Abstract
Billions of U.S. dollars of basic and applied research funding have been invested during the last few years in ideas proposing inverse concepts. The photonics market could not make an exception to this global trend, and thus, several agenda-setting research groups have already started providing sophisticated tools, constrained optimization algorithms, and selective evolution techniques towards this direction. Here, we present an approach of inverse design based on the exhaustive trial-and-testing of the available media and changing the physical dimensions’ range according to the operational wavelength. The proposed technique is applied to the case of an optimal radiation-enhancing cylindrical particle fed by a line source of visible light and gives a two-order increase in the magnitude of the produced signal.
Highlights
Billions of U.S dollars of basic and applied research funding have been invested during the last few years in ideas proposing inverse concepts
The implementation of improved gradient-based shape optimization methods can lead to fabrication-tolerant ultra-highly-efficient grating couplers [4], while the adjoint method in which the gradient of the objective function with respect to all parameters is evaluated via only a couple of full-field simulations can lead to novel compact nonlinear photonic devices with record-high performance [5]
We elaborate an approach leading to optimized operation of simple photonic devices through an exhaustive search of the parametric space, which contributes to the aforementioned inverse design paradigm shift
Summary
“Nobody pays for the forward solution of a problem unless it is an open one—if you want your research to get funded, propose an inverse concept.” Variants of such a statement are more and more frequently repeated behind closed doors during meetings of agenda-setting research groups, and in proposal review panels. It should be noted that all the reported maxima are non-boundary extrema solely belonging to the considered parametric ranges; they indicate resonances being “entrapped” in the parametric boxes defined by the corresponding value ranges In this way, for each combination of materials, we know the sizes and the frequency at which the most efficient operation is achieved. The frequency response of the particles across the entire visible spectrum is evaluated for both polarizations, and interesting conclusions regarding the selectivity of the designs are drawn With help from this simplistic particular example, we demonstrate how a useful toolbox can be provided to the involved experimental scientist determining multiple alternative designs that serve the prescribed purposes
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