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The coating material combination used was germanium as high index material and IR-F625 as low index material.
The sensor was designed on the basis of a negative index material (NIM) lens.
We note that, in practice, it is very challenging to open a photonic bandgap using a low refractive index material and a 2D cavity geometry.
The deposition of graded-index layers and rugate structures was performed by coevaporation of silicon dioxide as the low index material and niobium pentoxide as the high index material.
LaF3 and MgF2 are chosen as high and low index material to design the low polarization anti-reflection (LPAR) coating.
A number of engineering parameters such as Concentration Index, Material Index, Density Gradient, and Stress Ratios are calculated.
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Both high-index materials and low-index material were analyzed.
Based on a (HLL 9H design comprising of quarter-waves of high-index material and half-waves of low-index material, we obtain an optimum MLD coating meeting these requirements by inserting a matching layer being half a quarter-wave of Al2O3 between the initial design and an optimized HfO2 top layer.
In CMOS-compatible optical filter designs, SiO2 is often used as the low-index material, limiting the optical contrast (nHi/nLo) to about 2. Using the air as low-index material improves the optical contrast by about 50%, thus increasing the reflectivity and bandwidth at a given design complexity.
In this way, they were able to make Veselago's fabled negative-index material a reality.
Veselago further demonstrated that a negative-index material would have startling and counterintuitive properties unlike anything found in nature.
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