Near-infrared transparent conducting metal based on impedance matching plasmonic nanostructures

Here we present an alternative approach to design a free-standing transparent conducting device for wide-angle and polarization-insensitive incidence of electromagnetic waves at near-infrared frequencies. The targeted system is realized by depositing periodic metallic patches on the top and the bottom of a continuous metal film. Based on the optimization of structure parameters, the whole system can suppress the reflection and enhance the transmission. The obtained high transmission of the designed system under the condition of effective medium limit can be attributed to the impedance matching to the vacuum. This device may be useful in applications, such as optoelectronic electrodes and micro-electronic displays, where both high electrical conductivity and high optical transmittance are desirable.