Design method for large-bandwidth strong-absorption metamaterial near-infrared wave-absorbing material
A wave-absorbing material and design method technology, applied in optical components, optics, instruments, etc., can solve problems such as narrow absorption bandwidth and limit the application of devices, and achieve the effects of rapid production, widening absorption bandwidth, and improving conversion efficiency
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[0029] The present invention will be further described below in conjunction with drawings and embodiments.
[0030] Such as figure 1 , figure 2 As shown, the metamaterial near-infrared absorbing material is composed of periodic unit structures. Each unit structure is composed of three layers of different materials, each of which has a thickness much smaller than the wavelength. Specifically, a layer of gold film with a thickness of about 100nm is set on the silicon substrate to suppress the transmission of light; on the gold film is a continuous silicon dioxide film with a thickness of 160nm; the uppermost layer is made of metal titanium The resonant disc has a diameter of 400nm and a thickness of 30nm. Among them, the refractive index of silicon dioxide in the near infrared is about 1.45, and the dielectric constant of metal titanium is represented by the Drude model. The plasma frequency of gold is 1.366×10 16 Hz, the collision frequency is 1.2×10 14 Hz; the plasma fr...
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