Recently, Wu Yihui's research group of the State Key Laboratory of Applied Optics and Optics at the Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences has proposed a new type of omni-directional polarization independent absorption structure to solve the influence of nano-absorbing structures on the incident angle. Related research results were published in Optics Express (DOI:10.1364/OE.23.00A413).

Due to the potential application of ultra-absorbing nanostructures in the fields of photodetectors and photovoltaic cells, great attention has been paid. At present, the nano-absorption structures are mainly concentrated in the metamaterial structure, but the metamaterials realize perfect impedance matching and pose severe challenges to current nano-fabrication techniques.

In order to overcome the shortcomings of the absorption structure's sensitivity to structural parameters, a new type of nanostructure based on the guided resonance principle has been proposed in the previous research work. Although an absorption rate of 99.16% can be achieved, the presence of guided resonance makes this kind of structure more sensitive to the incident angle.

Recently, on the basis of the above work, the research group proposed a novel nanostructure with polarization-independent omnidirectional absorption. This kind of structure is mainly filled with high refractive index medium in the sub-wavelength metal grating on the metal substrate to increase the effective refractive index. Through theoretical analysis, it can be known that this kind of abnormal absorption originates from the surface plasmon coupling cavity mode. The structure has high absorption efficiency for both TE and TM polarizations, and the absorption rate is greater than 90% at an incident angle <60°. By adjusting the height absorption peak of the metal grating, the linear adjustment of the absorption wavelength in the visible light band can be realized, and the absorption rate can be kept above 99%. In the future, it will have broad application prospects in the integration of photodetectors and solar cells.

The research work was supported by the national "863" project and national key funds.

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