The topic of this issue is an optimization problemrn(SOLBOX-06), involving nanocubes at opticalrnfrequencies. This type of array arrangement (namely, arnnanoarray) is useful for controlling and directing opticalrnwaves in numerous applications, such as optical links,rnsensing, and energy harvesting [1-6]. A particular aim inrnSOLBOX-06 is to maximize the scattering or radiationrnof a given array structure in desired directions. Despiternthe number of unknowns being relatively small, the mainrnchallenge is the size of the optimization space, which isrngrows exponentially with the number of nanocubes. Inrnaddition, the nanocubes are made of silver (Ag). They mustrntherefore be modeled as penetrable objects with negativernreal permittivity, at optical frequencies. The sample solutionsrnalso included in this issue use genetic algorithms, combinedrnwith a solver based on surface integral equations, and thernMultilevel Fast Multipole algorithm. Alternative solutionsrnof the same problems with other solvers, possibly usingrndiff erent and more-effi cient optimization tools (heuristic orrngradient-based) and solution methods (e.g., volume integralrnequations, other types of acceleration algorithms, iterativernsolvers, and discretization techniques), are welcome. Pleasernsubmit your solutions to ozergul@metu.edu.tr.
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