A Courant-Fischer-Weyl min-max principle combined with convex relaxations yields computable upper bounds on each individual singular value of the electromagnetic Green operator for arbitrary linear scatterers.
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Indexed singular value bounds on scattering operators: How many channels can a photonic device support?
A Courant-Fischer-Weyl min-max principle combined with convex relaxations yields computable upper bounds on each individual singular value of the electromagnetic Green operator for arbitrary linear scatterers.