Electromagnetic metamaterials have emerged as a new class of effective media where exotic properties are determined from structural geometry and dimensions of the basic building blocks, or meta-atoms. Through such a bottom-up approach, metamaterials have found applications in the construction of terahertz functional devices and components with unprecedented performance. In this paper, we numeri...

Polymeric lenses have been increasingly used to replace glass due advantages of light weight, high refractive index, and ease making into complicated shapes. However, a severe constraint their wider application lies with intrinsic weakness in hardness that can lead mechanical damages by abrasion. During service, fogging remains another unsolved challenge optical lenses, which may significantly ...

In the paper, there are presented comprehensive noise characteristics (electrical and optical noise and correlation between electrical and optical fluctuations) investigations that were performed with the aim to clear up the reasons of short lifetime of laser diode (LD) and to find out LD design and fabrication features that can increase laser diode quality. Groups of different quality InGaAsP ...

A non-vacuum processing method for preparing polymer-based ZrO2/TiO2 multilayer structure antireflection coating (ARC) films for crystalline silicon solar cells by spin coating is introduced. Initially, ZrO2, TiO2 and surface deactivated-TiO2 (SD-TiO2) based films were examined separately and the effect of photocatalytic properties of TiO2 film on the reflectivity on silicon surface was investi...

It is necessary to study the optical properties of thin films to fabricate optoelectronic and interference devices. One of the methods in thin film preparation is the spray pyrolysis technique, which involves many technical aspects for the preparation of uniform coating. In the present study, Nickel Oxide (NiO) thin film is prepared by spray pyrolysis technique. NiO thin film was deposited usin...

Today multiand monocrystaline solar cells are typically wet-chemically textured and coated with a thin layer of silicon nitride to reduce losses due to light reflection and for electrical passivation of the silicon surface. In this paper we investigate a layer stack consisting of silicon nitride (SiNx:H) with a high refractive index at the silicon interface, an intermediate SiNx:H layer and on ...

A decade ago we introduced empirically derived formulas which allowed one to estimate the performance which can be achieved in the design of broad-band antireflection (AR) coatings based upon the indices of refraction ofthe materials to used, the bandwidth required, and the overall thickness of the coating. This has proved to be a useful tool to avoid attempting impossible designs and to guide ...

We propose an effective admittance (EA) method to design antireflection structures for two-dimensional photonic crystals (PCs). We demonstrate that a compact and efficient antireflection structure, which is difficult to obtain by the conventional admittance matching method, can be readily designed by the EA method. The antireflection structure consists of an air slot resonant cavity that is con...

We report on the design, simulation, fabrication, and characterization of a novel two layer anti-reflective coating (ARC) based on a plasmonic metamaterial and a dielectric. Promoted by the strong material dispersion of the plasmonic metamaterial, our novel concept (called hybrid ARC) combines two possible arrangements for layers in an anti-reflection coating into a single structure; albeit at ...