<p>This research article deals with the metamaterial based absorbers. The proposed metamaterial absorber is composed with three layers, top and bottom metallic layers of copper and a middle dielectric spacer in between them. The present studt discusses the multiband features of the designed metamaterial absorber. The proposed absorber could be very useful for millimeter-wave applications.</p>

The symmetry breaking structures has the ability to design meta-mirrors for numerous real-life applications. Hence, chiral structures has the ability to design meta-mirrors with circular dichroism for potential applications in chiral imaging, optical sensing and communications, etc. In this work, an L-shaped chiral structure is designed to achieve enhanced circular dichroism at multi-bands in near infrared regime (NIR). The meta-mirror so-called meta-reflector consists of an array of dielectric based L-type structures with different parameters, arranged in a periodic configuration. By properly choosing the material and the geometrical dimensions of the chosen structure, the obtained reflection spectra for left- and right-handed circularly polarized light is significantly different. As a result, the overall efficiency of the reflector enhanced by the chiral structure. This work can have significant application in optical chiral sensing, NIR spectroscopy, communication, etc.

<p>This research article deals with the metamaterial based absorbers. The proposed metamaterial absorber is composed with three layers, top and bottom metallic layers of copper and a middle dielectric spacer in between them. The present studt discusses the multiband features of the designed metamaterial absorber. The proposed absorber could be very useful for millimeter-wave applications.</p>

<p>This research article deals with the metamaterial based absorbers. The proposed metamaterial absorber is composed with three layers, top and bottom metallic layers of copper and a middle dielectric spacer in between them. The present studt discusses the multiband features of the designed metamaterial absorber. The proposed absorber could be very useful for millimeter-wave applications.</p>

Current and modern photovoltaics energy systems require miniaturized, ultrathin, compact and high efficiency absorbing and optical devices. So, by keeping these challenges in mind and inspired by the artificially engineered materials, called metamaterials, a high bandwidth optical nanostructured based absorbing device is presented in this report. The design geometry of the proposed nano-absorber comprises an array of nano-circular antennas, etched on a dielectric spacer, aluminium nitride (AlN) which is coated by a thick reflecting layer of silver from the backside. Surprisingly, the design absorber offers high absorption value of above 90% across the large operational wavelengths starting from 400 to 1500 nm. The constituting nano-antennas induces plasmonic resonance features, which enables the localized surface plasmon and results in an enhanced absorption. The nanoscale absorber is also investigated under the excitation of polarization and oblique incident angles of the incoming optical light. Finally, the plasmonic metal, tungsten (W) offers high melting point so that it can sustain under the high-energy photon particles. As compared to previous published work related to plasmonic absorbers, this work provide ultra-compact geometry, easily manufactured design, super bandwidth and polarization insensitivity. So, this can be used for the applications of thermophotovoltaics and energy harvesting etc.