Related Experiment Video
Updated: Jan 31, 2026
09:46
Direct Comparison of Hyperspectral Stimulated Raman Scattering and Coherent Anti-Stokes Raman Scattering Microscopy for Chemical Imaging
Published on: April 28, 2022
4.8K
Selective suppression of CARS signal with two competing stimulated Raman scattering processes
B Jayachander Rao1, Dae Sik Choi2, Minhaeng Cho1
1Center for Molecular Spectroscopy and Dynamics, Institute for Basic Science, Seoul 02841, South Korea.
The Journal of Chemical Physics
|December 24, 2018
Summary
Researchers developed new methods to selectively suppress Coherent Anti-Stokes Raman Scattering (CARS) signals. These techniques are crucial for achieving super-resolution CARS microscopy, overcoming current spatial resolution limits.
Area of Science:
- Spectroscopy
- Microscopy
- Chemical Physics
Background:
- Coherent Anti-Stokes Raman Scattering (CARS) microscopy is valuable for analyzing chemical and biological systems.
- Its spatial resolution is limited by the diffraction barrier, hindering super-resolution applications.
Purpose of the Study:
- To present theoretical descriptions of three methods for selectively suppressing CARS signals.
- To enable super-resolution CARS microscopy by overcoming diffraction limits.
Main Methods:
- Utilized three-beam double stimulated Raman scattering (SRS) schemes.
- Employed semiclassical theory to derive coupled differential equations for field intensities.
- Obtained approximate solutions to analyze signal suppression.
Main Results:
- Demonstrated selective suppression of pump-Stokes-pump CARS signal by increasing depletion beam intensity.
- Showed that simultaneous induction of two SRS processes enables signal switching.
- Calculated point spread function to confirm super-resolution potential.
Conclusions:
- Proposed selective CARS suppression schemes are effective for super-resolution imaging.
- These methods can advance label-free CARS microscopy.
- The findings pave the way for enhanced spatial resolution in CARS applications.
Related Concept Videos
01:32What is Natural Selection?
129.0K
Natural selection is an evolutionary process in which individuals with survival-promoting traits reproduce at higher rates. These favorable traits become more common within a population or species. Naturally selected traits initially arise via random genetic mutations. In order for selection to occur, there must be variation within a population, the trait controlling the variation must be heritable, and there must be an evolutionary advantage for variation in the trait.
129.0K
01:15Scatter Plot
11.3K
The most common and easiest way to display the relationship between two variables, x and y, is a scatter plot. A scatter plot shows the direction of a relationship between the variables. A clear direction happens when there is either:
11.3K
01:20Raman Spectroscopy: Overview
1.8K
The underlying principle of Raman spectroscopy is based on the interaction between light and matter, specifically molecules' inelastic scattering of photons. When a monochromatic beam of light, typically from a laser source, interacts with a sample, most scattered light has the same frequency as the incident light. This is known as Rayleigh scattering.
However, a small fraction of the scattered light exhibits a frequency shift due to the exchange of energy between the incident photons and...
However, a small fraction of the scattered light exhibits a frequency shift due to the exchange of energy between the incident photons and...
1.8K
02:03What is Cell Signaling?
130.4K
Despite the protective membrane that separates a cell from the environment, cells need the ability to detect and respond to environmental changes. Additionally, cells often need to communicate with one another. Unicellular and multicellular organisms use a variety of cell signaling mechanisms to communicate to respond to the environment.
130.4K
01:24Intracellular Signaling Cascades
53.5K
Once a ligand binds to a receptor, the signal is transmitted through the membrane and into the cytoplasm. The continuation of a signal in this manner is called signal transduction. Signal transduction only occurs with cell-surface receptors, which cannot interact with most components of the cell, such as DNA. Only internal receptors can interact directly with DNA in the nucleus to initiate protein synthesis. When a ligand binds to its receptor, conformational changes occur that affect the...
53.5K
01:30Bacterial Signaling
40.7K
Bacterial signaling can occur within bacteria (intracellular) or between bacteria (intercellular). At times, a group of bacteria behaves like a community. To achieve this, they engage in quorum sensing, the perception of higher cell density that causes changes in gene expression. Quorum sensing involves both extracellular and intracellular signaling. The signaling cascade starts with a molecule called an autoinducer (AI). Individual bacteria produce AIs that move out of the bacterial cell...
40.7K