title: Ultrasensitive optical absorption in graphene based on bound states in the continuum.
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.
authors: Department of Physics, Beijing Normal University, Beijing 100875, China.
authors: Mingda
authors: M
authors: Zhang
authors: School of Physics and Beijing Key Laboratory of Nanophotonics &Ultrafine Optoelectronic Systems, Beijing Institute of Technology, 100081, Beijing, China.
authors: Xiangdong
authors: X
authors: Zhang
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