Abstract
We have designed a sphere-graphene-slab structure so that the electromagnetic wave can be well confined in the graphene due to the formation of a bound state in a continuum (BIC) of radiation modes. Based on such a bound state, we have realized strong optical absorption in the monolayer graphene. Such a strong optical absorption exhibits many advantages. It is ultrasensitive to the wavelength because the Q factor of the absorption peak can be more than 2000. By taking suitable BICs, the selective absorption for S and P waves has not only been realized, but also all-angle absorption for the S and P waves at the same time has been demonstrated. We have also found that ultrasensitive strong absorptions can appear at any wavelength from mid-infrared to far-infrared band. These phenomena are very beneficial to biosensing, perfect filters and waveguides.
Highlights
Ultrasensitive optical absorption in graphene based on bound states in the continuum Mingda Zhang1 & Xiangdong Zhang[2]
When the wavelength is taken between 15.25 mm and 19.25 mm, the angle dependent resonant absorption peaks only exist for the S wave, it is transparency for the P wave
Based on the bound state in a continuum (BIC), we have designed sphere-graphene-slab structures to improve the interaction between the EM wave and the graphene, and realize strong absorption of EM field in the monolayer graphene
Summary
We have designed a sphere-graphene-slab structure so that the electromagnetic wave can be well confined in the graphene due to the formation of a bound state in a continuum (BIC) of radiation modes Based on such a bound state, we have realized strong optical absorption in the monolayer graphene. It has recently been shown that it is in principle possible to ideally confine an optical mode within the radiation continuum, realizing an ideal optical bound state surrounded by symmetry-compatible radiation modes[21,22,23,24,25,26,27,28,29] Motivated by these investigations, in this work we combine the above two ways, and explore the possibility to realize strong absorption of graphene by using BICs
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