Initial example with manually specified constant T-matrix

examples/rectangular_constant_tmatrix/README.md

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+An example with arectangular array of a very simplistic
+model of scatterer with completely fabricated constant 
+T-matrix and manually specified set of VSWFs the scatterer
+interacts with (i.e. instead of constant lMax cutoff).
+
+This might be useful e.g. in symmetry-breaking thought
+experiments.

examples/rectangular_constant_tmatrix/modes/00_params.sh

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+#!/bin/bash
+
+# Common parameters for a rectangular array
+# N.B. We put those into bc, which does not understant exponential notation
+
+export PX_nm=375
+export PY_nm=375
+export BG_REFINDEX=1.52
+
+export BSPEC='[6,14]' # l = 1, m = +- 1 (i.e. xy) electric dipoles, nothing more
+
+# Input parameters for T-matrix. It shall have the following form:
+# '[[ T_mm, T_mp],
+#   [ T_mp, T_pp]]'
+#
+# The following lines are used to specify parameters for the most
+# simplistic T-matrix that b having only diagonal elements, but
+
+T_PHASE_MM=0.1
+T_PHASE_PP=0.05
+# "gain" factors; values larger than 1 are unphysical, 1 conserves energy
+T_GAINFACTOR_MM=1
+T_GAINFACTOR_PP=1
+
+# Setup bc
+echo 'scale=20;pi=3.14159265358979323846;' > bc_env
+export BC_ENV_ARGS="bc_env"
+
+
+# We have only one particle per unit cell here
+export P1X_nm=0
+export P1Y_nm=0
+
+
+# Lattice vectors (for the general scripts)
+export A1X_nm=${PX_nm}
+export A1Y_nm=0
+export A2X_nm=0
+export A2Y_nm=${PY_nm}
+
+# Reciprocal lattice vectors
+export B1X_nmi=$(bc <<< '1/'${PX_nm})
+export B1Y_nmi=0
+export B2X_nmi=0
+export B2Y_nmi=$(bc <<< '1/'${PY_nm})
+
+# Constant T-matrix
+T_MM="$(bc -l <<< -.5+.5*${T_GAINFACTOR_MM}*c\(${T_PHASE_MM}\))+$(bc -l <<< .5*${T_GAINFACTOR_MM}*s\(${T_PHASE_MM}\))j"
+T_PP="$(bc -l <<< -.5+.5*${T_GAINFACTOR_PP}*c\(${T_PHASE_PP}\))+$(bc -l <<< .5*${T_GAINFACTOR_PP}*s\(${T_PHASE_PP}\))j"
+export TMATRIX="\
+[[${T_MM},0],\
+[0,${T_PP}]]" # note no unescaped whitespaces allowed here
+

examples/rectangular_constant_tmatrix/modes/01a_realfreq_svd.sh

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+#!/bin/bash
+SCRIPTDIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" >/dev/null 2>&1 && pwd )"
+MISCDIR=../../../misc
+
+source ${SCRIPTDIR}/00_params.sh
+
+# try several lMaxes
+
+${MISCDIR}/lat2d_realfreqsvd.py \
+       	-B $BG_REFINDEX \
+	-b s${A1X_nm}e-9 s${A1Y_nm}e-9 \
+	-b s${A2X_nm}e-9 s${A2Y_nm}e-9 \
+	-p s${P1X_nm}e-9 s${P1Y_nm}e-9 \
+	-w ${BSPEC} -T ${TMATRIX} \
+	-k 0 0 \
+	-F 2.001 0.001 2.250  \
+	-P