Jie Liu Ya, Yuan Dong Hui, Dong Zheng-Gao, Wang Jin
Opt Express. 2022 Jan 17;30(2):1219-1227. doi: 10.1364/OE.444393.
We demonstrate a rigorous multimode engineering method to achieve multifrequency superscattering with flexible controllability in a subwavelength graphene/hexagonal boron nitride (hBN) cylindrical system. Through delicately tuning the chemical potential of graphene, different resonance channels of the proposed stucture can be spectrally overlapped to construct the multiple superscattering points. Consequently, the scattering cross section is enhanced effectively and the so-called superscattering beyond the single-channel scattering limit can be attained. Numerical calculations on scattering spectra, near-field, and far-field distributions are performed to confirm the scattering enhancement. The general principles presented here may suggest an accurate and efficient approach to actively tune the light-matter interaction at the subwavelength scale.
我们展示了一种严格的多模工程方法，以在亚波长石墨烯/六方氮化硼（hBN）圆柱系统中实现具有灵活可控性的多频超散射。通过精细调节石墨烯的化学势，所提出结构的不同共振通道可以在光谱上重叠，以构建多个超散射点。因此，散射截面得到有效增强，并且可以实现超越单通道散射极限的所谓超散射。进行了散射光谱、近场和远场分布的数值计算，以证实散射增强。这里提出的一般原理可能暗示了一种在亚波长尺度上主动调节光与物质相互作用的准确而有效的方法。
