Narrow Results

We investigate second harmonic generation (SHG) in one-dimensional (1D) ferroelectric-metallic photonic crystals (PCs) which are composed of alternatively inverting poled ferroelectric domains with metallic insert layers. We observe a giant enhancement of SHG conversion efficiency due to high reflectivity of metallic layers, which form resonant cavities and lead to substantial increase of fundamental wave (FW) field in nonlinear medium layers.

In this paper, a new ultra-compact optical biosensor based on photonic crystal (phc) resonant cavity is proposed. This sensor has ability to work in chemical optical processes for the determination and analysis of liquid material. Here, we used an optical filter based on two-dimensional phc resonant cavity on a silicon layer and an active area is created in center of cavity. According to results, with increasing the refractive index of cavity, resonant wavelengths shift so that this phenomenon provides the ability to measure the properties of materials. This novel designed biosensor has more advantage to operate in the biochemical process for example sensing protein and DNA molecule refractive index. This nanoscale biosensor has quality factor higher than 1.5 × 10⁴ and it is suitable to be used in the home healthcare diagnostic applications.