design of a Polarization Demultiplexer Photonic Circuit
9:59 AM–10:11 AM
Presenter:
William G Eshbaugh
(West Virginia University)
Author:
William G Eshbaugh
(West Virginia University)
Such sources are essential for optical quantum computation and require high indistinguishability,
purity, and brightness. To meet these requirements, the source must efficiently funnel the emitted
photons into appropriate collection channels (e.g., free space optics or on-chip waveguides). We
present an inverse design approach to develop a polarization demultiplexer, a nanophotonic device
that converts the QD’s polarization-entangled photons into a path-entangled pair coupled into or-
thogonal waveguides. Our approach utilizes a multi-objective optimization which simultaneously
maximizes two important figures of merit for on-chip photon sources: the coupling efficiency into
the desired waveguides, and the Purcell factor that increases the radiative rate. Using open-source,
adjoint method inverse design software, and modelling the QD as a linear electric dipole, the final
design results in a Purcell factor of ≈ 14 and a coupling efficiency of ≈ 95%. Our results demon-
strate the benefits that a multi-objective inverse design approach has over the previously established
nanophotonic design methods.
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