Optical Detection
Optical Detection - Related Videos
10:21
Multicolor Fluorescence Detection for Droplet Microfluidics Using Optical Fibers
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Cited by 18 •
2016
Multicolor fluorescence detection in droplet microfluidics typically involves bulky and complex epifluorescence microscope-based detection systems. Here we describe a compact and modular multicolor detection scheme that utilizes an array of optical fibers to temporally encode multicolor data collected by a single photodetector.
08:53
Label-free Single Molecule Detection Using Microtoroid Optical Resonators
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Cited by 32 •
2015
We have developed a label-free biosensing system based on optical resonator technology known as Frequency Locking Optical Whispering Evanescent Resonator (FLOWER) that is capable of detecting single molecules in solution. Here the procedures behind this work are described and presented.
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.
10:59
Use of Label-free Optical Biosensors to Detect Modulation of Potassium Channels by G-protein Coupled Receptors
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Cited by 5 •
2014
Optical biosensor techniques can detect changes in mass near the plasma membrane in living cells and allow one to follow cellular responses in both individual cells and populations of cells. This protocol will describe detection of the modulation of potassium channels by G-protein coupled receptors in intact cells using this approach.
07:19
Microfluidic Imaging Flow Cytometry by Asymmetric-detection Time-stretch Optical Microscopy (ATOM)
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Cited by 5 •
2017
This protocol describes the implementation of an asymmetric-detection time-stretch optical microscopy system for single-cell imaging in ultrafast microfluidic flow and its applications in imaging flow cytometry.
FAQs
Each light response reports a different interaction between the sample and light. Absorption can indicate how much light a material removes, emission can reveal light released by a sample, and scattering can show how structures redirect light. Comparing these responses helps researchers choose a measurement suited to locating structures, tracking events, or quantifying biological changes.
The detector captures the light response produced by the sample and converts it into measurable data. That data can then be analyzed to determine signal intensity, location, or changes associated with a biological event. Detector output therefore connects the physical optical interaction to interpretable measurements used in microscopy, assays, biosensors, and imaging.
Fluorescence-based assays and imaging methods use emitted light to provide readouts from biological samples. These signals can help reveal cell structures or indicate molecular interactions that are difficult to assess from the sample alone. In biology, fluorescence therefore supports both spatial observation and measurement of biochemical activity, including changes occurring in living systems.
The useful signal depends on how the sample changes light and on whether the resulting response can be measured and interpreted. Absorption, emission, scattering, or another optical change may provide the relevant contrast. The intended outcome, such as locating material, quantifying activity, or tracking a process, guides which response and measurement approach are most appropriate.
A general workflow begins by selecting the biological event or material to study, then identifying the relevant light response, such as absorption, emission, scattering, or another optical change. The sample is measured with an appropriate optical setup and detector, and the recorded signal is analyzed for location, quantity, or change over time.
The choice depends on the information required from the sample. Microscopy can support observation of cell structures, fluorescence assays can provide biochemical or interaction-related readouts, biosensors can support detection of biological changes, and imaging methods can reveal events across a sample. These approaches extend optical detection from focused measurements to broader biological observation.
Because it can provide sensitive and often noninvasive readouts, optical detection can follow biological activity while a living system changes. Measurements may reveal molecular interactions, biochemical activity, or alterations in cell structures. This capacity makes optical approaches useful when researchers need information about processes as they occur rather than only a final endpoint.
Beyond laboratory observation, optical detection contributes to diagnostics, environmental monitoring, and biomedical research. Its measurements can help identify or quantify materials and biological events, while imaging and biosensing approaches provide context about where changes occur. The same underlying optical readouts can therefore support both fundamental studies and tools intended for practical biological assessment.