Related Experiment Video
Updated: Mar 12, 2026

07:56
A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference
Published on: September 5, 2019
9.0K
Star-type polarizer with equal-power splitting function for each polarization based on polarization-dependent defects
Optics Express
|November 10, 2016
Summary
We developed a novel star-type polarizer using photonic-crystal waveguides (PCWs) and polarization-dependent defects (PDDs). This device splits light equally for each polarization, enabling advanced optical communication signal processing.
Area of Science:
- Optics and Photonics
- Materials Science
- Nanotechnology
Background:
- Photonic-crystal waveguides (PCWs) offer unique light manipulation capabilities.
- Polarization-dependent defects (PDDs) can be engineered to control light propagation.
- Efficient polarization splitters and equal-power dividers are crucial for optical communications.
Purpose of the Study:
- To propose and demonstrate a novel star-type polarizer with equal-power splitting functionality.
- To utilize polarization-dependent defects (PDDs) within two-dimensional photonic-crystal waveguides (PCWs).
- To enable simultaneous polarization control and power division for optical signal processing.
Main Methods:
- Design of a star-type structure by combining two Y-type PCWs.
- Introduction of two types of PDDs into the PCWs to achieve polarization selectivity.
- Utilizing the finite-element method (FEM) for simulation and parameter optimization.
- Wavelength scanning to evaluate operational bandwidth and transmission characteristics.
Main Results:
- Demonstrated that distinct polarizations transmit through separate PCWs with identical power distribution.
- Confirmed the device functions as both a polarizer and an equal-power splitter for each polarization.
- Showcased broadband operation with high output transmission for both TE and TM polarizations across a wide wavelength range.
Conclusions:
- The proposed star-type polarizer based on PDDs in PCWs offers simultaneous polarization splitting and equal-power division.
- This device is suitable for polarization-relative multi-channel signal processing in optical communications.
- Potential applications exist in the mid- and far-infrared wavelength regions, enhancing optical network capabilities.
Related Concept Videos
Imperfections in Crystal Structure: Point, Line and Plane Defects
33
A perfect crystal, in theory, has a uniform structure with the same unit cell and lattice points throughout. However, any deviation from this periodic arrangement is known as an imperfection or defect. These defects can be categorized into three types: point, line, and plane defects.Point defects occur when there is a deviation from the ideal due to missing atoms, displaced atoms, or additional atoms. These imperfections might occur due to imperfect packing during crystallization or because of...
33
Dielectric Polarization in a Capacitor
6.3K
The presence of a dielectric medium in a capacitor not only changes the voltage and capacitance but also affects the electric field. In general, dielectrics can be of two types: polar and nonpolar. In a polar dielectric, the positive and negative charges in the molecules are separated by a distance and hence have a permanent dipole moment. In contrast, no such charge separation exists in a nonpolar dielectric, however the nonpolar molecules get polarized in the presence of an external electric...
6.3K
Potential Due to a Polarized Object
880
A neutral atom consists of a positively charged nucleus surrounded by a negatively charged electron cloud. When placed in an external electric field, the external electric force pulls the electrons and nucleus apart, opposite to the intrinsic attraction between the nucleus and the electrons. The opposing forces balance each other with a slight shift between the center of masses of the nucleus and the electron cloud, resulting in a polarized atom. On the other hand, a few molecules, like water,...
880
Imperfections in Crystal Structure: Stoichiometric Point Defects
39
Schottky defects arise when some lattice points in a crystal, such as those in NaCl, remain unoccupied, creating lattice vacancies without disturbing the overall electrical neutrality of the crystal. This defect is common in ionic crystals where the positive and negative ions are similar in size, as seen in sodium chloride and cesium chloride. The presence of Schottky defects enables the crystal to conduct electricity to a small extent through an ionic mechanism. Electric fields cause nearby...
39

