What is it about?
High-index nanostructures support multiple electromagnetic modes whose response can be studied using Mie theory. Under certain circumstances, the response of several coexisting modes can destructively interfere in the far field, reducing the scattering of the nanostructure and resulting in the so-called anapole states. Here we claim to observe two of these anapoles - the second-electric anapole and the first magnetic anapole - in a configuration that can be easily built using standard fabrication tools: a silicon disk def by an optical waveguide.
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Why is it important?
This finding shows two relevant things: on one side, a single configuration (disk plus waveguide) to observe anapole states; on the other side, the potential of anapoles started in silicon photonic technology.
Perspectives
Our finding could open new avenues in building silicon photonic devices and structures requiring ultra-compact foot-prints since the dimensions of the disks are smaller than the illumination wavelength.
Alejandro Martinez
Universitat Politecnica de Valencia
Read the Original
This page is a summary of: Experimental observation of higher-order anapoles in individual silicon disks under in-plane illumination, Applied Physics Letters, November 2022, American Institute of Physics,
DOI: 10.1063/5.0108438.
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