Diffuse Rear Reflector
Diffuse Rear Reflector - Related Videos
03:31
Diffusion and Osmosis - Concepts
0 Views •
2019
Cell Membranes and Diffusion In order to function, cells are required to move materials in and out of their cytoplasm via their cell membranes. These membranes are semipermeable, meaning that certain molecules are allowed to pass through, but not others. This movement of molecules is mediated by the phospholipid bilayer and its embedded proteins, some of which act as transport channels for molecules that otherwise would not be able to pass through the membrane, such as ions and carbohydrates.
08:18
Diffusion and Osmosis - Student Protocol
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2019
Diffusion in Agar ExpandNOTE: In this exercise, you will be given agar containing an indicator chemical called phenolphthalein. When phenolphthalein is exposed to the normal alkaline conditions in the agar, it will look pink. But when it is exposed to neutral or acidic conditions, it changes from pink to clear. You will make different size and shaped agar cubes as a model for cells to study the impact of cell size and shape on diffusion rate. To make the first set of cells, measure out and cut...
02:55
Diffusion and Osmosis - Instructor Prep
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2019
Preparation of Solutions for the Agar Cube Experiment ExpandIMPORTANT: Wear gloves, goggles, and appropriate personal protective equipment – chemicals can be hazardous at high concentrations. For the diffusion indicator solution, weigh out 1 g of phenolphthalein and add it to a beaker containing 100 mL of 95% ethanol. To make the basic solution for the agar, measure 80 mL of water into a beaker, and then add 0.4 g of NaOH. Stir until the solute is dissolved then bring the total volume of the...
13:03
Protocol for Mosquito Rearing (A. gambiae)
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Cited by 65 •
2007
This video illustrates the general techniques used to rear Anopheles gambiae in the laboratory. The methods for caring for laboratory mosquitoes are demonstrated through all stages of the organism's life cycle from larvae to pupae to blood-feeding adults.
01:21
Diffusion
0 Views •
2023
Diffusion is a type of passive transport. In passive transport, a substance tends to move from an area of high concentration to an area of low concentration until the concentration is equal across the space. For example, take the diffusion of substances through the air. When someone opens a perfume bottle in a room filled with people, the perfume is at its highest concentration in the bottle and is at its lowest at the edges of the room. The perfume vapor will diffuse, or spread away, from the...
FAQs
Its scattering surface redirects incident radiation toward the device’s front rather than allowing it to escape through the rear. Because the reflected light travels across multiple angles, it has a greater chance of interacting with an absorbing or emitting layer. This light-management effect can improve absorption, optical output, or collection efficiency, depending on the device.
Surface roughness, engineered texture, or embedded particles disrupts mirror-like reflection and spreads light in different directions. That angular distribution increases the opportunities for radiation to encounter functional layers instead of following a single reflected path. In engineering designs, the selected surface form therefore influences how effectively the structure redirects available light within the device.
Mirror-like reflection sends light in a more orderly direction, whereas diffuse reflection distributes it across multiple angles. For a rear reflector, this distinction affects whether redirected radiation remains available for interaction with the device’s active layers. The diffuse approach is useful when increasing the probability of absorption, emission, or collection is more important than preserving one dominant reflection direction.
The structure can affect several performance outcomes by controlling rear-surface optical losses. In solar cells, it may support more effective use of available radiation; in photodetectors, it can aid collection; and in LEDs, it can contribute to optical output. The specific benefit depends on whether the device primarily absorbs, detects, or emits light.
Applications include solar cells, photodetectors, LEDs, and other optoelectronic systems. Across these platforms, the reflector serves as a light-management element positioned at the rear of the device. Its role is to redirect radiation toward relevant front-side or internal layers, helping each system use available light more effectively rather than losing it through the rear surface.
Evaluation focuses on the device outcome that the reflector is intended to improve, such as absorption, optical output, or collection efficiency. Engineers can compare performance with and without the rear structure while considering the reflector’s rough, textured, or particle-based surface. This comparison links the optical redirection mechanism to measurable device-level improvements and rear-loss reduction.