Superscattering of light optimized by a genetic algorithm

Abstract

We analyse scattering of light from multi-layer plasmonic nanowires and employ a genetic algorithm for optimizing the scattering cross section. We apply the mode-expansion method using experimental data for material parameters to demonstrate that our genetic algorithm allows designing realistic core-shell nanostructures with the superscattering effect achieved at any desired wavelength. This approach can be employed for optimizing both superscattering and cloaking at different wavelengths in the visible spectral range.

Nonpolarm-plane GaN/AlGaN heterostructures with intersubband transitions in the 5–10 THz band

“…Specially, the scattering of subwavelength structures can be enhanced to realize superscatterers, which can magnify the scattering cross section of a given object remarkably [8]. Due to their potential applications in detection, spectroscopy, and photovoltaics [10][11][12][13][14][15][16], various superscatterers with different shapes and types have been designed [17][18][19][20][21][22][23][24][25][26][27][28][29][30], and the concept of superscatterer has been extended to acoustics [31,32].…”

Design of Ultracompact Graphene-Based Superscatterers

“…Besides, the concept of "surface superscatterers" is also proposed, where the scattering cross section of a deep-subwavelength dielectric cylinder is enhanced by a monolayer graphene sheet which is only one atom thick [11], [12]. Moreover, the scattering cross sections of subwavelength superscatterers can be further enhanced by overlapping the resonances from different scattering terms [13], [14], [15], [16], [17], [18], [19], [20]. Since compact superscatterers are more promising in the miniaturization and integration of plasmonic devices, it is quite necessary to design superscatterers by overlapping different resonance peaks in the deepsubwavelength scale.…”

“…However, this kind of resonances are caused by the resonance of a single scattering term, while the contributions from different scattering terms can be overlapped to further enhance the scattering cross sections [13], [14]. Due to the complexity of scattering models, the genetic algorithm has been used to optimize the superscattering of light where different resonance peaks are overlapped [20]. However, it still lacks an intuitive method to design the superscatterers.…”

Manipulating scattering features by metamaterials

“…In the following sections, we will discuss various scattering manipulation schemes, including the invisibility cloak [38], radar illusion [39], carpet cloak [40,41], DC cloak [17], mantle cloak [42], an ultra-thin carpet cloak [43], digital and programmable metasurface [44], and multilayer structure based on optimizations [45][46][47]. Finally, we give the conclusion on this topic.…”