Related Experiment Video
Updated: May 3, 2026
11:08
Fabrication And Characterization Of Photonic Crystal Slow Light Waveguides And Cavities
Published on: November 30, 2012
18.9K
Three-Dimensional Reconfigurable Optical Singularities in Bilayer Photonic Crystals
Xueqi Ni1, Yuan Liu1, Beicheng Lou2
1School of Engineering and Applied Sciences, Harvard University, Cambridge, Massachusetts 02138, USA.
Physical Review Letters
|March 1, 2024
Summary
Tunable bilayer photonic crystals enable dynamic control over light polarization and phase singularities. This breakthrough advances optical devices for ultrafast optics, optoelectronics, and quantum applications.
Area of Science:
- Photonics and optical engineering.
- Nanophotonics and metamaterials.
- Quantum optics and optoelectronics.
Background:
- Metasurfaces and photonic crystals offer light manipulation but lack reconfigurability.
- Dynamic control of optical singularities (phase and polarization) is crucial for advanced applications.
- Tunable bilayer photonic crystals (BPhCs) present a promising platform for reconfigurable light control.
Purpose of the Study:
- To explore the potential of tunable BPhCs for dynamic manipulation of optical singularities.
- To demonstrate the control of polarization and phase singularities using silicon nitride-based BPhCs.
- To investigate the application of tunable singularities in modulating optical phenomena like bound states and resonances.
Main Methods:
- Fabrication of silicon nitride-based bilayer photonic crystals.
- Experimental demonstration of tunable bidirectional and unidirectional polarization singularities.
- Observation of spatiotemporal phase singularities.
- Dynamic modulation of bound-state-in-continuum states and unidirectional guided resonances.
- Control of longitudinal and transverse orbital angular momentum.
Main Results:
- Demonstrated tunable polarization singularities (bidirectional and unidirectional).
- Achieved dynamic control over spatiotemporal phase singularities.
- Successfully modulated bound-state-in-continuum states and unidirectional guided resonances.
- Showcased control over both longitudinal and transverse orbital angular momentum.
Conclusions:
- Tunable BPhCs offer unprecedented multidimensional control over light polarization and phase.
- This reconfigurability opens new avenues for dynamic optical devices.
- The findings inspire advancements in ultrafast optics, optoelectronics, and quantum optics.
More Related Videos
10:35Using Microwave and Macroscopic Samples of Dielectric Solids to Study the Photonic Properties of Disordered Photonic Bandgap Materials
Published on: September 26, 2014
12.3K
08:01Spectral and Angle-Resolved Magneto-Optical Characterization of Photonic Nanostructures
Published on: November 21, 2019
7.1K
Related Concept Videos
01:18Unit Cells
126
A crystal's internal structure is an orderly array of atoms, ions, or molecules, and the details of this array significantly influence the solid's properties. In a crystal, periodically repeating 'structural motifs' - which could be atoms, molecules, or groups thereof - create a 'space lattice.' This is essentially a three-dimensional, infinite array of points, each surrounded by its neighbors in an identical way, forming the basic structure of the crystal.A 'unit cell' is a theoretical...
126
01:29Determination of Crystal Structures
135
In the late 1800s, the revelation that light extended beyond visible wavelengths led to the discovery of X-rays by Wilhelm Roentgen. Recognized as high-energy electromagnetic radiation with short wavelengths, X-rays prompted exploration into their interaction with crystals. Max von Laue proposed in 1912 that the periodic arrangement of atoms, ions, or molecules in crystals would cause them to diffract X-rays, a hypothesis confirmed through experiments with copper sulfate and zinc sulfide...
135
01:25Imperfections in Crystal Structure: Point, Line and Plane Defects
150
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...
150
01:26Imperfections in Crystal Structure: Stoichiometric Point Defects
143
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...
143
01:29Imperfections in Crystal Structure: Non-Stoichiometric Defects
115
Non-stoichiometric defects refer to a type of defect in the crystal structure of a compound where the ratio of its constituent elements deviates from the ideal stoichiometric ratio. There are two main types of non-stoichiometric defects: metal excess defects and metal deficiency defects.Metal excess defects occur when there is a slight surplus of metal ions than what is required by the stoichiometric ratio of the compound. For example, heating a sodium chloride crystal in sodium vapor results...
115
01:28Three-Dimensional Microscopy in Microbiology
907
Three-dimensional imaging techniques are essential in cell biology, allowing researchers to visualize intricate cellular structures with high resolution. Two prominent methods, Differential Interference Contrast Microscopy (DIC) and Confocal Scanning Laser Microscopy (CSLM), provide distinct advantages for imaging live and thick specimens, respectively.Differential Interference Contrast MicroscopyDIC microscopy enhances contrast in transparent, unstained samples by converting phase...
907