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Broadband metamaterial-based near-infrared absorber using an array of uniformly placed gold resonators


Shobhit K. Patel, Juveriya Parmar, Devang Katrodiya, Truong Khang Nguyen*, Eldad Holdengreber, Vigneswaran Dhasarathan

Source title: 
Journal of the Optical Society of America B, 37(7): 2163-2170, 2020 (ISI)
Academic year of acceptance: 

Solar absorbers are designed for absorbing visible, infrared, and ultraviolet frequencies. Most of the absorbers designed so far have been for absorbing visible frequencies, and there is a strong need for designing infrared absorbers and ultraviolet absorbers. We present a broadband near-infrared absorber using metamaterial gold resonators. The gold resonators are uniformly placed over the SiO2 substrate in different patterns. All of these patterns’ solar absorbers are analyzed, and the results are presented in the form of reflection, transmission, absorption, electric field, permittivity, permeability, and refractive index. The parameter physical size is also varied, and results are observed in terms of reflection, absorption, and transmission. The optimized design is also obtained by analyzing all the design results. Comparative tables are also presented for all of these designs. The results are obtained for the near-infrared frequency range of 155 THz to 425 THz. The proposed uniform metamaterial absorber is applicable in photovoltaic applications and energy harvesting applications.