Ultra-broadband generalized M/I/M absorber for visible-near infrared band

A metamaterial perfect absorber for visible-near infrared broadband was proposed. The structure consists of four layers including reflective metal Ti layer, dielectric SiO2 layer, thin Ti layer, and the top single-sized Ti cylinder, which is named the generalized M/I/M absorber. We numerically studied the absorptivity of the absorber and achieved nearly perfect absorption via optimizing the structural parameters. Our Theoretical results show that (1) the maximum absorptivity in the high absorption window is as high as 99.96% over the wavelength range from 350~1400nm and the average absorptivity across the broadband was 98.21%. (2) this structure is insensitive to the incident angle of electromagnetic wave. We hope that such a device could be applied in solar energy absorption, thermal electronic equipment and perfect cloaking.

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