Related Experiment Video
Updated: Jun 23, 2026
10:27
Simultaneous Multi-surface Anodizations and Stair-like Reverse Biases Detachment of Anodic Aluminum Oxides in Sulfuric and Oxalic Acid Electrolyte
Published on: October 5, 2017
Buried selectively-oxidized AlGaAs structures grown on nonplanar substrates
Optics Express
|May 20, 2009
Summary
Researchers developed a new buried oxide grating structure using selective oxidation of aluminum gallium arsenide (AlGaAs) on nonplanar substrates. This novel structure enables advanced semiconductor device fabrication, including resonant-cavity-enhanced photodetectors.
Area of Science:
- Materials Science
- Semiconductor Physics
- Optoelectronics
Background:
- Developing novel semiconductor structures is crucial for advancing optoelectronic devices.
- Selective oxidation of Aluminum Gallium Arsenide (AlGaAs) offers a pathway for creating integrated optical components.
- Nonplanar substrate growth allows for precise control over material composition and structure.
Purpose of the Study:
- To demonstrate a novel buried oxide grating structure for the first time.
- To utilize selective oxidation of AlGaAs on nonplanar substrates for device fabrication.
- To fabricate and characterize a resonant-cavity-enhanced photodetector incorporating the novel structure.
Main Methods:
- Low-pressure Metalorganic Chemical Vapor Deposition (MOCVD) on nonplanar substrates.
- Achieving localized aluminum content variation in AlGaAs.
- Selective oxidation of AlGaAs layers to form buried aluminum oxide.
- Fabrication of a resonant-cavity-enhanced photodetector.
Main Results:
- Successfully formed a novel buried oxide grating structure.
- Demonstrated localized aluminum content variation in AlGaAs via MOCVD on nonplanar substrates.
- Created a buried aluminum oxide/semiconductor distributed feedback structure.
- Fabricated and measured the responsivity spectrum of a resonant-cavity-enhanced photodetector.
Conclusions:
- The study successfully demonstrated a novel buried oxide grating structure using selective oxidation of AlGaAs on nonplanar substrates.
- This technique allows for the creation of integrated distributed feedback structures within semiconductor devices.
- The fabricated resonant-cavity-enhanced photodetector showcases the potential of this novel structure for optoelectronic applications.
Related Concept Videos
01:15Oxidations of Aldehydes and Ketones to Carboxylic Acids
Oxidation of aldehydes and ketones results in the formation of carboxylic acids. Aldehydes, bearing hydrogen next to the carbonyl group, are easily oxidized compared to ketones. This is because an aldehydic proton can easily be abstracted during oxidation.
Aldehydes readily undergo oxidation in strong oxidizing agents such as potassium permanganate and chromic acid. The oxidation can also be carried out using mild oxidizing agents such as silver oxide. In fact, aldehydes can be easily oxidized...
Aldehydes readily undergo oxidation in strong oxidizing agents such as potassium permanganate and chromic acid. The oxidation can also be carried out using mild oxidizing agents such as silver oxide. In fact, aldehydes can be easily oxidized...
01:25Microbial Mats
Microbial communities forming biofilms and mats represent complex, spatially structured ecosystems where metabolic processes are stratified according to light, oxygen, and nutrient gradients. Biofilms are initial colonization stages, only a few millimeters thick, while mature microbial mats can reach centimeter-scale thickness and display intricate vertical organization. Their structural and functional heterogeneity allows microorganisms to occupy distinct ecological niches within a few...
02:44Oxidation of Alkenes: Syn Dihydroxylation with Osmium Tetraoxide
Alkenes are converted to 1,2-diols or glycols through a process called dihydroxylation. It involves the addition of two hydroxyl groups across the double bond with two different stereochemical approaches, namely anti and syn. Dihydroxylation using osmium tetroxide progresses with syn stereochemistry.
01:30Anoxygenic Photosynthesis
Anoxygenic photosynthesis is a phototrophic process that captures light energy to drive carbon fixation without producing molecular oxygen. Unlike oxygenic photosynthesis, which utilizes water as an electron donor and releases oxygen, anoxygenic phototrophs use alternative electron donors such as hydrogen sulfide (H₂S), elemental sulfur (S⁰), or thiosulfate (S₂O₃²⁻). This process is carried out by diverse groups of bacteria, including purple bacteria, green sulfur bacteria, heliobacteria, and...
01:46Oxidative Cleavage of Alkenes: Ozonolysis
In ozonolysis, ozone is used to cleave a carbon–carbon double bond to form aldehydes and ketones, or carboxylic acids, depending on the work-up.
Ozone is a symmetrical bent molecule stabilized by a resonance structure.
Ozone is a symmetrical bent molecule stabilized by a resonance structure.
01:21Green Algae
Green algae, also referred to as chlorophytes, are different from red algae in having the chloroplasts containing chlorophylls a and b, which give them their distinct green hue. However, they lack phycobiliproteins, preventing them from developing the red or blue-green pigmentation seen in red algae. In terms of photosynthetic pigment composition, green algae closely resemble plants and share a close evolutionary relationship with them. Taxonomically Green algae belong to Phylum Chlorophyta in...