Module layers 

S-matrices of planar multilayer stacks: one S-matrix of 2-by-2 blocks per transverse wavevector, built from interface() and add, with analytic pullbacks.

Upstream: treams.SMatrices.stack of interfaces and propagations.

Modules

saved 🔒

Fixed invocation-state layout of independent planar channels.

Structs

Channel 🔒

The stack of one transverse wavevector: the lowest interface, then one step per interior layer.

LayerStackGradient

Multilayer parameter cotangents under the real Hermitian pairing.

LayerStackResidual

What layer_stack saves for its pullback: the solves of every transverse wavevector, each on its own, without a dense matrix over all of them.

Step 🔒

One interior layer: propagation across it, then the interface above it.

Functions

layer_stack

Stack layers independently for each transverse wavevector; the output is one S-matrix of four 2-by-2 blocks per wavevector.

propagate 🔒

Place the propagation P = diag(phase) across a layer above the stack below.

propagate_pullback 🔒

Pull the cotangent g of propagate back to the stack below and the phases.