In this study, we model and compare the performance for several different metal wire-grid polarizers over the visible
spectrum using rigorous coupled wave analysis and determine that the best choice for the wire material is aluminum.
However, a layer of Al203 forms rapidly on the aluminum wires even in high vacuum. The effect of metal oxide layers
forming on the wires is also modeled. It is shown that the actual oxide layer forming on the wires has only a small effect
on the performance of the polarizers. With the oxide layers coated on the wire, the transmission coefficient is nearly
invariable, extinction ratio slightly decreases. Next, the polarization properties are considered with changes in the
physical parameters, including period, metal height, duty cycle, and angle of incidence. The results show that aluminum
wire-grid polarizer has high transmission coefficient and extinction ratio over visible spectrum, as well as uniform
performance with wide variations in the angle of incidence. These features with their small form factor make it desirable
for use in field-of-view and allow more compact component designs.
In this study, we propose a high-performance polarizer with Aluminum wire-grid structure that an antireflection layer
(AR) is deposited between the metal wires and the transparent substrate. The polarization properties of the polarizer are
analyzed in detail using rigorous coupled wave analysis (RCWA). The theoretical research shows that aluminum wire-grid
polarizer has high transmission coefficient and extinction ratio in near infrared, as well as uniform performance with
wide variations in the angle of incidence. For the fiber communication window of 1550nm, the transmittance and the
extinction ratio are 95.4% and 35.3dB, respectively. Furthermore, a layer of Al203 forms rapidly on the aluminum wires
even in high vacuum, the effect of the metal oxide layers on the polarization properties is modeled and analyzed. The
results have shown that the polarizer with oxide layers coating on the wires still provides high performance. These
features with their small form factor make it has potential for use in many integrated optical applications.
We propose a novel broadband polarizing beam splitter with an embedded metal-wire nanograting structure that the
metal wire is deposited in the grating trenches. This embedded structure makes the grating more firms in its applications.
The design is based on Effective Medium Theory (EMT) and the structure is optimized with Rigorous Coupled Wave
Theory (RCWA). The design results show that the polarizing beam splitter has uniform performance with wide variations in the angle of incidence and has low insertion loss, high polarization extinction ratio in a broad spectral range.
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