Related Experiment Video
Updated: Jan 22, 2026
07:56
A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference
Published on: September 5, 2019
8.9K
Strain modulated nanostructure patterned AlGaN-based deep ultraviolet multiple-quantum-wells for polarization control
Houqiang Xu1,2, Hanling Long3, Jie'an Jiang1,2,4
1Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo, 315201, Zhejiang, People's Republic of China.
Nanotechnology
|July 16, 2019
Summary
Strain-modulated nanostructures in deep ultraviolet (DUV) multiple-quantum-wells (MQWs) significantly boost light emission and polarization. Compressive strain further enhances performance, promising efficient DUV optoelectronic devices.
Area of Science:
- Materials Science
- Optoelectronics
- Solid State Physics
Background:
- AlGaN-based deep ultraviolet (DUV) multiple-quantum-wells (MQWs) are crucial for optoelectronic devices.
- Enhancing light extraction efficiency (LEE) and degree of polarization (DOP) remains a key challenge.
Purpose of the Study:
- To investigate the impact of strain-modulated nanostructures on the optical properties of AlGaN-based DUV-MQWs.
- To optimize DUV-MQWs for improved LEE and DOP, particularly for transverse electric (TE) mode emission.
Main Methods:
- Fabrication of strain-modulated nanostructure patterned DUV-MQWs.
- Experimental examination of optical behaviors, including photoluminescence, DOP, and LEE.
- Analysis of the influence of Al composition and biaxial strains (compressive and tensile).
Main Results:
- Nanostructure patterned MQWs exhibited three times higher photoluminescence compared to planar structures.
- Significant improvement in DOP, from -0.43 to -0.16, was observed.
- Compressive strains in nanostructure patterned MQWs led to higher DOP and LEE than tensile strains, facilitating TE mode emission.
Conclusions:
- The combination of compressive in-plane strain and surface nanostructures offers a novel approach for enhancing TE mode emission in DUV-MQWs.
- This strategy demonstrates significant advantages for the design and optimization of highly efficient polarized DUV optoelectronic devices.
Related Concept Videos
02:43Quantum Numbers
49.4K
It is said that the energy of an electron in an atom is quantized; that is, it can be equal only to certain specific values and can jump from one energy level to another but not transition smoothly or stay between these levels.
49.4K
01:13¹H NMR Signal Multiplicity: Splitting Patterns
6.5K
When protons A and X are coupled, their nuclear spin energy levels are slightly modified. This is because the energy required to excite proton A to a spin state parallel to proton X is slightly different from the energy required for it to become anti-parallel to spin X. Consequently, there are two possible excitation frequencies for A (A1 and A2), depending on the spin state of X, and vice versa. The mutual nature of coupling implies that the difference between frequencies A1 and A2, indicated...
6.5K
01:15Insensitive Nuclei Enhanced by Polarization Transfer (INEPT)
1.0K
Insensitive Nuclei Enhanced by Polarization Transfer (INEPT) is an advanced Nuclear Magnetic Resonance (NMR) technique specifically designed to detect and enhance the signals of low-abundance nuclei, such as carbon-13 and nitrogen-15, in small molecules. The fundamental principle behind INEPT is the transfer of polarization from a more abundant and highly polarizable nucleus, typically hydrogen-1, to the low-abundance nucleus of interest. This process effectively boosts the NMR signal of the...
1.0K
01:20¹³C NMR: Distortionless Enhancement by Polarization Transfer (DEPT)
1.6K
When proton-coupled carbon-13 spectra are simplified by a broadband proton decoupling technique, structural information about the coupled protons is lost. Distortionless enhancement by polarization transfer (DEPT) is a technique that provides information on the number of hydrogens attached to each carbon in a molecule. While the DEPT experiment utilizes complex pulse sequences, the pulse delay and flip angle are specifically manipulated. The resulting signals have different phases depending on...
1.6K
02:45The Quantum-Mechanical Model of an Atom
56.7K
Shortly after de Broglie published his ideas that the electron in a hydrogen atom could be better thought of as being a circular standing wave instead of a particle moving in quantized circular orbits, Erwin Schrödinger extended de Broglie’s work by deriving what is now known as the Schrödinger equation. When Schrödinger applied his equation to hydrogen-like atoms, he was able to reproduce Bohr’s expression for the energy and, thus, the Rydberg formula governing hydrogen spectra.
56.7K
01:01Group Polarization
38.4K
Group polarization is the strengthening of an original group attitude following the discussion of views within a group (Teger & Pruitt, 1967). That is, if a group initially favors a viewpoint, after discussion the group consensus is likely a stronger endorsement of the viewpoint. Conversely, if the group was initially opposed to a viewpoint, group discussion would likely lead to stronger opposition.
38.4K