Optical Properties
Optical Properties - Related Videos
02:24
Properties of Enantiomers and Optical Activity
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2023
It is essential to understand the difference between chiral and achiral interactions and the implications thereof in optical activity and their applications. Just as our feet, which are chiral, interact uniquely with chiral objects, such as a pair of shoes, but identically with achiral socks, enantiomers of a molecule exhibit different properties only when they interact with other chiral media. An example of a significant implication from this facet is the phenomenon known as optical activity,...
10:21
Evanescent Field Based Photoacoustics: Optical Property Evaluation at Surfaces
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Cited by 2 •
2016
Here we present a protocol to estimate material and surface optical properties using the photoacoustic effect combined with total internal reflection. This technique evanescent field-based photoacoustics can be used to create a photoacoustic metrology system to estimate materials' thicknesses, bulk and thin film refractive indices, and explore their optical properties.
04:51
Quantifying Elastic Properties of Environmental Biofilms using Optical Coherence Elastography
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2024
This paper highlights the optical coherence elastography (OCE) technique's efficacy in rapidly and non-destructively characterizing biofilm elastic properties. We elucidate critical OCE implementation procedures for accurate measurements and present Young's modulus values for two granular biofilms.
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
Wavelength determines which light interactions become prominent, while refractive index influences how light propagates through a sample and changes direction at material boundaries. Together with molecular structure, these variables affect the balance of absorption, reflection, transmission, scattering, and emission. Controlling or interpreting them helps investigators relate measured signals to tissue composition and organization.
Absorption and scattering represent different interaction pathways that can produce distinct measurement signals. Their combined effects influence whether an instrument records transmitted, reflected, or redistributed light from a sample. Separating these contributions improves interpretation of tissue measurements and helps explain why differences in tissue organization affect optical contrast and image formation.
Molecular structure can alter how a material responds to particular wavelengths, while tissue organization influences the paths light takes through a biological sample. Consequently, changes in composition or architecture may modify the measured combination of absorption, reflection, transmission, scattering, or emission. This relationship makes optical measurements useful for characterizing tissues and tracking medically relevant differences.
The choice depends on the information sought and the sample or tissue being examined. Spectroscopy can characterize wavelength-dependent behavior, microscopy can reveal optical features at microscopic scales, optical coherence tomography can support image formation, and fluorescence imaging can capture emitted light. Matching the technique to the desired signal helps convert optical behavior into structural or compositional information.
Investigators examine how a sample absorbs, reflects, transmits, scatters, or emits light, then interpret those signals in relation to refractive index, wavelength, molecular structure, and tissue organization. The resulting measurements can support noninvasive characterization of biological tissues and blood. Interpretation is strongest when the observed optical response is linked to a relevant structural or compositional factor.
Optical measurements support noninvasive diagnosis and disease monitoring, while knowledge of tissue responses also guides light-based treatment design. Phototherapy and targeted laser procedures are examples identified in medicine. In these settings, understanding how tissues interact with light helps investigators develop optical strategies that provide useful diagnostic information or support treatment directed at an intended biological target.