Optical Reflection
Optical Reflection - Related Videos
13:59
Reflection and Refraction
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2023
Source: Derek Wilson, Asantha Cooray, PhD, Department of Physics & Astronomy, School of Physical Sciences, University of California, Irvine, CA Light travels at different speeds depending on the material through which it is propagating. When light travels from one material to another, it will either slow down or speed up. In order to conserve energy and momentum, the light must change the direction in which it propagates. This bending of light is known as refraction. Some fraction of the...
08:30
Imaging Odor-Evoked Activities in the Mouse Olfactory Bulb using Optical Reflectance and Autofluorescence Signals
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Cited by 9 •
2011
This article presents the protocols of intrinsic optical signals and flavoproteins autofluorescence signals imaging to map odor-evoked activities at the surface of the olfactory bulb in mice.
09:25
Agarose-based Tissue Mimicking Optical Phantoms for Diffuse Reflectance Spectroscopy
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Cited by 32 •
2018
Here, we demonstrate how agarose-based tissue-mimicking optical phantoms are made and how their optical properties are determined using a conventional optical system with an integrating sphere.
08:31
Three-dimensional Optical-resolution Photoacoustic Microscopy
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Cited by 27 •
2011
Optical-resolution photoacoustic microscopy (OR-PAM) is an emerging technology capable of imaging optical absorption contrasts in vivo with cellular resolution and sensitivity. Here, we provide a visualized instruction on the experimental protocols of OR-PAM, including system configuration, system alignment, typical in vivo experimental procedures, and functional imaging schemes.
09:39
Optical Biosensing
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2023
Optical biosensors utilize light to detect the binding of a target molecule. These sensors can utilize a label molecule, which produces a measurable signal such as fluorescence, or these sensors can be label-free and use the changes in optical properties, such as refractive index, to sense for the binding of the target molecule. This video introduces both label and label-free optical biosensors, demonstrates their use in the laboratory, and shows some applications of the technology.
FAQs
A refractive-index change creates a boundary where part of the incoming electromagnetic wave can return toward the original medium. The size and direction of that returned component depend on the boundary and the angle at which light arrives. In optical measurements, these differences help distinguish interfaces and contribute to signals related to tissue structure.
A smooth surface preserves a more organized relationship between incoming and returned light, so the reflected signal is concentrated in particular directions. Surface roughness disrupts that organization and distributes light across multiple directions. This distinction matters in vision because directional brightness patterns and scattered light provide different information about surfaces, boundaries, and local texture.
The visual system receives light returned from surfaces rather than only light traveling directly from a source. Differences in the amount and distribution of returned light can produce variations in brightness and contrast across the visual scene. Those variations help the system detect surface features, allowing boundaries and other visual patterns to be distinguished.
An imaging approach directs light toward neural tissue and measures light returned from it. The recorded signal can be examined for information about tissue anatomy, activity-related changes, or broader brain structure. Reflection therefore serves as an optical measurement signal, linking the behavior of light at tissue boundaries with observations of the nervous system.
Returned light can provide information at several levels, including the anatomy of neural tissue, changes associated with activity, and features of brain structure. The value comes from relating measured optical signals to how tissue boundaries and surfaces redirect light. This makes reflection useful when researchers need nonidentical structural and activity-related information from optical observations.
These fields use the same returned-light phenomenon for different purposes. In visual neuroscience, reflected patterns help explain how brightness, contrast, and surface features are detected. In microscopy and related imaging, measured reflection provides observations of neural tissue and brain structure. Together, these applications connect basic light behavior with perception and experimental study of the brain.