Jamal N. A. Hassan
Lithium Niobate Substrate with Holes: Lithium Niobate (LiNbO3) is a widely used material in photonics due to its excellent electro-optic and acousto-optic properties. However, introducing holes into the LiNbO3 substrate could potentially disrupt the propagation of light, leading to inefficient coupling and poor filter performance. The exact reasons can depend on the size, shape, and distribution of the holes, as well as the specific setup of your experiment. Silicon Rods in an Air Background: Silicon rods in an air background can form a type of structure known as a photonic crystal. Photonic crystals are periodic structures that can manipulate light in nanometer dimensions. The high refractive index contrast between silicon (which has a high refractive index) and air (which has a refractive index close to 1) can lead to strong field confinement and low bending loss. This makes them suitable for creating efficient add/drop filters.
The performance of an add/drop filter can be influenced by the materials used and their arrangement. Here’s some information that might help explain the phenomena you’re observing:
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