PHOTONIC DEVICE

摘要

The present invention relates to an optical element. According to an embodiment of the present invention, the optical element comprises: a first layer including a first material and having a first bandgap; and a second layer stacked on one surface or both sides of the first layer, including the first material, and having a second bandgap different from the first bandgap. The present invention uses a method which adjusts porosity of the same material to adjust unique bandgap energy that the material has. The feature is checked even in a polycrystalline or amorphous material, not a single crystalline material so that the present invention can be applied to a variety of optical elements.