Related Experiment Video
Updated: Apr 27, 2026
10:35
Using Microwave and Macroscopic Samples of Dielectric Solids to Study the Photonic Properties of Disordered Photonic Bandgap Materials
Published on: September 26, 2014
11.2K
Simultaneous bandgaps in LiNbO3 phoxonic crystal slab
Optics Express
|July 1, 2014
Summary
Researchers explored simultaneous photonic and phononic crystal slabs in lithium niobate membranes. They found dual bandgaps in triangular lattices, crucial for integrated photonics and acoustics.
Area of Science:
- Materials Science
- Condensed Matter Physics
- Nanotechnology
Background:
- Photonic and phononic crystals offer unique wave manipulation properties.
- Lithium niobate is a key material for integrated optics and acousto-optics.
- Simultaneous control of light and sound waves is essential for advanced devices.
Purpose of the Study:
- To investigate simultaneous photonic and phononic bandgaps in Z-cut lithium niobate membranes.
- To analyze the influence of lattice geometry and physical parameters on bandgap formation.
- To identify conditions for dual bandgap existence in various lattice structures.
Main Methods:
- Utilized the three-dimensional finite element method (FEM) for bandgap analysis.
- Studied square, hexagonal, and honeycomb lattice structures.
- Varied geometrical parameters like hole radius and membrane thickness.
Main Results:
- Identified bandgaps for guided waves in photonic and phononic crystal slabs.
- Observed the evolution of bandgaps with changes in geometrical parameters.
- Demonstrated the existence of dual photonic and phononic bandgaps in triangular lattices under specific conditions.
Conclusions:
- Z-cut lithium niobate membranes support simultaneous photonic and phononic bandgaps.
- Triangular lattices show potential for dual bandgap applications with tailored geometry and modal symmetry.
- Findings are relevant for developing advanced integrated photonic and phononic devices.
Related Concept Videos
01:01Energy Bands in Solids
2.4K
Isolated atoms have discrete energy levels that are well described by the Bohr model. And, it quantifies the energy of an electron in a hydrogen atom as En. Higher quantum numbers 'n' yield less negative, closer electron energy levels.
Band Formation:
When atoms are brought close together, as in a solid, these discrete energy levels begin to split due to the overlap of electron orbitals from adjacent atoms. This split occurs because of the Pauli exclusion principle, which states...
Band Formation:
When atoms are brought close together, as in a solid, these discrete energy levels begin to split due to the overlap of electron orbitals from adjacent atoms. This split occurs because of the Pauli exclusion principle, which states...
2.4K
02:18X-ray Crystallography
21.5K
The size of the unit cell and the arrangement of atoms in a crystal may be determined from measurements of the diffraction of X-rays by the crystal, termed X-ray crystallography.
Diffraction
Diffraction is the change in the direction of travel experienced by an electromagnetic wave when it encounters a physical barrier whose dimensions are comparable to those of the wavelength of the light. X-rays are electromagnetic radiation with wavelengths about as long as the distance between neighboring...
Diffraction
Diffraction is the change in the direction of travel experienced by an electromagnetic wave when it encounters a physical barrier whose dimensions are comparable to those of the wavelength of the light. X-rays are electromagnetic radiation with wavelengths about as long as the distance between neighboring...
21.5K
02:35Band Theory
14.6K
When two or more atoms come together to form a molecule, their atomic orbitals combine and molecular orbitals of distinct energies result. In a solid, there are a large number of atoms, and therefore a large number of atomic orbitals that may be combined into molecular orbitals. These groups of molecular orbitals are so closely placed together to form continuous regions of energies, known as the bands.
The energy difference between these bands is known as the band gap.
Conductor, Semiconductor,...
The energy difference between these bands is known as the band gap.
Conductor, Semiconductor,...
14.6K
01:26Imperfections in Crystal Structure: Stoichiometric Point Defects
138
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...
138
01:25Imperfections in Crystal Structure: Point, Line and Plane Defects
146
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...
146
01:29Crystallographic Point Groups
124
Crystallographic point groups represent the various symmetry operations that can occur within crystals. They are unique in that at least one point will always remain unchanged during these actions. For instance, consider the triclinic system. This system, devoid of any axis or plane of symmetry, aligns with the C1 and Ci point groups.where Cᵢ is characterized solely by a center of inversion.Contrastingly, the monoclinic system introduces an element of symmetry. This system with one plane...
124